<XBRL>
<?xml version="1.0" encoding="us-ascii"?>
<!--Generated by EDGARfilings PROfile 4.3.3.1 Broadridge-->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:t1="http://xbrl.org/2005/xbrldt">
  <link:roleRef roleURI="http://atlanticayield.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#SubsequentEventsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/EarningsPerShareDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#EarningsPerShareDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/OtherOperatingExpensesDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#OtherOperatingExpensesDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialIncomeAndExpensesDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialIncomeAndExpensesDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/IncomeTaxDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#IncomeTaxDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/TradePayablesAndOtherCurrentLiabilitiesDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#TradePayablesAndOtherCurrentLiabilitiesDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/GrantsAndOtherLiabilitiesDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#GrantsAndOtherLiabilitiesDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ProjectDebtRepaymentScheduleDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#ProjectDebtRepaymentScheduleDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ProjectDebtDetailsOfProjectDebtDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#ProjectDebtDetailsOfProjectDebtDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/CorporateDebtDetailsOfCorporateDebtDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#CorporateDebtDetailsOfCorporateDebtDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/CorporateDebtRepaymentScheduleDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#CorporateDebtRepaymentScheduleDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/CorporateDebtBreakdownOfCorporateDebtDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#CorporateDebtBreakdownOfCorporateDebtDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/EquityDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#EquityDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ClientsAndOtherReceivableDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#ClientsAndOtherReceivableDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/RelatedPartiesDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#RelatedPartiesDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/DerivativeFinancialInstrumentsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#DerivativeFinancialInstrumentsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInvestmentsRestructuringAgreementOfAbengoaDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInvestmentsRestructuringAgreementOfAbengoaDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInvestmentsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInvestmentsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/InvestmentsCarriedUnderEquityMethodDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#InvestmentsCarriedUnderEquityMethodDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ContractedConcessionalAssetsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#ContractedConcessionalAssetsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ChangesInScopeOfConsolidatedCondensedInterimFinancialStatementsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#ChangesInScopeOfConsolidatedCondensedInterimFinancialStatementsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegmentDepreciationAmortizationAndImpairmentChargesRecognizedDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegmentDepreciationAmortizationAndImpairmentChargesRecognizedDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegmentAssetsAndLiabilitiesByBusinessSectorsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegmentAssetsAndLiabilitiesByBusinessSectorsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegmentAssetsAndLiabilitiesByGeographyDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegmentAssetsAndLiabilitiesByGeographyDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegmentReconciliationOfSegmentFurtherAdjustedEbitdaDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegmentReconciliationOfSegmentFurtherAdjustedEbitdaDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegmentRevenuesAndFurtherAdjustedEbitdaDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegmentRevenuesAndFurtherAdjustedEbitdaDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegmentBusinessSectorsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegmentBusinessSectorsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/BasisOfPreparationDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#BasisOfPreparationDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/NatureOfBusinessFinancingArrangementsDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#NatureOfBusinessFinancingArrangementsDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/NatureOfBusinessConcessionalAssetsOwnedDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#NatureOfBusinessConcessionalAssetsOwnedDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/NatureOfBusinessAssetsAcquiredDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#NatureOfBusinessAssetsAcquiredDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/NatureOfBusinessDescriptionDetails" xlink:type="simple" xlink:href="aby-20180331.xsd#NatureOfBusinessDescriptionDetails" />
  <link:roleRef roleURI="http://atlanticayield.com/role/EarningsPerShareTables" xlink:type="simple" xlink:href="aby-20180331.xsd#EarningsPerShareTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/OtherOperatingExpensesTables" xlink:type="simple" xlink:href="aby-20180331.xsd#OtherOperatingExpensesTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialIncomeAndExpensesTables" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialIncomeAndExpensesTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/TradePayablesAndOtherCurrentLiabilitiesTables" xlink:type="simple" xlink:href="aby-20180331.xsd#TradePayablesAndOtherCurrentLiabilitiesTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/GrantsAndOtherLiabilitiesTables" xlink:type="simple" xlink:href="aby-20180331.xsd#GrantsAndOtherLiabilitiesTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ProjectDebtTables" xlink:type="simple" xlink:href="aby-20180331.xsd#ProjectDebtTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/CorporateDebtTables" xlink:type="simple" xlink:href="aby-20180331.xsd#CorporateDebtTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ClientsAndOtherReceivableTables" xlink:type="simple" xlink:href="aby-20180331.xsd#ClientsAndOtherReceivableTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/RelatedPartiesTables" xlink:type="simple" xlink:href="aby-20180331.xsd#RelatedPartiesTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/DerivativeFinancialInstrumentsTables" xlink:type="simple" xlink:href="aby-20180331.xsd#DerivativeFinancialInstrumentsTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInvestmentsTables" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInvestmentsTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/InvestmentsCarriedUnderEquityMethodTables" xlink:type="simple" xlink:href="aby-20180331.xsd#InvestmentsCarriedUnderEquityMethodTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ContractedConcessionalAssetsTables" xlink:type="simple" xlink:href="aby-20180331.xsd#ContractedConcessionalAssetsTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegmentTables" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegmentTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/BasisOfPreparationTables" xlink:type="simple" xlink:href="aby-20180331.xsd#BasisOfPreparationTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/NatureOfBusinessTables" xlink:type="simple" xlink:href="aby-20180331.xsd#NatureOfBusinessTables" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FairValueOfFinancialInstrumentsPolicies" xlink:type="simple" xlink:href="aby-20180331.xsd#FairValueOfFinancialInstrumentsPolicies" />
  <link:roleRef roleURI="http://atlanticayield.com/role/BasisOfPreparationPolicies" xlink:type="simple" xlink:href="aby-20180331.xsd#BasisOfPreparationPolicies" />
  <link:roleRef roleURI="http://atlanticayield.com/role/SubsequentEvents" xlink:type="simple" xlink:href="aby-20180331.xsd#SubsequentEvents" />
  <link:roleRef roleURI="http://atlanticayield.com/role/EarningsPerShare" xlink:type="simple" xlink:href="aby-20180331.xsd#EarningsPerShare" />
  <link:roleRef roleURI="http://atlanticayield.com/role/OtherOperatingExpenses" xlink:type="simple" xlink:href="aby-20180331.xsd#OtherOperatingExpenses" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialIncomeAndExpenses" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialIncomeAndExpenses" />
  <link:roleRef roleURI="http://atlanticayield.com/role/IncomeTax" xlink:type="simple" xlink:href="aby-20180331.xsd#IncomeTax" />
  <link:roleRef roleURI="http://atlanticayield.com/role/TradePayablesAndOtherCurrentLiabilities" xlink:type="simple" xlink:href="aby-20180331.xsd#TradePayablesAndOtherCurrentLiabilities" />
  <link:roleRef roleURI="http://atlanticayield.com/role/GrantsAndOtherLiabilities" xlink:type="simple" xlink:href="aby-20180331.xsd#GrantsAndOtherLiabilities" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ProjectDebt" xlink:type="simple" xlink:href="aby-20180331.xsd#ProjectDebt" />
  <link:roleRef roleURI="http://atlanticayield.com/role/CorporateDebt" xlink:type="simple" xlink:href="aby-20180331.xsd#CorporateDebt" />
  <link:roleRef roleURI="http://atlanticayield.com/role/Equity" xlink:type="simple" xlink:href="aby-20180331.xsd#Equity" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ClientsAndOtherReceivable" xlink:type="simple" xlink:href="aby-20180331.xsd#ClientsAndOtherReceivable" />
  <link:roleRef roleURI="http://atlanticayield.com/role/RelatedParties" xlink:type="simple" xlink:href="aby-20180331.xsd#RelatedParties" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FairValueOfFinancialInstruments" xlink:type="simple" xlink:href="aby-20180331.xsd#FairValueOfFinancialInstruments" />
  <link:roleRef roleURI="http://atlanticayield.com/role/DerivativeFinancialInstruments" xlink:type="simple" xlink:href="aby-20180331.xsd#DerivativeFinancialInstruments" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInvestments" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInvestments" />
  <link:roleRef roleURI="http://atlanticayield.com/role/InvestmentsCarriedUnderEquityMethod" xlink:type="simple" xlink:href="aby-20180331.xsd#InvestmentsCarriedUnderEquityMethod" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ContractedConcessionalAssets" xlink:type="simple" xlink:href="aby-20180331.xsd#ContractedConcessionalAssets" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ChangesInScopeOfConsolidatedCondensedInterimFinancialStatements" xlink:type="simple" xlink:href="aby-20180331.xsd#ChangesInScopeOfConsolidatedCondensedInterimFinancialStatements" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialInformationBySegment" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialInformationBySegment" />
  <link:roleRef roleURI="http://atlanticayield.com/role/FinancialRiskManagement" xlink:type="simple" xlink:href="aby-20180331.xsd#FinancialRiskManagement" />
  <link:roleRef roleURI="http://atlanticayield.com/role/BasisOfPreparation" xlink:type="simple" xlink:href="aby-20180331.xsd#BasisOfPreparation" />
  <link:roleRef roleURI="http://atlanticayield.com/role/NatureOfBusiness" xlink:type="simple" xlink:href="aby-20180331.xsd#NatureOfBusiness" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ConsolidatedCondensedCashFlowStatementsParenthetical" xlink:type="simple" xlink:href="aby-20180331.xsd#ConsolidatedCondensedCashFlowStatementsParenthetical" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ConsolidatedCondensedCashFlowStatements" xlink:type="simple" xlink:href="aby-20180331.xsd#ConsolidatedCondensedCashFlowStatements" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ConsolidatedCondensedStatementsOfChangesInEquity" xlink:type="simple" xlink:href="aby-20180331.xsd#ConsolidatedCondensedStatementsOfChangesInEquity" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ConsolidatedCondensedStatementsOfComprehensiveIncome" xlink:type="simple" xlink:href="aby-20180331.xsd#ConsolidatedCondensedStatementsOfComprehensiveIncome" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ConsolidatedCondensedIncomeStatements" xlink:type="simple" xlink:href="aby-20180331.xsd#ConsolidatedCondensedIncomeStatements" />
  <link:roleRef roleURI="http://atlanticayield.com/role/ConsolidatedCondensedStatementsOfFinancialPosition" xlink:type="simple" xlink:href="aby-20180331.xsd#ConsolidatedCondensedStatementsOfFinancialPosition" />
  <link:roleRef roleURI="http://atlanticayield.com/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="aby-20180331.xsd#DocumentAndEntityInformation" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/DocumentAndEntityInformation" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ConsolidatedCondensedStatementsOfFinancialPosition" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ConsolidatedCondensedIncomeStatements" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ConsolidatedCondensedStatementsOfComprehensiveIncome" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ConsolidatedCondensedStatementsOfChangesInEquity">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="StatementOfChangesInEquityLineItems" xlink:title="StatementOfChangesInEquityLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Equity" xlink:label="Equity" xlink:title="Equity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="Equity" xlink:title="definition: StatementOfChangesInEquityLineItems to Equity" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLoss" xlink:label="ProfitLoss" xlink:title="ProfitLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="ProfitLoss" xlink:title="definition: StatementOfChangesInEquityLineItems to ProfitLoss" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_IncreaseDecreaseInFairValueOfCashFlowHedges" xlink:label="IncreaseDecreaseInFairValueOfCashFlowHedges" xlink:title="IncreaseDecreaseInFairValueOfCashFlowHedges" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="IncreaseDecreaseInFairValueOfCashFlowHedges" xlink:title="definition: StatementOfChangesInEquityLineItems to IncreaseDecreaseInFairValueOfCashFlowHedges" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:label="GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:title="GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:title="definition: StatementOfChangesInEquityLineItems to GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_IncomeTaxRelatingToIncreaseDecreaseInFairValueOfCashFlowHedges" xlink:label="IncomeTaxRelatingToIncreaseDecreaseInFairValueOfCashFlowHedges" xlink:title="IncomeTaxRelatingToIncreaseDecreaseInFairValueOfCashFlowHedges" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="IncomeTaxRelatingToIncreaseDecreaseInFairValueOfCashFlowHedges" xlink:title="definition: StatementOfChangesInEquityLineItems to IncomeTaxRelatingToIncreaseDecreaseInFairValueOfCashFlowHedges" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="OtherComprehensiveIncome" xlink:title="OtherComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="OtherComprehensiveIncome" xlink:title="definition: StatementOfChangesInEquityLineItems to OtherComprehensiveIncome" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ComprehensiveIncome" xlink:title="ComprehensiveIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="ComprehensiveIncome" xlink:title="definition: StatementOfChangesInEquityLineItems to ComprehensiveIncome" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DividendsPaid" xlink:label="DividendsPaid" xlink:title="DividendsPaid" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="DividendsPaid" xlink:title="definition: StatementOfChangesInEquityLineItems to DividendsPaid" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="StatementOfChangesInEquityTable" xlink:title="StatementOfChangesInEquityTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="StatementOfChangesInEquityTable" xlink:title="definition: StatementOfChangesInEquityLineItems to StatementOfChangesInEquityTable" order="9.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ComponentsOfEquityAxis" xlink:title="ComponentsOfEquityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="StatementOfChangesInEquityTable" xlink:to="ComponentsOfEquityAxis" xlink:title="definition: StatementOfChangesInEquityTable to ComponentsOfEquityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="EquityMember" xlink:title="EquityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ComponentsOfEquityAxis" xlink:to="EquityMember" xlink:title="definition: ComponentsOfEquityAxis to EquityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="EquityMember_2" xlink:title="EquityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ComponentsOfEquityAxis" xlink:to="EquityMember_2" xlink:title="definition: ComponentsOfEquityAxis to EquityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="EquityAttributableToOwnersOfParentMember" xlink:title="EquityAttributableToOwnersOfParentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EquityMember" xlink:to="EquityAttributableToOwnersOfParentMember" xlink:title="definition: EquityMember to EquityAttributableToOwnersOfParentMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="NoncontrollingInterestsMember" xlink:title="NoncontrollingInterestsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EquityMember" xlink:to="NoncontrollingInterestsMember" xlink:title="definition: EquityMember to NoncontrollingInterestsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IssuedCapitalMember" xlink:label="IssuedCapitalMember" xlink:title="IssuedCapitalMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="IssuedCapitalMember" xlink:title="definition: EquityAttributableToOwnersOfParentMember to IssuedCapitalMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ParentCompanyReservesMember" xlink:label="ParentCompanyReservesMember" xlink:title="ParentCompanyReservesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="ParentCompanyReservesMember" xlink:title="definition: EquityAttributableToOwnersOfParentMember to ParentCompanyReservesMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReserveOfCashFlowHedgesMember" xlink:label="ReserveOfCashFlowHedgesMember" xlink:title="ReserveOfCashFlowHedgesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="ReserveOfCashFlowHedgesMember" xlink:title="definition: EquityAttributableToOwnersOfParentMember to ReserveOfCashFlowHedgesMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RetainedEarningsMember" xlink:label="RetainedEarningsMember" xlink:title="RetainedEarningsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="RetainedEarningsMember" xlink:title="definition: EquityAttributableToOwnersOfParentMember to RetainedEarningsMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:label="ReserveOfExchangeDifferencesOnTranslationMember" xlink:title="ReserveOfExchangeDifferencesOnTranslationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="ReserveOfExchangeDifferencesOnTranslationMember" xlink:title="definition: EquityAttributableToOwnersOfParentMember to ReserveOfExchangeDifferencesOnTranslationMember" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:label="RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:title="RetrospectiveApplicationAndRetrospectiveRestatementAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="StatementOfChangesInEquityTable" xlink:to="RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:title="definition: StatementOfChangesInEquityTable to RetrospectiveApplicationAndRetrospectiveRestatementAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RestatedMember" xlink:label="RestatedMember" xlink:title="RestatedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:to="RestatedMember" xlink:title="definition: RetrospectiveApplicationAndRetrospectiveRestatementAxis to RestatedMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RestatedMember" xlink:label="RestatedMember_2" xlink:title="RestatedMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:to="RestatedMember_2" xlink:title="definition: RetrospectiveApplicationAndRetrospectiveRestatementAxis to RestatedMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AfterRestatementMember" xlink:label="AfterRestatementMember" xlink:title="AfterRestatementMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestatedMember" xlink:to="AfterRestatementMember" xlink:title="definition: RestatedMember to AfterRestatementMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:label="IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:title="IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RestatedMember" xlink:to="IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" xlink:title="definition: RestatedMember to IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ConsolidatedCondensedCashFlowStatements" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ConsolidatedCondensedCashFlowStatementsParenthetical" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/NatureOfBusiness" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/BasisOfPreparation" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialRiskManagement" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegment" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ChangesInScopeOfConsolidatedCondensedInterimFinancialStatements" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ContractedConcessionalAssets" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/InvestmentsCarriedUnderEquityMethod" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInvestments" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/DerivativeFinancialInstruments" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FairValueOfFinancialInstruments" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/RelatedParties" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ClientsAndOtherReceivable" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/Equity" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/CorporateDebt" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ProjectDebt" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/GrantsAndOtherLiabilities" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/TradePayablesAndOtherCurrentLiabilities" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/IncomeTax" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialIncomeAndExpenses" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/OtherOperatingExpenses" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/EarningsPerShare" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/SubsequentEvents" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/BasisOfPreparationPolicies" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FairValueOfFinancialInstrumentsPolicies" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/NatureOfBusinessTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/BasisOfPreparationTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegmentTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ContractedConcessionalAssetsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/InvestmentsCarriedUnderEquityMethodTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInvestmentsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/DerivativeFinancialInstrumentsTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/RelatedPartiesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ClientsAndOtherReceivableTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/CorporateDebtTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ProjectDebtTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/GrantsAndOtherLiabilitiesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/TradePayablesAndOtherCurrentLiabilitiesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialIncomeAndExpensesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/OtherOperatingExpensesTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/EarningsPerShareTables" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/NatureOfBusinessDescriptionDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:label="DisclosureOfClassesOfShareCapitalLineItems" xlink:title="DisclosureOfClassesOfShareCapitalLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NatureOfTheBusinessDisclosureAbstract" xlink:label="NatureOfTheBusinessDisclosureAbstract" xlink:title="NatureOfTheBusinessDisclosureAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="NatureOfTheBusinessDisclosureAbstract" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to NatureOfTheBusinessDisclosureAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:label="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:title="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfSharesIssued" xlink:label="NumberOfSharesIssued" xlink:title="NumberOfSharesIssued" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="NumberOfSharesIssued" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to NumberOfSharesIssued" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SharePriceSaleOfStock" xlink:label="SharePriceSaleOfStock" xlink:title="SharePriceSaleOfStock" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="SharePriceSaleOfStock" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to SharePriceSaleOfStock" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProceedsFromIssuingShares" xlink:label="ProceedsFromIssuingShares" xlink:title="ProceedsFromIssuingShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="ProceedsFromIssuingShares" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to ProceedsFromIssuingShares" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_StockSoldInSecondaryOffering" xlink:label="StockSoldInSecondaryOffering" xlink:title="StockSoldInSecondaryOffering" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="StockSoldInSecondaryOffering" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to StockSoldInSecondaryOffering" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ProceedsFromIssuingSharesInitialPublicOfferingAndSecondaryOffering" xlink:label="ProceedsFromIssuingSharesInitialPublicOfferingAndSecondaryOffering" xlink:title="ProceedsFromIssuingSharesInitialPublicOfferingAndSecondaryOffering" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="ProceedsFromIssuingSharesInitialPublicOfferingAndSecondaryOffering" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to ProceedsFromIssuingSharesInitialPublicOfferingAndSecondaryOffering" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NumberOfContractedConcessionalAssetsContributed" xlink:label="NumberOfContractedConcessionalAssetsContributed" xlink:title="NumberOfContractedConcessionalAssetsContributed" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="NumberOfContractedConcessionalAssetsContributed" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to NumberOfContractedConcessionalAssetsContributed" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="PercentageOfVotingEquityInterestsAcquired" xlink:title="PercentageOfVotingEquityInterestsAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="PercentageOfVotingEquityInterestsAcquired" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to PercentageOfVotingEquityInterestsAcquired" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashTransferred" xlink:label="CashTransferred" xlink:title="CashTransferred" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="CashTransferred" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to CashTransferred" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CashRetainedByAcquireeAtAcquisitionDate" xlink:label="CashRetainedByAcquireeAtAcquisitionDate" xlink:title="CashRetainedByAcquireeAtAcquisitionDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="CashRetainedByAcquireeAtAcquisitionDate" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to CashRetainedByAcquireeAtAcquisitionDate" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:label="DisclosureOfClassesOfShareCapitalTable" xlink:title="DisclosureOfClassesOfShareCapitalTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="DisclosureOfClassesOfShareCapitalTable" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to DisclosureOfClassesOfShareCapitalTable" order="12.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="LegalEntityAxis" xlink:title="LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfClassesOfShareCapitalTable" xlink:to="LegalEntityAxis" xlink:title="definition: DisclosureOfClassesOfShareCapitalTable to LegalEntityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="LegalEntityAxis" xlink:to="EntityDomain" xlink:title="definition: LegalEntityAxis to EntityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain_2" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="LegalEntityAxis" xlink:to="EntityDomain_2" xlink:title="definition: LegalEntityAxis to EntityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AlgonquinMember" xlink:label="AlgonquinMember" xlink:title="AlgonquinMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="AlgonquinMember" xlink:title="definition: EntityDomain to AlgonquinMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AbengoaSAMember" xlink:label="AbengoaSAMember" xlink:title="AbengoaSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="AbengoaSAMember" xlink:title="definition: EntityDomain to AbengoaSAMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="CategoriesOfRelatedPartiesAxis" xlink:title="CategoriesOfRelatedPartiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfClassesOfShareCapitalTable" xlink:to="CategoriesOfRelatedPartiesAxis" xlink:title="definition: DisclosureOfClassesOfShareCapitalTable to CategoriesOfRelatedPartiesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="EntitysTotalForRelatedPartiesMember" xlink:title="EntitysTotalForRelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="CategoriesOfRelatedPartiesAxis" xlink:to="EntitysTotalForRelatedPartiesMember" xlink:title="definition: CategoriesOfRelatedPartiesAxis to EntitysTotalForRelatedPartiesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="EntitysTotalForRelatedPartiesMember_2" xlink:title="EntitysTotalForRelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="CategoriesOfRelatedPartiesAxis" xlink:to="EntitysTotalForRelatedPartiesMember_2" xlink:title="definition: CategoriesOfRelatedPartiesAxis to EntitysTotalForRelatedPartiesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SubsidiariesMember" xlink:label="SubsidiariesMember" xlink:title="SubsidiariesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForRelatedPartiesMember" xlink:to="SubsidiariesMember" xlink:title="definition: EntitysTotalForRelatedPartiesMember to SubsidiariesMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/NatureOfBusinessAssetsAcquiredDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="DisclosureOfBusinessCombinationsLineItems" xlink:title="DisclosureOfBusinessCombinationsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NatureOfTheBusinessDisclosureAbstract" xlink:label="NatureOfTheBusinessDisclosureAbstract" xlink:title="NatureOfTheBusinessDisclosureAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="NatureOfTheBusinessDisclosureAbstract" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to NatureOfTheBusinessDisclosureAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="PercentageOfVotingEquityInterestsAcquired" xlink:title="PercentageOfVotingEquityInterestsAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="PercentageOfVotingEquityInterestsAcquired" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to PercentageOfVotingEquityInterestsAcquired" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Capacity" xlink:label="Capacity" xlink:title="Capacity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="Capacity" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to Capacity" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:label="AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:title="AcquisitiondateFairValueOfTotalConsiderationTransferred" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to AcquisitiondateFairValueOfTotalConsiderationTransferred" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="DisclosureOfBusinessCombinationsTable" xlink:title="DisclosureOfBusinessCombinationsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="DisclosureOfBusinessCombinationsTable" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to DisclosureOfBusinessCombinationsTable" order="5.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfBusinessCombinationsTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfBusinessCombinationsTable to IntangibleAssetsMaterialToEntityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_KaxuMember" xlink:label="KaxuMember" xlink:title="KaxuMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="KaxuMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to KaxuMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Mini-HydroMember" xlink:label="Mini-HydroMember" xlink:title="Mini-HydroMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Mini-HydroMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Mini-HydroMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/NatureOfBusinessConcessionalAssetsOwnedDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="DisclosureOfBusinessCombinationsLineItems" xlink:title="DisclosureOfBusinessCombinationsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NatureOfTheBusinessDisclosureAbstract" xlink:label="NatureOfTheBusinessDisclosureAbstract" xlink:title="NatureOfTheBusinessDisclosureAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="NatureOfTheBusinessDisclosureAbstract" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to NatureOfTheBusinessDisclosureAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_TypeOfConcessionalAsset" xlink:label="TypeOfConcessionalAsset" xlink:title="TypeOfConcessionalAsset" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="TypeOfConcessionalAsset" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to TypeOfConcessionalAsset" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="ProportionOfOwnershipInterestInSubsidiary" xlink:title="ProportionOfOwnershipInterestInSubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="ProportionOfOwnershipInterestInSubsidiary" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to ProportionOfOwnershipInterestInSubsidiary" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_OwnershipInterestType" xlink:label="OwnershipInterestType" xlink:title="OwnershipInterestType" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="OwnershipInterestType" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to OwnershipInterestType" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LocationOfConcessionalAsset" xlink:label="LocationOfConcessionalAsset" xlink:title="LocationOfConcessionalAsset" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="LocationOfConcessionalAsset" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to LocationOfConcessionalAsset" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DescriptionOfFunctionalCurrency" xlink:label="DescriptionOfFunctionalCurrency" xlink:title="DescriptionOfFunctionalCurrency" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="DescriptionOfFunctionalCurrency" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to DescriptionOfFunctionalCurrency" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DescriptionOfGrossCapacity" xlink:label="DescriptionOfGrossCapacity" xlink:title="DescriptionOfGrossCapacity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="DescriptionOfGrossCapacity" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to DescriptionOfGrossCapacity" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CounterpartyCreditRatings" xlink:label="CounterpartyCreditRatings" xlink:title="CounterpartyCreditRatings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="CounterpartyCreditRatings" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to CounterpartyCreditRatings" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CommercialOperationDate" xlink:label="CommercialOperationDate" xlink:title="CommercialOperationDate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="CommercialOperationDate" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to CommercialOperationDate" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RemainingContractTerm" xlink:label="RemainingContractTerm" xlink:title="RemainingContractTerm" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="RemainingContractTerm" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to RemainingContractTerm" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:label="OtherNoncurrentFinancialLiabilities" xlink:title="OtherNoncurrentFinancialLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="OtherNoncurrentFinancialLiabilities" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to OtherNoncurrentFinancialLiabilities" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfEntitysRevenue" xlink:label="PercentageOfEntitysRevenue" xlink:title="PercentageOfEntitysRevenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="PercentageOfEntitysRevenue" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to PercentageOfEntitysRevenue" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PercentageOfEntitySRevenueReceivedOnceConditionsAreMet" xlink:label="PercentageOfEntitySRevenueReceivedOnceConditionsAreMet" xlink:title="PercentageOfEntitySRevenueReceivedOnceConditionsAreMet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="PercentageOfEntitySRevenueReceivedOnceConditionsAreMet" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to PercentageOfEntitySRevenueReceivedOnceConditionsAreMet" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:label="ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:title="ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to ProportionOfOwnershipInterestsHeldByNoncontrollingInterests" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="DisclosureOfBusinessCombinationsTable" xlink:title="DisclosureOfBusinessCombinationsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="DisclosureOfBusinessCombinationsTable" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to DisclosureOfBusinessCombinationsTable" order="15.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfBusinessCombinationsTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfBusinessCombinationsTable to IntangibleAssetsMaterialToEntityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SolanaMember" xlink:label="SolanaMember" xlink:title="SolanaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SolanaMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SolanaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_MojaveMember" xlink:label="MojaveMember" xlink:title="MojaveMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="MojaveMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to MojaveMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solaben2AndSolaben3Member" xlink:label="Solaben2AndSolaben3Member" xlink:title="Solaben2AndSolaben3Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solaben2AndSolaben3Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solaben2AndSolaben3Member" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solacor1AndSolacor2Member" xlink:label="Solacor1AndSolacor2Member" xlink:title="Solacor1AndSolacor2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solacor1AndSolacor2Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solacor1AndSolacor2Member" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Helioenergy1And2Member" xlink:label="Helioenergy1And2Member" xlink:title="Helioenergy1And2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Helioenergy1And2Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Helioenergy1And2Member" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Helios1And2Member" xlink:label="Helios1And2Member" xlink:title="Helios1And2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Helios1And2Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Helios1And2Member" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solnova13And4Member" xlink:label="Solnova13And4Member" xlink:title="Solnova13And4Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solnova13And4Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solnova13And4Member" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solaben1And6Member" xlink:label="Solaben1And6Member" xlink:title="Solaben1And6Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solaben1And6Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solaben1And6Member" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SevillePVMember" xlink:label="SevillePVMember" xlink:title="SevillePVMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SevillePVMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SevillePVMember" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_KaxuMember" xlink:label="KaxuMember" xlink:title="KaxuMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="KaxuMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to KaxuMember" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PalmatirMember" xlink:label="PalmatirMember" xlink:title="PalmatirMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="PalmatirMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to PalmatirMember" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CadonalMember" xlink:label="CadonalMember" xlink:title="CadonalMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="CadonalMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to CadonalMember" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Mini-HydroMember" xlink:label="Mini-HydroMember" xlink:title="Mini-HydroMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Mini-HydroMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Mini-HydroMember" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solnova1Member" xlink:label="Solnova1Member" xlink:title="Solnova1Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Solnova13And4Member" xlink:to="Solnova1Member" xlink:title="definition: Solnova13And4Member to Solnova1Member" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solnova3Member" xlink:label="Solnova3Member" xlink:title="Solnova3Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Solnova13And4Member" xlink:to="Solnova3Member" xlink:title="definition: Solnova13And4Member to Solnova3Member" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solnova4Member" xlink:label="Solnova4Member" xlink:title="Solnova4Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Solnova13And4Member" xlink:to="Solnova4Member" xlink:title="definition: Solnova13And4Member to Solnova4Member" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solaben2Member" xlink:label="Solaben2Member" xlink:title="Solaben2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Solaben2AndSolaben3Member" xlink:to="Solaben2Member" xlink:title="definition: Solaben2AndSolaben3Member to Solaben2Member" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solaben3Member" xlink:label="Solaben3Member" xlink:title="Solaben3Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Solaben2AndSolaben3Member" xlink:to="Solaben3Member" xlink:title="definition: Solaben2AndSolaben3Member to Solaben3Member" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ClassesOfPropertyPlantAndEquipmentAxis" xlink:title="ClassesOfPropertyPlantAndEquipmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfBusinessCombinationsTable" xlink:to="ClassesOfPropertyPlantAndEquipmentAxis" xlink:title="definition: DisclosureOfBusinessCombinationsTable to ClassesOfPropertyPlantAndEquipmentAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="PropertyPlantAndEquipmentMember" xlink:title="PropertyPlantAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="PropertyPlantAndEquipmentMember" xlink:title="definition: ClassesOfPropertyPlantAndEquipmentAxis to PropertyPlantAndEquipmentMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="PropertyPlantAndEquipmentMember_2" xlink:title="PropertyPlantAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="PropertyPlantAndEquipmentMember_2" xlink:title="definition: ClassesOfPropertyPlantAndEquipmentAxis to PropertyPlantAndEquipmentMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PS10AndPS20Member" xlink:label="PS10AndPS20Member" xlink:title="PS10AndPS20Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentMember" xlink:to="PS10AndPS20Member" xlink:title="definition: PropertyPlantAndEquipmentMember to PS10AndPS20Member" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PS10Member" xlink:label="PS10Member" xlink:title="PS10Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PS10AndPS20Member" xlink:to="PS10Member" xlink:title="definition: PS10AndPS20Member to PS10Member" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PS20Member" xlink:label="PS20Member" xlink:title="PS20Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PS10AndPS20Member" xlink:to="PS20Member" xlink:title="definition: PS10AndPS20Member to PS20Member" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfFinancialAssetsAxis" xlink:label="TypesOfFinancialAssetsAxis" xlink:title="TypesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfBusinessCombinationsTable" xlink:to="TypesOfFinancialAssetsAxis" xlink:title="definition: DisclosureOfBusinessCombinationsTable to TypesOfFinancialAssetsAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsTypeMember" xlink:label="FinancialAssetsTypeMember" xlink:title="FinancialAssetsTypeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="TypesOfFinancialAssetsAxis" xlink:to="FinancialAssetsTypeMember" xlink:title="definition: TypesOfFinancialAssetsAxis to FinancialAssetsTypeMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsTypeMember" xlink:label="FinancialAssetsTypeMember_2" xlink:title="FinancialAssetsTypeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="TypesOfFinancialAssetsAxis" xlink:to="FinancialAssetsTypeMember_2" xlink:title="definition: TypesOfFinancialAssetsAxis to FinancialAssetsTypeMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ACTMember" xlink:label="ACTMember" xlink:title="ACTMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="ACTMember" xlink:title="definition: FinancialAssetsTypeMember to ACTMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ATNMember" xlink:label="ATNMember" xlink:title="ATNMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="ATNMember" xlink:title="definition: FinancialAssetsTypeMember to ATNMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ATSMember" xlink:label="ATSMember" xlink:title="ATSMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="ATSMember" xlink:title="definition: FinancialAssetsTypeMember to ATSMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ATN2ConcessionalAssetMember" xlink:label="ATN2ConcessionalAssetMember" xlink:title="ATN2ConcessionalAssetMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="ATN2ConcessionalAssetMember" xlink:title="definition: FinancialAssetsTypeMember to ATN2ConcessionalAssetMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Quadra1Member" xlink:label="Quadra1Member" xlink:title="Quadra1Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="Quadra1Member" xlink:title="definition: FinancialAssetsTypeMember to Quadra1Member" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Quadra2Member" xlink:label="Quadra2Member" xlink:title="Quadra2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="Quadra2Member" xlink:title="definition: FinancialAssetsTypeMember to Quadra2Member" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PalmuchoMember" xlink:label="PalmuchoMember" xlink:title="PalmuchoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="PalmuchoMember" xlink:title="definition: FinancialAssetsTypeMember to PalmuchoMember" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SkikdaMember" xlink:label="SkikdaMember" xlink:title="SkikdaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="SkikdaMember" xlink:title="definition: FinancialAssetsTypeMember to SkikdaMember" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_HonaineMember" xlink:label="HonaineMember" xlink:title="HonaineMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="HonaineMember" xlink:title="definition: FinancialAssetsTypeMember to HonaineMember" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="LegalEntityAxis" xlink:title="LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfBusinessCombinationsTable" xlink:to="LegalEntityAxis" xlink:title="definition: DisclosureOfBusinessCombinationsTable to LegalEntityAxis" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="LegalEntityAxis" xlink:to="EntityDomain" xlink:title="definition: LegalEntityAxis to EntityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain_2" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="LegalEntityAxis" xlink:to="EntityDomain_2" xlink:title="definition: LegalEntityAxis to EntityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LibertyInteractiveCorporationMember" xlink:label="LibertyInteractiveCorporationMember" xlink:title="LibertyInteractiveCorporationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="LibertyInteractiveCorporationMember" xlink:title="definition: EntityDomain to LibertyInteractiveCorporationMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ItochuCorporationMember" xlink:label="ItochuCorporationMember" xlink:title="ItochuCorporationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="ItochuCorporationMember" xlink:title="definition: EntityDomain to ItochuCorporationMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_JGCCorporationMember" xlink:label="JGCCorporationMember" xlink:title="JGCCorporationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="JGCCorporationMember" xlink:title="definition: EntityDomain to JGCCorporationMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_IndustrialDevelopmentCorporationOfSouthAfricaMember" xlink:label="IndustrialDevelopmentCorporationOfSouthAfricaMember" xlink:title="IndustrialDevelopmentCorporationOfSouthAfricaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="IndustrialDevelopmentCorporationOfSouthAfricaMember" xlink:title="definition: EntityDomain to IndustrialDevelopmentCorporationOfSouthAfricaMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_KaxuCommunityTrustMember" xlink:label="KaxuCommunityTrustMember" xlink:title="KaxuCommunityTrustMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="KaxuCommunityTrustMember" xlink:title="definition: EntityDomain to KaxuCommunityTrustMember" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AlgerianEnergyCompanySPAMember" xlink:label="AlgerianEnergyCompanySPAMember" xlink:title="AlgerianEnergyCompanySPAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="AlgerianEnergyCompanySPAMember" xlink:title="definition: EntityDomain to AlgerianEnergyCompanySPAMember" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SadytSociedadAnonimaDepuracionYTratamientosMember" xlink:label="SadytSociedadAnonimaDepuracionYTratamientosMember" xlink:title="SadytSociedadAnonimaDepuracionYTratamientosMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="SadytSociedadAnonimaDepuracionYTratamientosMember" xlink:title="definition: EntityDomain to SadytSociedadAnonimaDepuracionYTratamientosMember" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_InstitutoParaLaDiversificacionYAhorroDeLaEnergiaMember" xlink:label="InstitutoParaLaDiversificacionYAhorroDeLaEnergiaMember" xlink:title="InstitutoParaLaDiversificacionYAhorroDeLaEnergiaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="InstitutoParaLaDiversificacionYAhorroDeLaEnergiaMember" xlink:title="definition: EntityDomain to InstitutoParaLaDiversificacionYAhorroDeLaEnergiaMember" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="RangeAxis" xlink:title="RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfBusinessCombinationsTable" xlink:to="RangeAxis" xlink:title="definition: DisclosureOfBusinessCombinationsTable to RangeAxis" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="RangesMember" xlink:title="RangesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="RangeAxis" xlink:to="RangesMember" xlink:title="definition: RangeAxis to RangesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="RangesMember_2" xlink:title="RangesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="RangeAxis" xlink:to="RangesMember_2" xlink:title="definition: RangeAxis to RangesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="BottomOfRangeMember" xlink:title="BottomOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RangesMember" xlink:to="BottomOfRangeMember" xlink:title="definition: RangesMember to BottomOfRangeMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="TopOfRangeMember" xlink:title="TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RangesMember" xlink:to="TopOfRangeMember" xlink:title="definition: RangesMember to TopOfRangeMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/NatureOfBusinessFinancingArrangementsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FinancingArrangementsAbstract" xlink:label="FinancingArrangementsAbstract" xlink:title="FinancingArrangementsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="FinancingArrangementsAbstract" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to FinancingArrangementsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_MinimumOwnershipRequirementPercentage" xlink:label="MinimumOwnershipRequirementPercentage" xlink:title="MinimumOwnershipRequirementPercentage" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="MinimumOwnershipRequirementPercentage" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to MinimumOwnershipRequirementPercentage" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:label="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:title="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PercentageOfOutstandingSharesPledgedAsCollateral" xlink:label="PercentageOfOutstandingSharesPledgedAsCollateral" xlink:title="PercentageOfOutstandingSharesPledgedAsCollateral" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="PercentageOfOutstandingSharesPledgedAsCollateral" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to PercentageOfOutstandingSharesPledgedAsCollateral" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RemainingOwnershipPercentageEntityIntendsToSell" xlink:label="RemainingOwnershipPercentageEntityIntendsToSell" xlink:title="RemainingOwnershipPercentageEntityIntendsToSell" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="RemainingOwnershipPercentageEntityIntendsToSell" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to RemainingOwnershipPercentageEntityIntendsToSell" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfDetailedInformationAboutBorrowingsTable" order="6.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="LegalEntityAxis" xlink:title="LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="LegalEntityAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to LegalEntityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="LegalEntityAxis" xlink:to="EntityDomain" xlink:title="definition: LegalEntityAxis to EntityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain_2" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="LegalEntityAxis" xlink:to="EntityDomain_2" xlink:title="definition: LegalEntityAxis to EntityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AbengoaSAMember" xlink:label="AbengoaSAMember" xlink:title="AbengoaSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="AbengoaSAMember" xlink:title="definition: EntityDomain to AbengoaSAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to IntangibleAssetsMaterialToEntityAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SolanaAndMojaveMember" xlink:label="SolanaAndMojaveMember" xlink:title="SolanaAndMojaveMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SolanaAndMojaveMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SolanaAndMojaveMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="BorrowingsByNameAxis" xlink:title="BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="BorrowingsByNameAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to BorrowingsByNameAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember_2" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember_2" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoteIssuanceFacilityMember" xlink:label="NoteIssuanceFacilityMember" xlink:title="NoteIssuanceFacilityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="NoteIssuanceFacilityMember" xlink:title="definition: BorrowingsByNameMember to NoteIssuanceFacilityMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/BasisOfPreparationDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:label="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:title="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ContractedConcessionalAssets" xlink:label="ContractedConcessionalAssets" xlink:title="ContractedConcessionalAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="ContractedConcessionalAssets" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to ContractedConcessionalAssets" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DeferredTaxAssets" xlink:label="DeferredTaxAssets" xlink:title="DeferredTaxAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="DeferredTaxAssets" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to DeferredTaxAssets" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoncurrentPortionOfNoncurrentProjectDebt" xlink:label="NoncurrentPortionOfNoncurrentProjectDebt" xlink:title="NoncurrentPortionOfNoncurrentProjectDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="NoncurrentPortionOfNoncurrentProjectDebt" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to NoncurrentPortionOfNoncurrentProjectDebt" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:label="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DeferredTaxLiabilities" xlink:label="DeferredTaxLiabilities" xlink:title="DeferredTaxLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="DeferredTaxLiabilities" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to DeferredTaxLiabilities" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherReserves" xlink:label="OtherReserves" xlink:title="OtherReserves" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="OtherReserves" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to OtherReserves" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RetainedEarnings" xlink:label="RetainedEarnings" xlink:title="RetainedEarnings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="RetainedEarnings" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to RetainedEarnings" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssets" xlink:label="FinancialAssets" xlink:title="FinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="FinancialAssets" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to FinancialAssets" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable" xlink:label="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable" xlink:title="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems" xlink:to="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems to DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable" order="9.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NewIFRSsAxis" xlink:label="NewIFRSsAxis" xlink:title="NewIFRSsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable" xlink:to="NewIFRSsAxis" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable to NewIFRSsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NewIFRSsMember" xlink:label="NewIFRSsMember" xlink:title="NewIFRSsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="NewIFRSsAxis" xlink:to="NewIFRSsMember" xlink:title="definition: NewIFRSsAxis to NewIFRSsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NewIFRSsMember" xlink:label="NewIFRSsMember_2" xlink:title="NewIFRSsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="NewIFRSsAxis" xlink:to="NewIFRSsMember_2" xlink:title="definition: NewIFRSsAxis to NewIFRSsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InAccordanceWithIFRS9Member" xlink:label="InAccordanceWithIFRS9Member" xlink:title="InAccordanceWithIFRS9Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NewIFRSsMember" xlink:to="InAccordanceWithIFRS9Member" xlink:title="definition: NewIFRSsMember to InAccordanceWithIFRS9Member" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_InAccordanceWithIFRS16Member" xlink:label="InAccordanceWithIFRS16Member" xlink:title="InAccordanceWithIFRS16Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NewIFRSsMember" xlink:to="InAccordanceWithIFRS16Member" xlink:title="definition: NewIFRSsMember to InAccordanceWithIFRS16Member" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AdjustmentRestatementMember" xlink:label="AdjustmentRestatementMember" xlink:title="AdjustmentRestatementMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NewIFRSsMember" xlink:to="AdjustmentRestatementMember" xlink:title="definition: NewIFRSsMember to AdjustmentRestatementMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis" xlink:label="ClassesOfFinancialInstrumentsAxis" xlink:title="ClassesOfFinancialInstrumentsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable" xlink:to="ClassesOfFinancialInstrumentsAxis" xlink:title="definition: DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable to ClassesOfFinancialInstrumentsAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="ClassesOfFinancialInstrumentsMember" xlink:title="ClassesOfFinancialInstrumentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ClassesOfFinancialInstrumentsAxis" xlink:to="ClassesOfFinancialInstrumentsMember" xlink:title="definition: ClassesOfFinancialInstrumentsAxis to ClassesOfFinancialInstrumentsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="ClassesOfFinancialInstrumentsMember_2" xlink:title="ClassesOfFinancialInstrumentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ClassesOfFinancialInstrumentsAxis" xlink:to="ClassesOfFinancialInstrumentsMember_2" xlink:title="definition: ClassesOfFinancialInstrumentsAxis to ClassesOfFinancialInstrumentsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LifetimeExpectedCreditLossesMember" xlink:label="LifetimeExpectedCreditLossesMember" xlink:title="LifetimeExpectedCreditLossesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassesOfFinancialInstrumentsMember" xlink:to="LifetimeExpectedCreditLossesMember" xlink:title="definition: ClassesOfFinancialInstrumentsMember to LifetimeExpectedCreditLossesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FinancialLiabilitiesModificationMember" xlink:label="FinancialLiabilitiesModificationMember" xlink:title="FinancialLiabilitiesModificationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassesOfFinancialInstrumentsMember" xlink:to="FinancialLiabilitiesModificationMember" xlink:title="definition: ClassesOfFinancialInstrumentsMember to FinancialLiabilitiesModificationMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfHedgesMember" xlink:label="TypesOfHedgesMember" xlink:title="TypesOfHedgesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ClassesOfFinancialInstrumentsMember" xlink:to="TypesOfHedgesMember" xlink:title="definition: ClassesOfFinancialInstrumentsMember to TypesOfHedgesMember" order="3.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegmentBusinessSectorsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="DisclosureOfOperatingSegmentsLineItems" xlink:title="DisclosureOfOperatingSegmentsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SegmentInformationAbstract" xlink:label="SegmentInformationAbstract" xlink:title="SegmentInformationAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="SegmentInformationAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to SegmentInformationAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NumberOfContractedConcessionalAssets" xlink:label="NumberOfContractedConcessionalAssets" xlink:title="NumberOfContractedConcessionalAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="NumberOfContractedConcessionalAssets" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to NumberOfContractedConcessionalAssets" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Capacity" xlink:label="Capacity" xlink:title="Capacity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Capacity" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Capacity" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_TakeOrPayContractTerm" xlink:label="TakeOrPayContractTerm" xlink:title="TakeOrPayContractTerm" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="TakeOrPayContractTerm" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to TakeOrPayContractTerm" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LengthOfTransmissionLines" xlink:label="LengthOfTransmissionLines" xlink:title="LengthOfTransmissionLines" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LengthOfTransmissionLines" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LengthOfTransmissionLines" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FlowCapacity" xlink:label="FlowCapacity" xlink:title="FlowCapacity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="FlowCapacity" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to FlowCapacity" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="DisclosureOfOperatingSegmentsTable" xlink:title="DisclosureOfOperatingSegmentsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DisclosureOfOperatingSegmentsTable" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DisclosureOfOperatingSegmentsTable" order="7.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="GeographicalAreasAxis" xlink:title="GeographicalAreasAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="GeographicalAreasAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to GeographicalAreasAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="GeographicalAreasMember" xlink:title="GeographicalAreasMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="GeographicalAreasAxis" xlink:to="GeographicalAreasMember" xlink:title="definition: GeographicalAreasAxis to GeographicalAreasMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="GeographicalAreasMember_2" xlink:title="GeographicalAreasMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="GeographicalAreasAxis" xlink:to="GeographicalAreasMember_2" xlink:title="definition: GeographicalAreasAxis to GeographicalAreasMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="US" xlink:title="US" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="US" xlink:title="definition: GeographicalAreasMember to US" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_ES" xlink:label="ES" xlink:title="ES" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="ES" xlink:title="definition: GeographicalAreasMember to ES" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_ZA" xlink:label="ZA" xlink:title="ZA" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="ZA" xlink:title="definition: GeographicalAreasMember to ZA" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_UY" xlink:label="UY" xlink:title="UY" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="UY" xlink:title="definition: GeographicalAreasMember to UY" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_MX" xlink:label="MX" xlink:title="MX" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="MX" xlink:title="definition: GeographicalAreasMember to MX" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_PE" xlink:label="PE" xlink:title="PE" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="PE" xlink:title="definition: GeographicalAreasMember to PE" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_CL" xlink:label="CL" xlink:title="CL" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="CL" xlink:title="definition: GeographicalAreasMember to CL" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_DZ" xlink:label="DZ" xlink:title="DZ" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="GeographicalAreasMember" xlink:to="DZ" xlink:title="definition: GeographicalAreasMember to DZ" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ProductsAndServicesAxis" xlink:title="ProductsAndServicesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="ProductsAndServicesAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to ProductsAndServicesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember_2" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember_2" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RenewableEnergyMember" xlink:label="RenewableEnergyMember" xlink:title="RenewableEnergyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="RenewableEnergyMember" xlink:title="definition: ProductsAndServicesMember to RenewableEnergyMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_EfficientNaturalGasMember" xlink:label="EfficientNaturalGasMember" xlink:title="EfficientNaturalGasMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="EfficientNaturalGasMember" xlink:title="definition: ProductsAndServicesMember to EfficientNaturalGasMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ElectricTransmissionLinesMember" xlink:label="ElectricTransmissionLinesMember" xlink:title="ElectricTransmissionLinesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="ElectricTransmissionLinesMember" xlink:title="definition: ProductsAndServicesMember to ElectricTransmissionLinesMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_WaterMember" xlink:label="WaterMember" xlink:title="WaterMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="WaterMember" xlink:title="definition: ProductsAndServicesMember to WaterMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to IntangibleAssetsMaterialToEntityAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SolanaMember" xlink:label="SolanaMember" xlink:title="SolanaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SolanaMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SolanaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_MojaveMember" xlink:label="MojaveMember" xlink:title="MojaveMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="MojaveMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to MojaveMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solacor1AndSolacor2Member" xlink:label="Solacor1AndSolacor2Member" xlink:title="Solacor1AndSolacor2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solacor1AndSolacor2Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solacor1AndSolacor2Member" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solaben2AndSolaben3Member" xlink:label="Solaben2AndSolaben3Member" xlink:title="Solaben2AndSolaben3Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solaben2AndSolaben3Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solaben2AndSolaben3Member" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Helioenergy1And2Member" xlink:label="Helioenergy1And2Member" xlink:title="Helioenergy1And2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Helioenergy1And2Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Helioenergy1And2Member" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Helios1And2Member" xlink:label="Helios1And2Member" xlink:title="Helios1And2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Helios1And2Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Helios1And2Member" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solnova13And4Member" xlink:label="Solnova13And4Member" xlink:title="Solnova13And4Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solnova13And4Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solnova13And4Member" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Solaben1And6Member" xlink:label="Solaben1And6Member" xlink:title="Solaben1And6Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="Solaben1And6Member" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to Solaben1And6Member" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SevillePVMember" xlink:label="SevillePVMember" xlink:title="SevillePVMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SevillePVMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SevillePVMember" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_KaxuMember" xlink:label="KaxuMember" xlink:title="KaxuMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="KaxuMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to KaxuMember" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PalmatirMember" xlink:label="PalmatirMember" xlink:title="PalmatirMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="PalmatirMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to PalmatirMember" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CadonalMember" xlink:label="CadonalMember" xlink:title="CadonalMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="CadonalMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to CadonalMember" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="ClassesOfPropertyPlantAndEquipmentAxis" xlink:title="ClassesOfPropertyPlantAndEquipmentAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="ClassesOfPropertyPlantAndEquipmentAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to ClassesOfPropertyPlantAndEquipmentAxis" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="PropertyPlantAndEquipmentMember" xlink:title="PropertyPlantAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="PropertyPlantAndEquipmentMember" xlink:title="definition: ClassesOfPropertyPlantAndEquipmentAxis to PropertyPlantAndEquipmentMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="PropertyPlantAndEquipmentMember_2" xlink:title="PropertyPlantAndEquipmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ClassesOfPropertyPlantAndEquipmentAxis" xlink:to="PropertyPlantAndEquipmentMember_2" xlink:title="definition: ClassesOfPropertyPlantAndEquipmentAxis to PropertyPlantAndEquipmentMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PS10AndPS20Member" xlink:label="PS10AndPS20Member" xlink:title="PS10AndPS20Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PropertyPlantAndEquipmentMember" xlink:to="PS10AndPS20Member" xlink:title="definition: PropertyPlantAndEquipmentMember to PS10AndPS20Member" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfFinancialAssetsAxis" xlink:label="TypesOfFinancialAssetsAxis" xlink:title="TypesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="TypesOfFinancialAssetsAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to TypesOfFinancialAssetsAxis" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsTypeMember" xlink:label="FinancialAssetsTypeMember" xlink:title="FinancialAssetsTypeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="TypesOfFinancialAssetsAxis" xlink:to="FinancialAssetsTypeMember" xlink:title="definition: TypesOfFinancialAssetsAxis to FinancialAssetsTypeMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsTypeMember" xlink:label="FinancialAssetsTypeMember_2" xlink:title="FinancialAssetsTypeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="TypesOfFinancialAssetsAxis" xlink:to="FinancialAssetsTypeMember_2" xlink:title="definition: TypesOfFinancialAssetsAxis to FinancialAssetsTypeMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ACTMember" xlink:label="ACTMember" xlink:title="ACTMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="ACTMember" xlink:title="definition: FinancialAssetsTypeMember to ACTMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ATNATSAndATN2Member" xlink:label="ATNATSAndATN2Member" xlink:title="ATNATSAndATN2Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="ATNATSAndATN2Member" xlink:title="definition: FinancialAssetsTypeMember to ATNATSAndATN2Member" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Quadra1Quadra2AndPalmuchoMember" xlink:label="Quadra1Quadra2AndPalmuchoMember" xlink:title="Quadra1Quadra2AndPalmuchoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="Quadra1Quadra2AndPalmuchoMember" xlink:title="definition: FinancialAssetsTypeMember to Quadra1Quadra2AndPalmuchoMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_HonaineAndSkikdaMember" xlink:label="HonaineAndSkikdaMember" xlink:title="HonaineAndSkikdaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="HonaineAndSkikdaMember" xlink:title="definition: FinancialAssetsTypeMember to HonaineAndSkikdaMember" order="4.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegmentRevenuesAndFurtherAdjustedEbitdaDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="DisclosureOfOperatingSegmentsLineItems" xlink:title="DisclosureOfOperatingSegmentsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SegmentInformationAbstract" xlink:label="SegmentInformationAbstract" xlink:title="SegmentInformationAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="SegmentInformationAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to SegmentInformationAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NumberOfSignificantCustomers" xlink:label="NumberOfSignificantCustomers" xlink:title="NumberOfSignificantCustomers" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="NumberOfSignificantCustomers" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to NumberOfSignificantCustomers" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Revenue" xlink:label="Revenue" xlink:title="Revenue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Revenue" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Revenue" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FurtherAdjustedEBITDA" xlink:label="FurtherAdjustedEBITDA" xlink:title="FurtherAdjustedEBITDA" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="FurtherAdjustedEBITDA" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to FurtherAdjustedEBITDA" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="DisclosureOfOperatingSegmentsTable" xlink:title="DisclosureOfOperatingSegmentsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DisclosureOfOperatingSegmentsTable" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DisclosureOfOperatingSegmentsTable" order="5.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="StatementGeographicalAxis" xlink:title="StatementGeographicalAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="StatementGeographicalAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to StatementGeographicalAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain_2" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain_2" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NorthAmericaMember" xlink:label="NorthAmericaMember" xlink:title="NorthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="NorthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to NorthAmericaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SouthAmericaMember" xlink:label="SouthAmericaMember" xlink:title="SouthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SouthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to SouthAmericaMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EMEAMember" xlink:label="EMEAMember" xlink:title="EMEAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="EMEAMember" xlink:title="definition: SegmentGeographicalDomain to EMEAMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ProductsAndServicesAxis" xlink:title="ProductsAndServicesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="ProductsAndServicesAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to ProductsAndServicesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember_2" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember_2" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RenewableEnergyMember" xlink:label="RenewableEnergyMember" xlink:title="RenewableEnergyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="RenewableEnergyMember" xlink:title="definition: ProductsAndServicesMember to RenewableEnergyMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_EfficientNaturalGasMember" xlink:label="EfficientNaturalGasMember" xlink:title="EfficientNaturalGasMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="EfficientNaturalGasMember" xlink:title="definition: ProductsAndServicesMember to EfficientNaturalGasMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ElectricTransmissionLinesMember" xlink:label="ElectricTransmissionLinesMember" xlink:title="ElectricTransmissionLinesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="ElectricTransmissionLinesMember" xlink:title="definition: ProductsAndServicesMember to ElectricTransmissionLinesMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_WaterMember" xlink:label="WaterMember" xlink:title="WaterMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="WaterMember" xlink:title="definition: ProductsAndServicesMember to WaterMember" order="4.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegmentReconciliationOfSegmentFurtherAdjustedEbitdaDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="DisclosureOfOperatingSegmentsLineItems" xlink:title="DisclosureOfOperatingSegmentsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SegmentInformationAbstract" xlink:label="SegmentInformationAbstract" xlink:title="SegmentInformationAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="SegmentInformationAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to SegmentInformationAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:label="ProfitLossAttributableToOwnersOfParent" xlink:title="ProfitLossAttributableToOwnersOfParent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="ProfitLossAttributableToOwnersOfParent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to ProfitLossAttributableToOwnersOfParent" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="ProfitLossAttributableToNoncontrollingInterests" xlink:title="ProfitLossAttributableToNoncontrollingInterests" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="ProfitLossAttributableToNoncontrollingInterests" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to ProfitLossAttributableToNoncontrollingInterests" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="IncomeTaxExpenseContinuingOperations" xlink:title="IncomeTaxExpenseContinuingOperations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="IncomeTaxExpenseContinuingOperations" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to IncomeTaxExpenseContinuingOperations" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:label="ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:title="ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DividendIncomeCompensationPreferredEquityInvestment" xlink:label="DividendIncomeCompensationPreferredEquityInvestment" xlink:title="DividendIncomeCompensationPreferredEquityInvestment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DividendIncomeCompensationPreferredEquityInvestment" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DividendIncomeCompensationPreferredEquityInvestment" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FinancialExpenseIncomeNet" xlink:label="FinancialExpenseIncomeNet" xlink:title="FinancialExpenseIncomeNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="FinancialExpenseIncomeNet" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to FinancialExpenseIncomeNet" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:label="DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:title="DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FurtherAdjustedEBITDA" xlink:label="FurtherAdjustedEBITDA" xlink:title="FurtherAdjustedEBITDA" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="FurtherAdjustedEBITDA" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to FurtherAdjustedEBITDA" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="DisclosureOfOperatingSegmentsTable" xlink:title="DisclosureOfOperatingSegmentsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DisclosureOfOperatingSegmentsTable" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DisclosureOfOperatingSegmentsTable" order="10.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentConsolidationItemsAxis" xlink:label="SegmentConsolidationItemsAxis" xlink:title="SegmentConsolidationItemsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="SegmentConsolidationItemsAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to SegmentConsolidationItemsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="EntitysTotalForSegmentConsolidationItemsMember" xlink:title="EntitysTotalForSegmentConsolidationItemsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="SegmentConsolidationItemsAxis" xlink:to="EntitysTotalForSegmentConsolidationItemsMember" xlink:title="definition: SegmentConsolidationItemsAxis to EntitysTotalForSegmentConsolidationItemsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="EntitysTotalForSegmentConsolidationItemsMember_2" xlink:title="EntitysTotalForSegmentConsolidationItemsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="SegmentConsolidationItemsAxis" xlink:to="EntitysTotalForSegmentConsolidationItemsMember_2" xlink:title="definition: SegmentConsolidationItemsAxis to EntitysTotalForSegmentConsolidationItemsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaterialReconcilingItemsMember" xlink:label="MaterialReconcilingItemsMember" xlink:title="MaterialReconcilingItemsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForSegmentConsolidationItemsMember" xlink:to="MaterialReconcilingItemsMember" xlink:title="definition: EntitysTotalForSegmentConsolidationItemsMember to MaterialReconcilingItemsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OperatingSegmentsMember" xlink:label="OperatingSegmentsMember" xlink:title="OperatingSegmentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForSegmentConsolidationItemsMember" xlink:to="OperatingSegmentsMember" xlink:title="definition: EntitysTotalForSegmentConsolidationItemsMember to OperatingSegmentsMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegmentAssetsAndLiabilitiesByGeographyDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="DisclosureOfOperatingSegmentsLineItems" xlink:title="DisclosureOfOperatingSegmentsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AssetsAbstract" xlink:label="AssetsAbstract" xlink:title="AssetsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="AssetsAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to AssetsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesAbstract" xlink:label="LiabilitiesAbstract" xlink:title="LiabilitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LiabilitiesAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LiabilitiesAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Equity" xlink:label="Equity" xlink:title="Equity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Equity" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Equity" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityAndLiabilities" xlink:label="EquityAndLiabilities" xlink:title="EquityAndLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="EquityAndLiabilities" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to EquityAndLiabilities" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LongTermAndShortTermProjectDebt" xlink:label="LongTermAndShortTermProjectDebt" xlink:title="LongTermAndShortTermProjectDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LongTermAndShortTermProjectDebt" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LongTermAndShortTermProjectDebt" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:label="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LongTermAndShortTermCorporateDebt" xlink:label="LongTermAndShortTermCorporateDebt" xlink:title="LongTermAndShortTermCorporateDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LongTermAndShortTermCorporateDebt" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LongTermAndShortTermCorporateDebt" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LiabilitiesOtherNonCurrent" xlink:label="LiabilitiesOtherNonCurrent" xlink:title="LiabilitiesOtherNonCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LiabilitiesOtherNonCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LiabilitiesOtherNonCurrent" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LiabilitiesOtherCurrent" xlink:label="LiabilitiesOtherCurrent" xlink:title="LiabilitiesOtherCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LiabilitiesOtherCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LiabilitiesOtherCurrent" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Liabilities" xlink:label="Liabilities" xlink:title="Liabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Liabilities" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Liabilities" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ContractedConcessionalAssets" xlink:label="ContractedConcessionalAssets" xlink:title="ContractedConcessionalAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="ContractedConcessionalAssets" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to ContractedConcessionalAssets" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:label="InvestmentAccountedForUsingEquityMethod" xlink:title="InvestmentAccountedForUsingEquityMethod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="InvestmentAccountedForUsingEquityMethod" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to InvestmentAccountedForUsingEquityMethod" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentFinancialAssets" xlink:label="CurrentFinancialAssets" xlink:title="CurrentFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="CurrentFinancialAssets" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to CurrentFinancialAssets" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="CashAndCashEquivalents" xlink:title="CashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="CashAndCashEquivalents" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to CashAndCashEquivalents" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssetsOtherNonCurrent" xlink:label="AssetsOtherNonCurrent" xlink:title="AssetsOtherNonCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="AssetsOtherNonCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to AssetsOtherNonCurrent" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssetsOtherCurrent" xlink:label="AssetsOtherCurrent" xlink:title="AssetsOtherCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="AssetsOtherCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to AssetsOtherCurrent" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Assets" xlink:label="Assets" xlink:title="Assets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Assets" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Assets" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="DisclosureOfOperatingSegmentsTable" xlink:title="DisclosureOfOperatingSegmentsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DisclosureOfOperatingSegmentsTable" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DisclosureOfOperatingSegmentsTable" order="18.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentConsolidationItemsAxis" xlink:label="SegmentConsolidationItemsAxis" xlink:title="SegmentConsolidationItemsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="SegmentConsolidationItemsAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to SegmentConsolidationItemsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="EntitysTotalForSegmentConsolidationItemsMember" xlink:title="EntitysTotalForSegmentConsolidationItemsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="SegmentConsolidationItemsAxis" xlink:to="EntitysTotalForSegmentConsolidationItemsMember" xlink:title="definition: SegmentConsolidationItemsAxis to EntitysTotalForSegmentConsolidationItemsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="EntitysTotalForSegmentConsolidationItemsMember_2" xlink:title="EntitysTotalForSegmentConsolidationItemsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="SegmentConsolidationItemsAxis" xlink:to="EntitysTotalForSegmentConsolidationItemsMember_2" xlink:title="definition: SegmentConsolidationItemsAxis to EntitysTotalForSegmentConsolidationItemsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OperatingSegmentsMember" xlink:label="OperatingSegmentsMember" xlink:title="OperatingSegmentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForSegmentConsolidationItemsMember" xlink:to="OperatingSegmentsMember" xlink:title="definition: EntitysTotalForSegmentConsolidationItemsMember to OperatingSegmentsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnallocatedAmountsMember" xlink:label="UnallocatedAmountsMember" xlink:title="UnallocatedAmountsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForSegmentConsolidationItemsMember" xlink:to="UnallocatedAmountsMember" xlink:title="definition: EntitysTotalForSegmentConsolidationItemsMember to UnallocatedAmountsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="StatementGeographicalAxis" xlink:title="StatementGeographicalAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="StatementGeographicalAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to StatementGeographicalAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain_2" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain_2" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NorthAmericaMember" xlink:label="NorthAmericaMember" xlink:title="NorthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="NorthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to NorthAmericaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SouthAmericaMember" xlink:label="SouthAmericaMember" xlink:title="SouthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SouthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to SouthAmericaMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EMEAMember" xlink:label="EMEAMember" xlink:title="EMEAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="EMEAMember" xlink:title="definition: SegmentGeographicalDomain to EMEAMember" order="3.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegmentAssetsAndLiabilitiesByBusinessSectorsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="DisclosureOfOperatingSegmentsLineItems" xlink:title="DisclosureOfOperatingSegmentsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AssetsAbstract" xlink:label="AssetsAbstract" xlink:title="AssetsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="AssetsAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to AssetsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesAbstract" xlink:label="LiabilitiesAbstract" xlink:title="LiabilitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LiabilitiesAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LiabilitiesAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Equity" xlink:label="Equity" xlink:title="Equity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Equity" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Equity" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityAndLiabilities" xlink:label="EquityAndLiabilities" xlink:title="EquityAndLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="EquityAndLiabilities" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to EquityAndLiabilities" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LongTermAndShortTermProjectDebt" xlink:label="LongTermAndShortTermProjectDebt" xlink:title="LongTermAndShortTermProjectDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LongTermAndShortTermProjectDebt" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LongTermAndShortTermProjectDebt" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:label="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LongTermAndShortTermCorporateDebt" xlink:label="LongTermAndShortTermCorporateDebt" xlink:title="LongTermAndShortTermCorporateDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LongTermAndShortTermCorporateDebt" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LongTermAndShortTermCorporateDebt" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LiabilitiesOtherNonCurrent" xlink:label="LiabilitiesOtherNonCurrent" xlink:title="LiabilitiesOtherNonCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LiabilitiesOtherNonCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LiabilitiesOtherNonCurrent" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LiabilitiesOtherCurrent" xlink:label="LiabilitiesOtherCurrent" xlink:title="LiabilitiesOtherCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="LiabilitiesOtherCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to LiabilitiesOtherCurrent" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Liabilities" xlink:label="Liabilities" xlink:title="Liabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Liabilities" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Liabilities" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ContractedConcessionalAssets" xlink:label="ContractedConcessionalAssets" xlink:title="ContractedConcessionalAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="ContractedConcessionalAssets" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to ContractedConcessionalAssets" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:label="InvestmentAccountedForUsingEquityMethod" xlink:title="InvestmentAccountedForUsingEquityMethod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="InvestmentAccountedForUsingEquityMethod" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to InvestmentAccountedForUsingEquityMethod" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentFinancialAssets" xlink:label="CurrentFinancialAssets" xlink:title="CurrentFinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="CurrentFinancialAssets" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to CurrentFinancialAssets" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="CashAndCashEquivalents" xlink:title="CashAndCashEquivalents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="CashAndCashEquivalents" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to CashAndCashEquivalents" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssetsOtherNonCurrent" xlink:label="AssetsOtherNonCurrent" xlink:title="AssetsOtherNonCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="AssetsOtherNonCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to AssetsOtherNonCurrent" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssetsOtherCurrent" xlink:label="AssetsOtherCurrent" xlink:title="AssetsOtherCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="AssetsOtherCurrent" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to AssetsOtherCurrent" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Assets" xlink:label="Assets" xlink:title="Assets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="Assets" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to Assets" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="DisclosureOfOperatingSegmentsTable" xlink:title="DisclosureOfOperatingSegmentsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DisclosureOfOperatingSegmentsTable" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DisclosureOfOperatingSegmentsTable" order="18.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentConsolidationItemsAxis" xlink:label="SegmentConsolidationItemsAxis" xlink:title="SegmentConsolidationItemsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="SegmentConsolidationItemsAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to SegmentConsolidationItemsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="EntitysTotalForSegmentConsolidationItemsMember" xlink:title="EntitysTotalForSegmentConsolidationItemsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="SegmentConsolidationItemsAxis" xlink:to="EntitysTotalForSegmentConsolidationItemsMember" xlink:title="definition: SegmentConsolidationItemsAxis to EntitysTotalForSegmentConsolidationItemsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="EntitysTotalForSegmentConsolidationItemsMember_2" xlink:title="EntitysTotalForSegmentConsolidationItemsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="SegmentConsolidationItemsAxis" xlink:to="EntitysTotalForSegmentConsolidationItemsMember_2" xlink:title="definition: SegmentConsolidationItemsAxis to EntitysTotalForSegmentConsolidationItemsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OperatingSegmentsMember" xlink:label="OperatingSegmentsMember" xlink:title="OperatingSegmentsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForSegmentConsolidationItemsMember" xlink:to="OperatingSegmentsMember" xlink:title="definition: EntitysTotalForSegmentConsolidationItemsMember to OperatingSegmentsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnallocatedAmountsMember" xlink:label="UnallocatedAmountsMember" xlink:title="UnallocatedAmountsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForSegmentConsolidationItemsMember" xlink:to="UnallocatedAmountsMember" xlink:title="definition: EntitysTotalForSegmentConsolidationItemsMember to UnallocatedAmountsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ProductsAndServicesAxis" xlink:title="ProductsAndServicesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="ProductsAndServicesAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to ProductsAndServicesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember_2" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember_2" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RenewableEnergyMember" xlink:label="RenewableEnergyMember" xlink:title="RenewableEnergyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="RenewableEnergyMember" xlink:title="definition: ProductsAndServicesMember to RenewableEnergyMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_EfficientNaturalGasMember" xlink:label="EfficientNaturalGasMember" xlink:title="EfficientNaturalGasMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="EfficientNaturalGasMember" xlink:title="definition: ProductsAndServicesMember to EfficientNaturalGasMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ElectricTransmissionLinesMember" xlink:label="ElectricTransmissionLinesMember" xlink:title="ElectricTransmissionLinesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="ElectricTransmissionLinesMember" xlink:title="definition: ProductsAndServicesMember to ElectricTransmissionLinesMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_WaterMember" xlink:label="WaterMember" xlink:title="WaterMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="WaterMember" xlink:title="definition: ProductsAndServicesMember to WaterMember" order="4.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInformationBySegmentDepreciationAmortizationAndImpairmentChargesRecognizedDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="DisclosureOfOperatingSegmentsLineItems" xlink:title="DisclosureOfOperatingSegmentsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SegmentInformationAbstract" xlink:label="SegmentInformationAbstract" xlink:title="SegmentInformationAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="SegmentInformationAbstract" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to SegmentInformationAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:label="DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:title="DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="DisclosureOfOperatingSegmentsTable" xlink:title="DisclosureOfOperatingSegmentsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfOperatingSegmentsLineItems" xlink:to="DisclosureOfOperatingSegmentsTable" xlink:title="definition: DisclosureOfOperatingSegmentsLineItems to DisclosureOfOperatingSegmentsTable" order="3.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="StatementGeographicalAxis" xlink:title="StatementGeographicalAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="StatementGeographicalAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to StatementGeographicalAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="SegmentGeographicalDomain_2" xlink:title="SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="StatementGeographicalAxis" xlink:to="SegmentGeographicalDomain_2" xlink:title="definition: StatementGeographicalAxis to SegmentGeographicalDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NorthAmericaMember" xlink:label="NorthAmericaMember" xlink:title="NorthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="NorthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to NorthAmericaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SouthAmericaMember" xlink:label="SouthAmericaMember" xlink:title="SouthAmericaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="SouthAmericaMember" xlink:title="definition: SegmentGeographicalDomain to SouthAmericaMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EMEAMember" xlink:label="EMEAMember" xlink:title="EMEAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="SegmentGeographicalDomain" xlink:to="EMEAMember" xlink:title="definition: SegmentGeographicalDomain to EMEAMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="ProductsAndServicesAxis" xlink:title="ProductsAndServicesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfOperatingSegmentsTable" xlink:to="ProductsAndServicesAxis" xlink:title="definition: DisclosureOfOperatingSegmentsTable to ProductsAndServicesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="ProductsAndServicesMember_2" xlink:title="ProductsAndServicesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="ProductsAndServicesAxis" xlink:to="ProductsAndServicesMember_2" xlink:title="definition: ProductsAndServicesAxis to ProductsAndServicesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RenewableEnergyMember" xlink:label="RenewableEnergyMember" xlink:title="RenewableEnergyMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="RenewableEnergyMember" xlink:title="definition: ProductsAndServicesMember to RenewableEnergyMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ElectricTransmissionLinesMember" xlink:label="ElectricTransmissionLinesMember" xlink:title="ElectricTransmissionLinesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ProductsAndServicesMember" xlink:to="ElectricTransmissionLinesMember" xlink:title="definition: ProductsAndServicesMember to ElectricTransmissionLinesMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ChangesInScopeOfConsolidatedCondensedInterimFinancialStatementsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="DisclosureOfBusinessCombinationsLineItems" xlink:title="DisclosureOfBusinessCombinationsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsAbstract" xlink:label="DisclosureOfBusinessCombinationsAbstract" xlink:title="DisclosureOfBusinessCombinationsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="DisclosureOfBusinessCombinationsAbstract" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to DisclosureOfBusinessCombinationsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="PercentageOfVotingEquityInterestsAcquired" xlink:title="PercentageOfVotingEquityInterestsAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="PercentageOfVotingEquityInterestsAcquired" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to PercentageOfVotingEquityInterestsAcquired" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:label="AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:title="AcquisitiondateFairValueOfTotalConsiderationTransferred" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to AcquisitiondateFairValueOfTotalConsiderationTransferred" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="DisclosureOfBusinessCombinationsTable" xlink:title="DisclosureOfBusinessCombinationsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfBusinessCombinationsLineItems" xlink:to="DisclosureOfBusinessCombinationsTable" xlink:title="definition: DisclosureOfBusinessCombinationsLineItems to DisclosureOfBusinessCombinationsTable" order="4.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfBusinessCombinationsTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfBusinessCombinationsTable to IntangibleAssetsMaterialToEntityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_MiniHydroMember" xlink:label="MiniHydroMember" xlink:title="MiniHydroMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="MiniHydroMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to MiniHydroMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ContractedConcessionalAssetsDetails">
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" xlink:label="DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" xlink:title="DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:label="ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:title="ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" xlink:to="ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:title="definition: DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems to ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ContractedConcessionalAssets" xlink:label="ContractedConcessionalAssets" xlink:title="ContractedConcessionalAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" xlink:to="ContractedConcessionalAssets" xlink:title="definition: DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems to ContractedConcessionalAssets" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssets" xlink:label="FinancialAssets" xlink:title="FinancialAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" xlink:to="FinancialAssets" xlink:title="definition: DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems to FinancialAssets" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" xlink:label="ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" xlink:title="ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" xlink:to="ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" xlink:title="definition: DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems to ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DisclosureOfDetailedInformationAboutConcessionalAssetsTable" xlink:label="DisclosureOfDetailedInformationAboutConcessionalAssetsTable" xlink:title="DisclosureOfDetailedInformationAboutConcessionalAssetsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems" xlink:to="DisclosureOfDetailedInformationAboutConcessionalAssetsTable" xlink:title="definition: DisclosureOfDetailedInformationAboutConcessionalAssetsLineItems to DisclosureOfDetailedInformationAboutConcessionalAssetsTable" order="5.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:title="CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutConcessionalAssetsTable" xlink:to="CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutConcessionalAssetsTable to CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="CarryingAmountMember" xlink:title="CarryingAmountMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:to="CarryingAmountMember" xlink:title="definition: CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis to CarryingAmountMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="CarryingAmountMember_2" xlink:title="CarryingAmountMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:to="CarryingAmountMember_2" xlink:title="definition: CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis to CarryingAmountMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="GrossCarryingAmountMember" xlink:title="GrossCarryingAmountMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CarryingAmountMember" xlink:to="GrossCarryingAmountMember" xlink:title="definition: CarryingAmountMember to GrossCarryingAmountMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:label="AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:title="AccumulatedDepreciationAmortisationAndImpairmentMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CarryingAmountMember" xlink:to="AccumulatedDepreciationAmortisationAndImpairmentMember" xlink:title="definition: CarryingAmountMember to AccumulatedDepreciationAmortisationAndImpairmentMember" order="2.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/InvestmentsCarriedUnderEquityMethodDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:label="DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:title="DisclosureOfSignificantInvestmentsInAssociatesLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesAbstract" xlink:label="DisclosureOfSignificantInvestmentsInAssociatesAbstract" xlink:title="DisclosureOfSignificantInvestmentsInAssociatesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:to="DisclosureOfSignificantInvestmentsInAssociatesAbstract" xlink:title="definition: DisclosureOfSignificantInvestmentsInAssociatesLineItems to DisclosureOfSignificantInvestmentsInAssociatesAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:label="InvestmentAccountedForUsingEquityMethod" xlink:title="InvestmentAccountedForUsingEquityMethod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:to="InvestmentAccountedForUsingEquityMethod" xlink:title="definition: DisclosureOfSignificantInvestmentsInAssociatesLineItems to InvestmentAccountedForUsingEquityMethod" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="ProportionOfOwnershipInterestInSubsidiary" xlink:title="ProportionOfOwnershipInterestInSubsidiary" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:to="ProportionOfOwnershipInterestInSubsidiary" xlink:title="definition: DisclosureOfSignificantInvestmentsInAssociatesLineItems to ProportionOfOwnershipInterestInSubsidiary" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable" xlink:label="DisclosureOfSignificantInvestmentsInAssociatesTable" xlink:title="DisclosureOfSignificantInvestmentsInAssociatesTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfSignificantInvestmentsInAssociatesLineItems" xlink:to="DisclosureOfSignificantInvestmentsInAssociatesTable" xlink:title="definition: DisclosureOfSignificantInvestmentsInAssociatesLineItems to DisclosureOfSignificantInvestmentsInAssociatesTable" order="4.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis" xlink:label="SignificantInvestmentsInAssociatesAxis" xlink:title="SignificantInvestmentsInAssociatesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfSignificantInvestmentsInAssociatesTable" xlink:to="SignificantInvestmentsInAssociatesAxis" xlink:title="definition: DisclosureOfSignificantInvestmentsInAssociatesTable to SignificantInvestmentsInAssociatesAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForAssociatesMember" xlink:label="EntitysTotalForAssociatesMember" xlink:title="EntitysTotalForAssociatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="SignificantInvestmentsInAssociatesAxis" xlink:to="EntitysTotalForAssociatesMember" xlink:title="definition: SignificantInvestmentsInAssociatesAxis to EntitysTotalForAssociatesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForAssociatesMember" xlink:label="EntitysTotalForAssociatesMember_2" xlink:title="EntitysTotalForAssociatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="SignificantInvestmentsInAssociatesAxis" xlink:to="EntitysTotalForAssociatesMember_2" xlink:title="definition: SignificantInvestmentsInAssociatesAxis to EntitysTotalForAssociatesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssociatesOneMember" xlink:label="AssociatesOneMember" xlink:title="AssociatesOneMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForAssociatesMember" xlink:to="AssociatesOneMember" xlink:title="definition: EntitysTotalForAssociatesMember to AssociatesOneMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssociatesTwoMember" xlink:label="AssociatesTwoMember" xlink:title="AssociatesTwoMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForAssociatesMember" xlink:to="AssociatesTwoMember" xlink:title="definition: EntitysTotalForAssociatesMember to AssociatesTwoMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssociatesThreeMember" xlink:label="AssociatesThreeMember" xlink:title="AssociatesThreeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForAssociatesMember" xlink:to="AssociatesThreeMember" xlink:title="definition: EntitysTotalForAssociatesMember to AssociatesThreeMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AssociatesFourMember" xlink:label="AssociatesFourMember" xlink:title="AssociatesFourMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForAssociatesMember" xlink:to="AssociatesFourMember" xlink:title="definition: EntitysTotalForAssociatesMember to AssociatesFourMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedIndividuallyImmaterialAssociatesMember" xlink:label="AggregatedIndividuallyImmaterialAssociatesMember" xlink:title="AggregatedIndividuallyImmaterialAssociatesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForAssociatesMember" xlink:to="AggregatedIndividuallyImmaterialAssociatesMember" xlink:title="definition: EntitysTotalForAssociatesMember to AggregatedIndividuallyImmaterialAssociatesMember" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="LegalEntityAxis" xlink:title="LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfSignificantInvestmentsInAssociatesTable" xlink:to="LegalEntityAxis" xlink:title="definition: DisclosureOfSignificantInvestmentsInAssociatesTable to LegalEntityAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="LegalEntityAxis" xlink:to="EntityDomain" xlink:title="definition: LegalEntityAxis to EntityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain_2" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="LegalEntityAxis" xlink:to="EntityDomain_2" xlink:title="definition: LegalEntityAxis to EntityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_GeidaTlemcenSLMember" xlink:label="GeidaTlemcenSLMember" xlink:title="GeidaTlemcenSLMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="GeidaTlemcenSLMember" xlink:title="definition: EntityDomain to GeidaTlemcenSLMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInvestmentsDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialInvestmentsRestructuringAgreementOfAbengoaDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:label="DisclosureOfFinancialAssetsLineItems" xlink:title="DisclosureOfFinancialAssetsLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RestructuringAgreementAbstract" xlink:label="RestructuringAgreementAbstract" xlink:title="RestructuringAgreementAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialAssetsLineItems" xlink:to="RestructuringAgreementAbstract" xlink:title="definition: DisclosureOfFinancialAssetsLineItems to RestructuringAgreementAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="PercentageOfVotingEquityInterestsAcquired" xlink:title="PercentageOfVotingEquityInterestsAcquired" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialAssetsLineItems" xlink:to="PercentageOfVotingEquityInterestsAcquired" xlink:title="definition: DisclosureOfFinancialAssetsLineItems to PercentageOfVotingEquityInterestsAcquired" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LengthOfTransmissionLines" xlink:label="LengthOfTransmissionLines" xlink:title="LengthOfTransmissionLines" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialAssetsLineItems" xlink:to="LengthOfTransmissionLines" xlink:title="definition: DisclosureOfFinancialAssetsLineItems to LengthOfTransmissionLines" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinancialAssetsTable" xlink:label="DisclosureOfFinancialAssetsTable" xlink:title="DisclosureOfFinancialAssetsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfFinancialAssetsLineItems" xlink:to="DisclosureOfFinancialAssetsTable" xlink:title="definition: DisclosureOfFinancialAssetsLineItems to DisclosureOfFinancialAssetsTable" order="4.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfFinancialAssetsAxis" xlink:label="TypesOfFinancialAssetsAxis" xlink:title="TypesOfFinancialAssetsAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfFinancialAssetsTable" xlink:to="TypesOfFinancialAssetsAxis" xlink:title="definition: DisclosureOfFinancialAssetsTable to TypesOfFinancialAssetsAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsTypeMember" xlink:label="FinancialAssetsTypeMember" xlink:title="FinancialAssetsTypeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="TypesOfFinancialAssetsAxis" xlink:to="FinancialAssetsTypeMember" xlink:title="definition: TypesOfFinancialAssetsAxis to FinancialAssetsTypeMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsTypeMember" xlink:label="FinancialAssetsTypeMember_2" xlink:title="FinancialAssetsTypeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="TypesOfFinancialAssetsAxis" xlink:to="FinancialAssetsTypeMember_2" xlink:title="definition: TypesOfFinancialAssetsAxis to FinancialAssetsTypeMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_TenWestLinkMember" xlink:label="TenWestLinkMember" xlink:title="TenWestLinkMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="FinancialAssetsTypeMember" xlink:to="TenWestLinkMember" xlink:title="definition: FinancialAssetsTypeMember to TenWestLinkMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/DerivativeFinancialInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:label="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:title="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsAbstract" xlink:label="DisclosureOfDetailedInformationAboutHedgingInstrumentsAbstract" xlink:title="DisclosureOfDetailedInformationAboutHedgingInstrumentsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:to="DisclosureOfDetailedInformationAboutHedgingInstrumentsAbstract" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems to DisclosureOfDetailedInformationAboutHedgingInstrumentsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_HedgingInstrumentAssets" xlink:label="HedgingInstrumentAssets" xlink:title="HedgingInstrumentAssets" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:to="HedgingInstrumentAssets" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems to HedgingInstrumentAssets" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_HedgingInstrumentLiabilities" xlink:label="HedgingInstrumentLiabilities" xlink:title="HedgingInstrumentLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:to="HedgingInstrumentLiabilities" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems to HedgingInstrumentLiabilities" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax" xlink:label="GainsLossesOnCashFlowHedgesBeforeTax" xlink:title="GainsLossesOnCashFlowHedgesBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:to="GainsLossesOnCashFlowHedgesBeforeTax" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems to GainsLossesOnCashFlowHedgesBeforeTax" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness" xlink:label="GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness" xlink:title="GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:to="GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems to GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReserveOfCashFlowHedgesContinuingHedges" xlink:label="ReserveOfCashFlowHedgesContinuingHedges" xlink:title="ReserveOfCashFlowHedgesContinuingHedges" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:to="ReserveOfCashFlowHedgesContinuingHedges" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems to ReserveOfCashFlowHedgesContinuingHedges" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable" xlink:label="DisclosureOfDetailedInformationAboutHedgingInstrumentsTable" xlink:title="DisclosureOfDetailedInformationAboutHedgingInstrumentsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems" xlink:to="DisclosureOfDetailedInformationAboutHedgingInstrumentsTable" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems to DisclosureOfDetailedInformationAboutHedgingInstrumentsTable" order="7.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="TypesOfRisksAxis" xlink:title="TypesOfRisksAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsTable" xlink:to="TypesOfRisksAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsTable to TypesOfRisksAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="TypesOfRisksMember" xlink:title="TypesOfRisksMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="TypesOfRisksAxis" xlink:to="TypesOfRisksMember" xlink:title="definition: TypesOfRisksAxis to TypesOfRisksMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="TypesOfRisksMember_2" xlink:title="TypesOfRisksMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="TypesOfRisksAxis" xlink:to="TypesOfRisksMember_2" xlink:title="definition: TypesOfRisksAxis to TypesOfRisksMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MarketRiskMember" xlink:label="MarketRiskMember" xlink:title="MarketRiskMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TypesOfRisksMember" xlink:to="MarketRiskMember" xlink:title="definition: TypesOfRisksMember to MarketRiskMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateRiskMember" xlink:label="InterestRateRiskMember" xlink:title="InterestRateRiskMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="MarketRiskMember" xlink:to="InterestRateRiskMember" xlink:title="definition: MarketRiskMember to InterestRateRiskMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfHedgesAxis" xlink:label="TypesOfHedgesAxis" xlink:title="TypesOfHedgesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutHedgingInstrumentsTable" xlink:to="TypesOfHedgesAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutHedgingInstrumentsTable to TypesOfHedgesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfHedgesMember" xlink:label="TypesOfHedgesMember" xlink:title="TypesOfHedgesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="TypesOfHedgesAxis" xlink:to="TypesOfHedgesMember" xlink:title="definition: TypesOfHedgesAxis to TypesOfHedgesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfHedgesMember" xlink:label="TypesOfHedgesMember_2" xlink:title="TypesOfHedgesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="TypesOfHedgesAxis" xlink:to="TypesOfHedgesMember_2" xlink:title="definition: TypesOfHedgesAxis to TypesOfHedgesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashFlowHedgesMember" xlink:label="CashFlowHedgesMember" xlink:title="CashFlowHedgesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="TypesOfHedgesMember" xlink:to="CashFlowHedgesMember" xlink:title="definition: TypesOfHedgesMember to CashFlowHedgesMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/RelatedPartiesDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:label="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:title="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DetailsOfBalancesWithRelatedPartiesAbstract" xlink:label="DetailsOfBalancesWithRelatedPartiesAbstract" xlink:title="DetailsOfBalancesWithRelatedPartiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="DetailsOfBalancesWithRelatedPartiesAbstract" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to DetailsOfBalancesWithRelatedPartiesAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_TransactionsWithRelatedPartyAbstract" xlink:label="TransactionsWithRelatedPartyAbstract" xlink:title="TransactionsWithRelatedPartyAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="TransactionsWithRelatedPartyAbstract" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to TransactionsWithRelatedPartyAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RevenueFromRenderingOfServicesRelatedPartyTransactions" xlink:label="RevenueFromRenderingOfServicesRelatedPartyTransactions" xlink:title="RevenueFromRenderingOfServicesRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="RevenueFromRenderingOfServicesRelatedPartyTransactions" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to RevenueFromRenderingOfServicesRelatedPartyTransactions" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ServicesReceivedRelatedPartyTransactions" xlink:label="ServicesReceivedRelatedPartyTransactions" xlink:title="ServicesReceivedRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="ServicesReceivedRelatedPartyTransactions" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to ServicesReceivedRelatedPartyTransactions" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinanceIncome" xlink:label="FinanceIncome" xlink:title="FinanceIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="FinanceIncome" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to FinanceIncome" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinanceCosts" xlink:label="FinanceCosts" xlink:title="FinanceCosts" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="FinanceCosts" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to FinanceCosts" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentPayablesToTradeSuppliers" xlink:label="NoncurrentPayablesToTradeSuppliers" xlink:title="NoncurrentPayablesToTradeSuppliers" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="NoncurrentPayablesToTradeSuppliers" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to NoncurrentPayablesToTradeSuppliers" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PaymentsToSuppliersForGoodsAndServices" xlink:label="PaymentsToSuppliersForGoodsAndServices" xlink:title="PaymentsToSuppliersForGoodsAndServices" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="PaymentsToSuppliersForGoodsAndServices" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to PaymentsToSuppliersForGoodsAndServices" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DividendsRetained" xlink:label="DividendsRetained" xlink:title="DividendsRetained" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="DividendsRetained" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to DividendsRetained" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_MinimumOwnershipRequirementPercentage" xlink:label="MinimumOwnershipRequirementPercentage" xlink:title="MinimumOwnershipRequirementPercentage" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="MinimumOwnershipRequirementPercentage" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to MinimumOwnershipRequirementPercentage" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PerformanceObligationsConsiderationReceivable" xlink:label="PerformanceObligationsConsiderationReceivable" xlink:title="PerformanceObligationsConsiderationReceivable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="PerformanceObligationsConsiderationReceivable" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to PerformanceObligationsConsiderationReceivable" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PerformanceObligationsProceedsEstimatedPrepaidAmountProjectDebt" xlink:label="PerformanceObligationsProceedsEstimatedPrepaidAmountProjectDebt" xlink:title="PerformanceObligationsProceedsEstimatedPrepaidAmountProjectDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="PerformanceObligationsProceedsEstimatedPrepaidAmountProjectDebt" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to PerformanceObligationsProceedsEstimatedPrepaidAmountProjectDebt" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PerformanceObligationsProceedsAmountUsedForAdditionalRepairsOfThePlant" xlink:label="PerformanceObligationsProceedsAmountUsedForAdditionalRepairsOfThePlant" xlink:title="PerformanceObligationsProceedsAmountUsedForAdditionalRepairsOfThePlant" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="PerformanceObligationsProceedsAmountUsedForAdditionalRepairsOfThePlant" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to PerformanceObligationsProceedsAmountUsedForAdditionalRepairsOfThePlant" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_OtherContingentObligations" xlink:label="OtherContingentObligations" xlink:title="OtherContingentObligations" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="OtherContingentObligations" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to OtherContingentObligations" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_RecognitionPeriodOfOtherContingentObligationsConsidered" xlink:label="RecognitionPeriodOfOtherContingentObligationsConsidered" xlink:title="RecognitionPeriodOfOtherContingentObligationsConsidered" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="RecognitionPeriodOfOtherContingentObligationsConsidered" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to RecognitionPeriodOfOtherContingentObligationsConsidered" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_PerformanceObligationsReceivedFromRelatedPartyTransactions" xlink:label="PerformanceObligationsReceivedFromRelatedPartyTransactions" xlink:title="PerformanceObligationsReceivedFromRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="PerformanceObligationsReceivedFromRelatedPartyTransactions" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to PerformanceObligationsReceivedFromRelatedPartyTransactions" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:title="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to RepaymentsOfBorrowingsClassifiedAsFinancingActivities" order="17.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_TermToMaintainGuaranteesAndLettersOfCredit" xlink:label="TermToMaintainGuaranteesAndLettersOfCredit" xlink:title="TermToMaintainGuaranteesAndLettersOfCredit" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="TermToMaintainGuaranteesAndLettersOfCredit" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to TermToMaintainGuaranteesAndLettersOfCredit" order="18.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_GuaranteesAmountRelatedPartyTransactions" xlink:label="GuaranteesAmountRelatedPartyTransactions" xlink:title="GuaranteesAmountRelatedPartyTransactions" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="GuaranteesAmountRelatedPartyTransactions" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to GuaranteesAmountRelatedPartyTransactions" order="19.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ReplacementOfGuaranteesAmount" xlink:label="ReplacementOfGuaranteesAmount" xlink:title="ReplacementOfGuaranteesAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="ReplacementOfGuaranteesAmount" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to ReplacementOfGuaranteesAmount" order="20.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties" xlink:label="TradeAndOtherCurrentReceivablesDueFromRelatedParties" xlink:title="TradeAndOtherCurrentReceivablesDueFromRelatedParties" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="TradeAndOtherCurrentReceivablesDueFromRelatedParties" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to TradeAndOtherCurrentReceivablesDueFromRelatedParties" order="21.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentReceivablesDueFromRelatedParties" xlink:label="NoncurrentReceivablesDueFromRelatedParties" xlink:title="NoncurrentReceivablesDueFromRelatedParties" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="NoncurrentReceivablesDueFromRelatedParties" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to NoncurrentReceivablesDueFromRelatedParties" order="22.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties" xlink:label="TradeAndOtherCurrentPayablesToRelatedParties" xlink:title="TradeAndOtherCurrentPayablesToRelatedParties" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="TradeAndOtherCurrentPayablesToRelatedParties" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to TradeAndOtherCurrentPayablesToRelatedParties" order="23.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentPayablesToRelatedParties" xlink:label="NoncurrentPayablesToRelatedParties" xlink:title="NoncurrentPayablesToRelatedParties" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="NoncurrentPayablesToRelatedParties" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to NoncurrentPayablesToRelatedParties" order="24.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:label="DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:title="DisclosureOfTransactionsBetweenRelatedPartiesTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:to="DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesLineItems to DisclosureOfTransactionsBetweenRelatedPartiesTable" order="25.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="CategoriesOfRelatedPartiesAxis" xlink:title="CategoriesOfRelatedPartiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:to="CategoriesOfRelatedPartiesAxis" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesTable to CategoriesOfRelatedPartiesAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="EntitysTotalForRelatedPartiesMember" xlink:title="EntitysTotalForRelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="CategoriesOfRelatedPartiesAxis" xlink:to="EntitysTotalForRelatedPartiesMember" xlink:title="definition: CategoriesOfRelatedPartiesAxis to EntitysTotalForRelatedPartiesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="EntitysTotalForRelatedPartiesMember_2" xlink:title="EntitysTotalForRelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="CategoriesOfRelatedPartiesAxis" xlink:to="EntitysTotalForRelatedPartiesMember_2" xlink:title="definition: CategoriesOfRelatedPartiesAxis to EntitysTotalForRelatedPartiesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RelatedPartiesMember" xlink:label="RelatedPartiesMember" xlink:title="RelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForRelatedPartiesMember" xlink:to="RelatedPartiesMember" xlink:title="definition: EntitysTotalForRelatedPartiesMember to RelatedPartiesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SubsidiariesMember" xlink:label="SubsidiariesMember" xlink:title="SubsidiariesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RelatedPartiesMember" xlink:to="SubsidiariesMember" xlink:title="definition: RelatedPartiesMember to SubsidiariesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AbengoaSAMember" xlink:label="AbengoaSAMember" xlink:title="AbengoaSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RelatedPartiesMember" xlink:to="AbengoaSAMember" xlink:title="definition: RelatedPartiesMember to AbengoaSAMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesTable to IntangibleAssetsMaterialToEntityAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SolanaMember" xlink:label="SolanaMember" xlink:title="SolanaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SolanaMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SolanaMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SolanaAndMojaveMember" xlink:label="SolanaAndMojaveMember" xlink:title="SolanaAndMojaveMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SolanaAndMojaveMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SolanaAndMojaveMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:label="NonadjustingEventsAfterReportingPeriodAxis" xlink:title="NonadjustingEventsAfterReportingPeriodAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:to="NonadjustingEventsAfterReportingPeriodAxis" xlink:title="definition: DisclosureOfTransactionsBetweenRelatedPartiesTable to NonadjustingEventsAfterReportingPeriodAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NonadjustingEventsMember" xlink:label="NonadjustingEventsMember" xlink:title="NonadjustingEventsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="NonadjustingEventsAfterReportingPeriodAxis" xlink:to="NonadjustingEventsMember" xlink:title="definition: NonadjustingEventsAfterReportingPeriodAxis to NonadjustingEventsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NonadjustingEventsMember" xlink:label="NonadjustingEventsMember_2" xlink:title="NonadjustingEventsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="NonadjustingEventsAfterReportingPeriodAxis" xlink:to="NonadjustingEventsMember_2" xlink:title="definition: NonadjustingEventsAfterReportingPeriodAxis to NonadjustingEventsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SubsequentEventsMember" xlink:label="SubsequentEventsMember" xlink:title="SubsequentEventsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NonadjustingEventsMember" xlink:to="SubsequentEventsMember" xlink:title="definition: NonadjustingEventsMember to SubsequentEventsMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ClientsAndOtherReceivableDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/EquityDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems" xlink:label="DisclosureOfClassesOfShareCapitalLineItems" xlink:title="DisclosureOfClassesOfShareCapitalLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalAbstract" xlink:label="DisclosureOfClassesOfShareCapitalAbstract" xlink:title="DisclosureOfClassesOfShareCapitalAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="DisclosureOfClassesOfShareCapitalAbstract" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to DisclosureOfClassesOfShareCapitalAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IssuedCapital" xlink:label="IssuedCapital" xlink:title="IssuedCapital" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="IssuedCapital" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to IssuedCapital" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:label="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:title="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfSharesOutstanding" xlink:label="NumberOfSharesOutstanding" xlink:title="NumberOfSharesOutstanding" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="NumberOfSharesOutstanding" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to NumberOfSharesOutstanding" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ParValuePerShare" xlink:label="ParValuePerShare" xlink:title="ParValuePerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="ParValuePerShare" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to ParValuePerShare" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_VotingRightPerShare" xlink:label="VotingRightPerShare" xlink:title="VotingRightPerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="VotingRightPerShare" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to VotingRightPerShare" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DividendsPaidOrdinarySharesPerShare" xlink:label="DividendsPaidOrdinarySharesPerShare" xlink:title="DividendsPaidOrdinarySharesPerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="DividendsPaidOrdinarySharesPerShare" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to DividendsPaidOrdinarySharesPerShare" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_TreasurySharesNumberOfShares" xlink:label="TreasurySharesNumberOfShares" xlink:title="TreasurySharesNumberOfShares" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="TreasurySharesNumberOfShares" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to TreasurySharesNumberOfShares" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NumberOfTreasurySharesPurchasedSoldIssuedOrCancelled" xlink:label="NumberOfTreasurySharesPurchasedSoldIssuedOrCancelled" xlink:title="NumberOfTreasurySharesPurchasedSoldIssuedOrCancelled" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="NumberOfTreasurySharesPurchasedSoldIssuedOrCancelled" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to NumberOfTreasurySharesPurchasedSoldIssuedOrCancelled" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable" xlink:label="DisclosureOfClassesOfShareCapitalTable" xlink:title="DisclosureOfClassesOfShareCapitalTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfClassesOfShareCapitalLineItems" xlink:to="DisclosureOfClassesOfShareCapitalTable" xlink:title="definition: DisclosureOfClassesOfShareCapitalLineItems to DisclosureOfClassesOfShareCapitalTable" order="10.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="LegalEntityAxis" xlink:title="LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfClassesOfShareCapitalTable" xlink:to="LegalEntityAxis" xlink:title="definition: DisclosureOfClassesOfShareCapitalTable to LegalEntityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="LegalEntityAxis" xlink:to="EntityDomain" xlink:title="definition: LegalEntityAxis to EntityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain_2" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="LegalEntityAxis" xlink:to="EntityDomain_2" xlink:title="definition: LegalEntityAxis to EntityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AbengoaSAMember" xlink:label="AbengoaSAMember" xlink:title="AbengoaSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="AbengoaSAMember" xlink:title="definition: EntityDomain to AbengoaSAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AlgonquinMember" xlink:label="AlgonquinMember" xlink:title="AlgonquinMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="AlgonquinMember" xlink:title="definition: EntityDomain to AlgonquinMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="MaturityAxis" xlink:title="MaturityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfClassesOfShareCapitalTable" xlink:to="MaturityAxis" xlink:title="definition: DisclosureOfClassesOfShareCapitalTable to MaturityAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="AggregatedTimeBandsMember" xlink:title="AggregatedTimeBandsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="MaturityAxis" xlink:to="AggregatedTimeBandsMember" xlink:title="definition: MaturityAxis to AggregatedTimeBandsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="AggregatedTimeBandsMember_2" xlink:title="AggregatedTimeBandsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="MaturityAxis" xlink:to="AggregatedTimeBandsMember_2" xlink:title="definition: MaturityAxis to AggregatedTimeBandsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LaterThanNineMonthsAndNotLaterThanTwelveMonthsMember" xlink:label="LaterThanNineMonthsAndNotLaterThanTwelveMonthsMember" xlink:title="LaterThanNineMonthsAndNotLaterThanTwelveMonthsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanNineMonthsAndNotLaterThanTwelveMonthsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanNineMonthsAndNotLaterThanTwelveMonthsMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/CorporateDebtBreakdownOfCorporateDebtDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfDetailedInformationAboutBorrowingsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NonCurrentPortionOfCreditFacilitiesNotesAndBondsReceived" xlink:label="NonCurrentPortionOfCreditFacilitiesNotesAndBondsReceived" xlink:title="NonCurrentPortionOfCreditFacilitiesNotesAndBondsReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="NonCurrentPortionOfCreditFacilitiesNotesAndBondsReceived" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to NonCurrentPortionOfCreditFacilitiesNotesAndBondsReceived" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" xlink:label="CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" xlink:title="CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LongTermAndShortTermCorporateDebt" xlink:label="LongTermAndShortTermCorporateDebt" xlink:title="LongTermAndShortTermCorporateDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="LongTermAndShortTermCorporateDebt" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to LongTermAndShortTermCorporateDebt" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotionalAmount" xlink:label="NotionalAmount" xlink:title="NotionalAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="NotionalAmount" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to NotionalAmount" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NumberOfInterestRateSwaps" xlink:label="NumberOfInterestRateSwaps" xlink:title="NumberOfInterestRateSwaps" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="NumberOfInterestRateSwaps" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to NumberOfInterestRateSwaps" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsMaturity" xlink:label="BorrowingsMaturity" xlink:title="BorrowingsMaturity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="BorrowingsMaturity" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to BorrowingsMaturity" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:label="BorrowingsAdjustmentToInterestRateBasis" xlink:title="BorrowingsAdjustmentToInterestRateBasis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="BorrowingsAdjustmentToInterestRateBasis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to BorrowingsAdjustmentToInterestRateBasis" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsInterestRate" xlink:label="BorrowingsInterestRate" xlink:title="BorrowingsInterestRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="BorrowingsInterestRate" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to BorrowingsInterestRate" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfDetailedInformationAboutBorrowingsTable" order="10.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="BorrowingsByNameAxis" xlink:title="BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="BorrowingsByNameAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to BorrowingsByNameAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember_2" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember_2" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoteIssuanceFacilityMember" xlink:label="NoteIssuanceFacilityMember" xlink:title="NoteIssuanceFacilityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="NoteIssuanceFacilityMember" xlink:title="definition: BorrowingsByNameMember to NoteIssuanceFacilityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Series1NotesMember" xlink:label="Series1NotesMember" xlink:title="Series1NotesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NoteIssuanceFacilityMember" xlink:to="Series1NotesMember" xlink:title="definition: NoteIssuanceFacilityMember to Series1NotesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Series2NotesMember" xlink:label="Series2NotesMember" xlink:title="Series2NotesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NoteIssuanceFacilityMember" xlink:to="Series2NotesMember" xlink:title="definition: NoteIssuanceFacilityMember to Series2NotesMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_Series3NotesMember" xlink:label="Series3NotesMember" xlink:title="Series3NotesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NoteIssuanceFacilityMember" xlink:to="Series3NotesMember" xlink:title="definition: NoteIssuanceFacilityMember to Series3NotesMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfInterestRatesAxis" xlink:label="TypesOfInterestRatesAxis" xlink:title="TypesOfInterestRatesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="TypesOfInterestRatesAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to TypesOfInterestRatesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="InterestRateTypesMember" xlink:title="InterestRateTypesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="TypesOfInterestRatesAxis" xlink:to="InterestRateTypesMember" xlink:title="definition: TypesOfInterestRatesAxis to InterestRateTypesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="InterestRateTypesMember_2" xlink:title="InterestRateTypesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="TypesOfInterestRatesAxis" xlink:to="InterestRateTypesMember_2" xlink:title="definition: TypesOfInterestRatesAxis to InterestRateTypesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_EuroInterbankOfferedRateMember" xlink:label="EuroInterbankOfferedRateMember" xlink:title="EuroInterbankOfferedRateMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InterestRateTypesMember" xlink:to="EuroInterbankOfferedRateMember" xlink:title="definition: InterestRateTypesMember to EuroInterbankOfferedRateMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/CorporateDebtRepaymentScheduleDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" xlink:label="DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" xlink:title="DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LongTermAndShortTermCorporateDebt" xlink:label="LongTermAndShortTermCorporateDebt" xlink:title="LongTermAndShortTermCorporateDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="LongTermAndShortTermCorporateDebt" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to LongTermAndShortTermCorporateDebt" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfDetailedInformationAboutBorrowingsTable" order="3.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="BorrowingsByNameAxis" xlink:title="BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="BorrowingsByNameAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to BorrowingsByNameAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember_2" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember_2" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CreditFacilityTrancheAMember" xlink:label="CreditFacilityTrancheAMember" xlink:title="CreditFacilityTrancheAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="CreditFacilityTrancheAMember" xlink:title="definition: BorrowingsByNameMember to CreditFacilityTrancheAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoteIssuanceFacilityMember" xlink:label="NoteIssuanceFacilityMember" xlink:title="NoteIssuanceFacilityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="NoteIssuanceFacilityMember" xlink:title="definition: BorrowingsByNameMember to NoteIssuanceFacilityMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CreditFacility2017Member" xlink:label="CreditFacility2017Member" xlink:title="CreditFacility2017Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="CreditFacility2017Member" xlink:title="definition: BorrowingsByNameMember to CreditFacility2017Member" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NotesSeniorMember" xlink:label="NotesSeniorMember" xlink:title="NotesSeniorMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="NotesSeniorMember" xlink:title="definition: BorrowingsByNameMember to NotesSeniorMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="MaturityAxis" xlink:title="MaturityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="MaturityAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to MaturityAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="AggregatedTimeBandsMember" xlink:title="AggregatedTimeBandsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="MaturityAxis" xlink:to="AggregatedTimeBandsMember" xlink:title="definition: MaturityAxis to AggregatedTimeBandsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="AggregatedTimeBandsMember_2" xlink:title="AggregatedTimeBandsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="MaturityAxis" xlink:to="AggregatedTimeBandsMember_2" xlink:title="definition: MaturityAxis to AggregatedTimeBandsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="NotLaterThanOneYearMember" xlink:title="NotLaterThanOneYearMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="NotLaterThanOneYearMember" xlink:title="definition: AggregatedTimeBandsMember to NotLaterThanOneYearMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneMonthAndNotLaterThanThreeMonthsMember" xlink:label="LaterThanOneMonthAndNotLaterThanThreeMonthsMember" xlink:title="LaterThanOneMonthAndNotLaterThanThreeMonthsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanOneMonthAndNotLaterThanThreeMonthsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanOneMonthAndNotLaterThanThreeMonthsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:label="LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:title="LaterThanThreeMonthsAndNotLaterThanOneYearMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanThreeMonthsAndNotLaterThanOneYearMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:label="LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:title="LaterThanTwoYearsAndNotLaterThanThreeYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanTwoYearsAndNotLaterThanThreeYearsMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:label="LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:title="LaterThanThreeYearsAndNotLaterThanFourYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanThreeYearsAndNotLaterThanFourYearsMember" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:label="LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:title="LaterThanFourYearsAndNotLaterThanFiveYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanFourYearsAndNotLaterThanFiveYearsMember" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="LaterThanFiveYearsMember" xlink:title="LaterThanFiveYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanFiveYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanFiveYearsMember" order="7.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/CorporateDebtDetailsOfCorporateDebtDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfDetailedInformationAboutBorrowingsAbstract" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfDetailedInformationAboutBorrowingsAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotionalAmount" xlink:label="NotionalAmount" xlink:title="NotionalAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="NotionalAmount" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to NotionalAmount" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsInterestRate" xlink:label="BorrowingsInterestRate" xlink:title="BorrowingsInterestRate" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="BorrowingsInterestRate" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to BorrowingsInterestRate" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsMaturity" xlink:label="BorrowingsMaturity" xlink:title="BorrowingsMaturity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="BorrowingsMaturity" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to BorrowingsMaturity" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:label="ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:title="ProceedsFromBorrowingsClassifiedAsFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to ProceedsFromBorrowingsClassifiedAsFinancingActivities" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsAdjustmentToInterestRateBasis" xlink:label="BorrowingsAdjustmentToInterestRateBasis" xlink:title="BorrowingsAdjustmentToInterestRateBasis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="BorrowingsAdjustmentToInterestRateBasis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to BorrowingsAdjustmentToInterestRateBasis" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:title="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to RepaymentsOfBorrowingsClassifiedAsFinancingActivities" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" xlink:label="CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" xlink:title="CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to CurrentPortionOfNoncurrentCreditFacilitiesNotesAndBondsReceived" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfDetailedInformationAboutBorrowingsTable" order="9.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="BorrowingsByNameAxis" xlink:title="BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="BorrowingsByNameAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to BorrowingsByNameAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember_2" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember_2" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NotesSeniorMember" xlink:label="NotesSeniorMember" xlink:title="NotesSeniorMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="NotesSeniorMember" xlink:title="definition: BorrowingsByNameMember to NotesSeniorMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CreditFacilityTrancheAMember" xlink:label="CreditFacilityTrancheAMember" xlink:title="CreditFacilityTrancheAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="CreditFacilityTrancheAMember" xlink:title="definition: BorrowingsByNameMember to CreditFacilityTrancheAMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_CreditFacility2017Member" xlink:label="CreditFacility2017Member" xlink:title="CreditFacility2017Member" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="CreditFacility2017Member" xlink:title="definition: BorrowingsByNameMember to CreditFacility2017Member" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_EurodollarRateLoansMember" xlink:label="EurodollarRateLoansMember" xlink:title="EurodollarRateLoansMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditFacilityTrancheAMember" xlink:to="EurodollarRateLoansMember" xlink:title="definition: CreditFacilityTrancheAMember to EurodollarRateLoansMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_BaseRateLoansMember" xlink:label="BaseRateLoansMember" xlink:title="BaseRateLoansMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CreditFacilityTrancheAMember" xlink:to="BaseRateLoansMember" xlink:title="definition: CreditFacilityTrancheAMember to BaseRateLoansMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfInterestRatesAxis" xlink:label="TypesOfInterestRatesAxis" xlink:title="TypesOfInterestRatesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="TypesOfInterestRatesAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to TypesOfInterestRatesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="InterestRateTypesMember" xlink:title="InterestRateTypesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="TypesOfInterestRatesAxis" xlink:to="InterestRateTypesMember" xlink:title="definition: TypesOfInterestRatesAxis to InterestRateTypesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="InterestRateTypesMember_2" xlink:title="InterestRateTypesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="TypesOfInterestRatesAxis" xlink:to="InterestRateTypesMember_2" xlink:title="definition: TypesOfInterestRatesAxis to InterestRateTypesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_EuroInterbankOfferedRateMember" xlink:label="EuroInterbankOfferedRateMember" xlink:title="EuroInterbankOfferedRateMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InterestRateTypesMember" xlink:to="EuroInterbankOfferedRateMember" xlink:title="definition: InterestRateTypesMember to EuroInterbankOfferedRateMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FederalFundsRateMember" xlink:label="FederalFundsRateMember" xlink:title="FederalFundsRateMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InterestRateTypesMember" xlink:to="FederalFundsRateMember" xlink:title="definition: InterestRateTypesMember to FederalFundsRateMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LondonInterbankOfferedRateMember" xlink:label="LondonInterbankOfferedRateMember" xlink:title="LondonInterbankOfferedRateMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InterestRateTypesMember" xlink:to="LondonInterbankOfferedRateMember" xlink:title="definition: InterestRateTypesMember to LondonInterbankOfferedRateMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="RangeAxis" xlink:title="RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="RangeAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to RangeAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="RangesMember" xlink:title="RangesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="RangeAxis" xlink:to="RangesMember" xlink:title="definition: RangeAxis to RangesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="RangesMember_2" xlink:title="RangesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="RangeAxis" xlink:to="RangesMember_2" xlink:title="definition: RangeAxis to RangesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="TopOfRangeMember" xlink:title="TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RangesMember" xlink:to="TopOfRangeMember" xlink:title="definition: RangesMember to TopOfRangeMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ProjectDebtDetailsOfProjectDebtDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/ProjectDebtRepaymentScheduleDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" xlink:label="DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" xlink:title="DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:title="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to RepaymentsOfBorrowingsClassifiedAsFinancingActivities" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentInterestPayable" xlink:label="CurrentInterestPayable" xlink:title="CurrentInterestPayable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="CurrentInterestPayable" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to CurrentInterestPayable" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotionalAmount" xlink:label="NotionalAmount" xlink:title="NotionalAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="NotionalAmount" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to NotionalAmount" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LongTermAndShortTermProjectDebt" xlink:label="LongTermAndShortTermProjectDebt" xlink:title="LongTermAndShortTermProjectDebt" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="LongTermAndShortTermProjectDebt" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to LongTermAndShortTermProjectDebt" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="DisclosureOfDetailedInformationAboutBorrowingsTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:to="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsLineItems to DisclosureOfDetailedInformationAboutBorrowingsTable" order="6.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="MaturityAxis" xlink:title="MaturityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="MaturityAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to MaturityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="AggregatedTimeBandsMember" xlink:title="AggregatedTimeBandsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="MaturityAxis" xlink:to="AggregatedTimeBandsMember" xlink:title="definition: MaturityAxis to AggregatedTimeBandsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="AggregatedTimeBandsMember_2" xlink:title="AggregatedTimeBandsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="MaturityAxis" xlink:to="AggregatedTimeBandsMember_2" xlink:title="definition: MaturityAxis to AggregatedTimeBandsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="NotLaterThanOneYearMember" xlink:title="NotLaterThanOneYearMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="NotLaterThanOneYearMember" xlink:title="definition: AggregatedTimeBandsMember to NotLaterThanOneYearMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneMonthAndNotLaterThanThreeMonthsMember" xlink:label="LaterThanOneMonthAndNotLaterThanThreeMonthsMember" xlink:title="LaterThanOneMonthAndNotLaterThanThreeMonthsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanOneMonthAndNotLaterThanThreeMonthsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanOneMonthAndNotLaterThanThreeMonthsMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:label="LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:title="LaterThanThreeMonthsAndNotLaterThanOneYearMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanThreeMonthsAndNotLaterThanOneYearMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanThreeMonthsAndNotLaterThanOneYearMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:label="LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:title="LaterThanTwoYearsAndNotLaterThanThreeYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanTwoYearsAndNotLaterThanThreeYearsMember" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:label="LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:title="LaterThanThreeYearsAndNotLaterThanFourYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanThreeYearsAndNotLaterThanFourYearsMember" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:label="LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:title="LaterThanFourYearsAndNotLaterThanFiveYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanFourYearsAndNotLaterThanFiveYearsMember" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="LaterThanFiveYearsMember" xlink:title="LaterThanFiveYearsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AggregatedTimeBandsMember" xlink:to="LaterThanFiveYearsMember" xlink:title="definition: AggregatedTimeBandsMember to LaterThanFiveYearsMember" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="CategoriesOfRelatedPartiesAxis" xlink:title="CategoriesOfRelatedPartiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="CategoriesOfRelatedPartiesAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to CategoriesOfRelatedPartiesAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="EntitysTotalForRelatedPartiesMember" xlink:title="EntitysTotalForRelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="CategoriesOfRelatedPartiesAxis" xlink:to="EntitysTotalForRelatedPartiesMember" xlink:title="definition: CategoriesOfRelatedPartiesAxis to EntitysTotalForRelatedPartiesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="EntitysTotalForRelatedPartiesMember_2" xlink:title="EntitysTotalForRelatedPartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="CategoriesOfRelatedPartiesAxis" xlink:to="EntitysTotalForRelatedPartiesMember_2" xlink:title="definition: CategoriesOfRelatedPartiesAxis to EntitysTotalForRelatedPartiesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AbengoaSAMember" xlink:label="AbengoaSAMember" xlink:title="AbengoaSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntitysTotalForRelatedPartiesMember" xlink:to="AbengoaSAMember" xlink:title="definition: EntitysTotalForRelatedPartiesMember to AbengoaSAMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfDetailedInformationAboutBorrowingsTable to IntangibleAssetsMaterialToEntityAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SolanaMember" xlink:label="SolanaMember" xlink:title="SolanaMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SolanaMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SolanaMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/GrantsAndOtherLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinancialLiabilitiesLineItems" xlink:label="DisclosureOfFinancialLiabilitiesLineItems" xlink:title="DisclosureOfFinancialLiabilitiesLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinancialLiabilitiesAbstract" xlink:label="DisclosureOfFinancialLiabilitiesAbstract" xlink:title="DisclosureOfFinancialLiabilitiesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="DisclosureOfFinancialLiabilitiesAbstract" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to DisclosureOfFinancialLiabilitiesAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentGovernmentGrants" xlink:label="NoncurrentGovernmentGrants" xlink:title="NoncurrentGovernmentGrants" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="NoncurrentGovernmentGrants" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to NoncurrentGovernmentGrants" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherNoncurrentLiabilities" xlink:label="OtherNoncurrentLiabilities" xlink:title="OtherNoncurrentLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="OtherNoncurrentLiabilities" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to OtherNoncurrentLiabilities" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:label="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to NoncurrentGovernmentGrantsAndOtherNoncurrentFinancialLiabilities" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NumberOfGrantTypes" xlink:label="NumberOfGrantTypes" xlink:title="NumberOfGrantTypes" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="NumberOfGrantTypes" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to NumberOfGrantTypes" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RevenueFromGovernmentGrants" xlink:label="RevenueFromGovernmentGrants" xlink:title="RevenueFromGovernmentGrants" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="RevenueFromGovernmentGrants" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to RevenueFromGovernmentGrants" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:label="OtherNoncurrentFinancialLiabilities" xlink:title="OtherNoncurrentFinancialLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="OtherNoncurrentFinancialLiabilities" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to OtherNoncurrentFinancialLiabilities" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentFinanceLeaseLiabilities" xlink:label="NoncurrentFinanceLeaseLiabilities" xlink:title="NoncurrentFinanceLeaseLiabilities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="NoncurrentFinanceLeaseLiabilities" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to NoncurrentFinanceLeaseLiabilities" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinancialLiabilitiesTable" xlink:label="DisclosureOfFinancialLiabilitiesTable" xlink:title="DisclosureOfFinancialLiabilitiesTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfFinancialLiabilitiesLineItems" xlink:to="DisclosureOfFinancialLiabilitiesTable" xlink:title="definition: DisclosureOfFinancialLiabilitiesLineItems to DisclosureOfFinancialLiabilitiesTable" order="9.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CounterpartiesAxis" xlink:label="CounterpartiesAxis" xlink:title="CounterpartiesAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfFinancialLiabilitiesTable" xlink:to="CounterpartiesAxis" xlink:title="definition: DisclosureOfFinancialLiabilitiesTable to CounterpartiesAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CounterpartiesMember" xlink:label="CounterpartiesMember" xlink:title="CounterpartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="CounterpartiesAxis" xlink:to="CounterpartiesMember" xlink:title="definition: CounterpartiesAxis to CounterpartiesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CounterpartiesMember" xlink:label="CounterpartiesMember_2" xlink:title="CounterpartiesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="CounterpartiesAxis" xlink:to="CounterpartiesMember_2" xlink:title="definition: CounterpartiesAxis to CounterpartiesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_UnitedStatesDepartmentOfTheTreasuryMember" xlink:label="UnitedStatesDepartmentOfTheTreasuryMember" xlink:title="UnitedStatesDepartmentOfTheTreasuryMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CounterpartiesMember" xlink:to="UnitedStatesDepartmentOfTheTreasuryMember" xlink:title="definition: CounterpartiesMember to UnitedStatesDepartmentOfTheTreasuryMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FederalFinancingBankMember" xlink:label="FederalFinancingBankMember" xlink:title="FederalFinancingBankMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CounterpartiesMember" xlink:to="FederalFinancingBankMember" xlink:title="definition: CounterpartiesMember to FederalFinancingBankMember" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LibertyInteractiveCorporationMember" xlink:label="LibertyInteractiveCorporationMember" xlink:title="LibertyInteractiveCorporationMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="CounterpartiesMember" xlink:to="LibertyInteractiveCorporationMember" xlink:title="definition: CounterpartiesMember to LibertyInteractiveCorporationMember" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityAxis" xlink:label="IntangibleAssetsMaterialToEntityAxis" xlink:title="IntangibleAssetsMaterialToEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfFinancialLiabilitiesTable" xlink:to="IntangibleAssetsMaterialToEntityAxis" xlink:title="definition: DisclosureOfFinancialLiabilitiesTable to IntangibleAssetsMaterialToEntityAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsMaterialToEntityMember" xlink:label="IntangibleAssetsMaterialToEntityMember_2" xlink:title="IntangibleAssetsMaterialToEntityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="IntangibleAssetsMaterialToEntityAxis" xlink:to="IntangibleAssetsMaterialToEntityMember_2" xlink:title="definition: IntangibleAssetsMaterialToEntityAxis to IntangibleAssetsMaterialToEntityMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SolanaAndMojaveMember" xlink:label="SolanaAndMojaveMember" xlink:title="SolanaAndMojaveMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IntangibleAssetsMaterialToEntityMember" xlink:to="SolanaAndMojaveMember" xlink:title="definition: IntangibleAssetsMaterialToEntityMember to SolanaAndMojaveMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/TradePayablesAndOtherCurrentLiabilitiesDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/IncomeTaxDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/FinancialIncomeAndExpensesDetails">
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:label="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:title="DisclosureOfFinancialIncomeAndExpensesLineItems" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FinancialIncomeAbstract" xlink:label="FinancialIncomeAbstract" xlink:title="FinancialIncomeAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="FinancialIncomeAbstract" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to FinancialIncomeAbstract" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_FinancialExpensesAbstract" xlink:label="FinancialExpensesAbstract" xlink:title="FinancialExpensesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="FinancialExpensesAbstract" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to FinancialExpensesAbstract" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_OtherFinancialIncomeExpensesAbstract" xlink:label="OtherFinancialIncomeExpensesAbstract" xlink:title="OtherFinancialIncomeExpensesAbstract" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="OtherFinancialIncomeExpensesAbstract" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to OtherFinancialIncomeExpensesAbstract" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DividendsRetained" xlink:label="DividendsRetained" xlink:title="DividendsRetained" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="DividendsRetained" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to DividendsRetained" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_LossGainFromDerecognitionOfFairValueAssignedToPreferredEquityInvestmentAndRecognitionOfDebtAndEquityInstruments" xlink:label="LossGainFromDerecognitionOfFairValueAssignedToPreferredEquityInvestmentAndRecognitionOfDebtAndEquityInstruments" xlink:title="LossGainFromDerecognitionOfFairValueAssignedToPreferredEquityInvestmentAndRecognitionOfDebtAndEquityInstruments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="LossGainFromDerecognitionOfFairValueAssignedToPreferredEquityInvestmentAndRecognitionOfDebtAndEquityInstruments" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to LossGainFromDerecognitionOfFairValueAssignedToPreferredEquityInvestmentAndRecognitionOfDebtAndEquityInstruments" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DividendIncomeCompensationPreferredEquityInvestment" xlink:label="DividendIncomeCompensationPreferredEquityInvestment" xlink:title="DividendIncomeCompensationPreferredEquityInvestment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="DividendIncomeCompensationPreferredEquityInvestment" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to DividendIncomeCompensationPreferredEquityInvestment" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherFinanceIncome" xlink:label="OtherFinanceIncome" xlink:title="OtherFinanceIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="OtherFinanceIncome" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to OtherFinanceIncome" order="7.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherGainsLosses" xlink:label="OtherGainsLosses" xlink:title="OtherGainsLosses" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="OtherGainsLosses" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to OtherGainsLosses" order="8.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherFinanceIncomeCost" xlink:label="OtherFinanceIncomeCost" xlink:title="OtherFinanceIncomeCost" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="OtherFinanceIncomeCost" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to OtherFinanceIncomeCost" order="9.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestExpenseOnBorrowings" xlink:label="InterestExpenseOnBorrowings" xlink:title="InterestExpenseOnBorrowings" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="InterestExpenseOnBorrowings" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to InterestExpenseOnBorrowings" order="10.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestExpenseOnDebtInstrumentsIssued" xlink:label="InterestExpenseOnDebtInstrumentsIssued" xlink:title="InterestExpenseOnDebtInstrumentsIssued" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="InterestExpenseOnDebtInstrumentsIssued" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to InterestExpenseOnDebtInstrumentsIssued" order="11.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LossesOnChangeInFairValueOfDerivatives" xlink:label="LossesOnChangeInFairValueOfDerivatives" xlink:title="LossesOnChangeInFairValueOfDerivatives" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="LossesOnChangeInFairValueOfDerivatives" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to LossesOnChangeInFairValueOfDerivatives" order="12.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinanceCosts" xlink:label="FinanceCosts" xlink:title="FinanceCosts" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="FinanceCosts" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to FinanceCosts" order="13.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RevenueFromInterest" xlink:label="RevenueFromInterest" xlink:title="RevenueFromInterest" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="RevenueFromInterest" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to RevenueFromInterest" order="14.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainsOnChangeInFairValueOfDerivatives" xlink:label="GainsOnChangeInFairValueOfDerivatives" xlink:title="GainsOnChangeInFairValueOfDerivatives" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="GainsOnChangeInFairValueOfDerivatives" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to GainsOnChangeInFairValueOfDerivatives" order="15.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinanceIncome" xlink:label="FinanceIncome" xlink:title="FinanceIncome" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="FinanceIncome" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to FinanceIncome" order="16.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DisclosureOfFinancialIncomeAndExpensesTable" xlink:label="DisclosureOfFinancialIncomeAndExpensesTable" xlink:title="DisclosureOfFinancialIncomeAndExpensesTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfFinancialIncomeAndExpensesLineItems" xlink:to="DisclosureOfFinancialIncomeAndExpensesTable" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesLineItems to DisclosureOfFinancialIncomeAndExpensesTable" order="17.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="LegalEntityAxis" xlink:title="LegalEntityAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfFinancialIncomeAndExpensesTable" xlink:to="LegalEntityAxis" xlink:title="definition: DisclosureOfFinancialIncomeAndExpensesTable to LegalEntityAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="LegalEntityAxis" xlink:to="EntityDomain" xlink:title="definition: LegalEntityAxis to EntityDomain" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="EntityDomain_2" xlink:title="EntityDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="LegalEntityAxis" xlink:to="EntityDomain_2" xlink:title="definition: LegalEntityAxis to EntityDomain_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AbengoaSAMember" xlink:label="AbengoaSAMember" xlink:title="AbengoaSAMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="AbengoaSAMember" xlink:title="definition: EntityDomain to AbengoaSAMember" order="1.0" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/OtherOperatingExpensesDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/EarningsPerShareDetails" />
  <link:definitionLink xlink:type="extended" xlink:role="http://atlanticayield.com/role/SubsequentEventsDetails">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:label="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:title="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotionalAmount" xlink:label="NotionalAmount" xlink:title="NotionalAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="NotionalAmount" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems to NotionalAmount" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_AdditionalBorrowingCapacityLineOfCreditFacility" xlink:label="AdditionalBorrowingCapacityLineOfCreditFacility" xlink:title="AdditionalBorrowingCapacityLineOfCreditFacility" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="AdditionalBorrowingCapacityLineOfCreditFacility" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems to AdditionalBorrowingCapacityLineOfCreditFacility" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_MaximumBorrowingCapacityLineOfCreditFacility" xlink:label="MaximumBorrowingCapacityLineOfCreditFacility" xlink:title="MaximumBorrowingCapacityLineOfCreditFacility" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="MaximumBorrowingCapacityLineOfCreditFacility" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems to MaximumBorrowingCapacityLineOfCreditFacility" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsMaturity" xlink:label="BorrowingsMaturity" xlink:title="BorrowingsMaturity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="BorrowingsMaturity" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems to BorrowingsMaturity" order="4.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare" xlink:label="DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare" xlink:title="DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems to DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare" order="5.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_DividendPayableDateToBePaidDayMonthAndYear1" xlink:label="DividendPayableDateToBePaidDayMonthAndYear1" xlink:title="DividendPayableDateToBePaidDayMonthAndYear1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="DividendPayableDateToBePaidDayMonthAndYear1" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems to DividendPayableDateToBePaidDayMonthAndYear1" order="6.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:label="DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:title="DisclosureOfNonadjustingEventsAfterReportingPeriodTable" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems" xlink:to="DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems to DisclosureOfNonadjustingEventsAfterReportingPeriodTable" order="7.0" t1:closed="true" t1:contextElement="segment" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis" xlink:label="NonadjustingEventsAfterReportingPeriodAxis" xlink:title="NonadjustingEventsAfterReportingPeriodAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:to="NonadjustingEventsAfterReportingPeriodAxis" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodTable to NonadjustingEventsAfterReportingPeriodAxis" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NonadjustingEventsMember" xlink:label="NonadjustingEventsMember" xlink:title="NonadjustingEventsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="NonadjustingEventsAfterReportingPeriodAxis" xlink:to="NonadjustingEventsMember" xlink:title="definition: NonadjustingEventsAfterReportingPeriodAxis to NonadjustingEventsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NonadjustingEventsMember" xlink:label="NonadjustingEventsMember_2" xlink:title="NonadjustingEventsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="NonadjustingEventsAfterReportingPeriodAxis" xlink:to="NonadjustingEventsMember_2" xlink:title="definition: NonadjustingEventsAfterReportingPeriodAxis to NonadjustingEventsMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_SubsequentEventsMember" xlink:label="SubsequentEventsMember" xlink:title="SubsequentEventsMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="NonadjustingEventsMember" xlink:to="SubsequentEventsMember" xlink:title="definition: NonadjustingEventsMember to SubsequentEventsMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="BorrowingsByNameAxis" xlink:title="BorrowingsByNameAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:to="BorrowingsByNameAxis" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodTable to BorrowingsByNameAxis" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="BorrowingsByNameMember_2" xlink:title="BorrowingsByNameMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="BorrowingsByNameAxis" xlink:to="BorrowingsByNameMember_2" xlink:title="definition: BorrowingsByNameAxis to BorrowingsByNameMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="aby-20180331.xsd#aby_NewRevolvingCreditFacilityMember" xlink:label="NewRevolvingCreditFacilityMember" xlink:title="NewRevolvingCreditFacilityMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BorrowingsByNameMember" xlink:to="NewRevolvingCreditFacilityMember" xlink:title="definition: BorrowingsByNameMember to NewRevolvingCreditFacilityMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="RangeAxis" xlink:title="RangeAxis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="DisclosureOfNonadjustingEventsAfterReportingPeriodTable" xlink:to="RangeAxis" xlink:title="definition: DisclosureOfNonadjustingEventsAfterReportingPeriodTable to RangeAxis" order="3.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="RangesMember" xlink:title="RangesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="RangeAxis" xlink:to="RangesMember" xlink:title="definition: RangeAxis to RangesMember" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="RangesMember_2" xlink:title="RangesMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="RangeAxis" xlink:to="RangesMember_2" xlink:title="definition: RangeAxis to RangesMember_2" order="2.0" />
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="TopOfRangeMember" xlink:title="TopOfRangeMember" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RangesMember" xlink:to="TopOfRangeMember" xlink:title="definition: RangesMember to TopOfRangeMember" order="1.0" />
  </link:definitionLink>
</link:linkbase>
</XBRL>
