<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase 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:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivities" xlink:href="nrg-20180630.xsd#AccountingForDerivativeInstrumentsAndHedgingActivities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesEffectOfAsc815OnAccumulatedOciBalanceAttributableToHedgeDerivativesNetDetails" xlink:href="nrg-20180630.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesEffectOfAsc815OnAccumulatedOciBalanceAttributableToHedgeDerivativesNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesFairValueWithinDerivativeInstrumentValuationDetails" xlink:href="nrg-20180630.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesFairValueWithinDerivativeInstrumentValuationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesNetNotionalVolumeBuySellOfOpenDerivativeTransactionsDetails" xlink:href="nrg-20180630.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesNetNotionalVolumeBuySellOfOpenDerivativeTransactionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesOffsettingOfDerivativesByCounterpartyMasterAgreementLevelAndCollateralReceivedDetails" xlink:href="nrg-20180630.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesOffsettingOfDerivativesByCounterpartyMasterAgreementLevelAndCollateralReceivedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesPreTaxEffectsOfEconomicHedgesNotDesignatedCashFlowHedgesDetails" xlink:href="nrg-20180630.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesPreTaxEffectsOfEconomicHedgesNotDesignatedCashFlowHedgesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesTables" xlink:href="nrg-20180630.xsd#AccountingForDerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositions" xlink:href="nrg-20180630.xsd#AcquisitionsDiscontinuedOperationsAndDispositions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsAcquisitionsDetails" xlink:href="nrg-20180630.xsd#AcquisitionsDiscontinuedOperationsAndDispositionsAcquisitionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsDispositionsDetails" xlink:href="nrg-20180630.xsd#AcquisitionsDiscontinuedOperationsAndDispositionsDispositionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsNarrativeDetails" xlink:href="nrg-20180630.xsd#AcquisitionsDiscontinuedOperationsAndDispositionsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsSummaryOfResultsDetails" xlink:href="nrg-20180630.xsd#AcquisitionsDiscontinuedOperationsAndDispositionsSummaryOfResultsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsTables" xlink:href="nrg-20180630.xsd#AcquisitionsDiscontinuedOperationsAndDispositionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsTransfersOfAssetsUnderCommonControlDetails" xlink:href="nrg-20180630.xsd#AcquisitionsDiscontinuedOperationsAndDispositionsTransfersOfAssetsUnderCommonControlDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/BasisOfPresentation" xlink:href="nrg-20180630.xsd#BasisOfPresentation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/BasisOfPresentationBasisOfPresentationDetails" xlink:href="nrg-20180630.xsd#BasisOfPresentationBasisOfPresentationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructure" xlink:href="nrg-20180630.xsd#ChangesInCapitalStructure" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructureChangesInNrgsCommonSharesOutstandingAndIssuedDetails" xlink:href="nrg-20180630.xsd#ChangesInCapitalStructureChangesInNrgsCommonSharesOutstandingAndIssuedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructureNarrativeDetails" xlink:href="nrg-20180630.xsd#ChangesInCapitalStructureNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructureScheduleOfDividendsPaidDetails" xlink:href="nrg-20180630.xsd#ChangesInCapitalStructureScheduleOfDividendsPaidDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/ChangesInCapitalStructureTables" xlink:href="nrg-20180630.xsd#ChangesInCapitalStructureTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CommitmentsAndContingencies" xlink:href="nrg-20180630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CommitmentsAndContingenciesDetails" xlink:href="nrg-20180630.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheets" xlink:href="nrg-20180630.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="nrg-20180630.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="nrg-20180630.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:href="nrg-20180630.xsd#CondensedConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeLossParenthetical" xlink:href="nrg-20180630.xsd#CondensedConsolidatedStatementsOfComprehensiveIncomeLossParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfOperations" xlink:href="nrg-20180630.xsd#CondensedConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfOperationsCalc2" xlink:href="nrg-20180630.xsd#CondensedConsolidatedStatementsOfOperationsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformation" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationBalanceSheetsDetails" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformationBalanceSheetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationCashFlowsDetails" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformationCashFlowsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationCashFlowsDetailsCalc2" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformationCashFlowsDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationComprehensiveIncomeLossDetails" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformationComprehensiveIncomeLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationNarrativeDetails" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationStatementsOfOperationsDetails" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformationStatementsOfOperationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationTables" xlink:href="nrg-20180630.xsd#CondensedConsolidatingFinancialInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeases" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeasesConvertibleSeniorNotesDetails" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeasesConvertibleSeniorNotesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeasesEnergyCenterMinneapolisSeriesNotesDetails" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeasesEnergyCenterMinneapolisSeriesNotesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeasesNarrativeDetails" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeasesScheduleOfLongTermDebtAndCapitalLeasesDetails" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeasesScheduleOfLongTermDebtAndCapitalLeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeasesScheduleOfLongTermDebtAndCapitalLeasesDetailsCalc2" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeasesScheduleOfLongTermDebtAndCapitalLeasesDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeasesSeniorNotesRepurchasedDetails" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeasesSeniorNotesRepurchasedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DebtAndCapitalLeasesTables" xlink:href="nrg-20180630.xsd#DebtAndCapitalLeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/DocumentAndEntityInformation" xlink:href="nrg-20180630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/EarningsLossPerShare" xlink:href="nrg-20180630.xsd#EarningsLossPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/EarningsLossPerShareAntiDilutiveSecuritiesDetails" xlink:href="nrg-20180630.xsd#EarningsLossPerShareAntiDilutiveSecuritiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/EarningsLossPerShareReconciliationOfBasicAndDilutedEpsDetails" xlink:href="nrg-20180630.xsd#EarningsLossPerShareReconciliationOfBasicAndDilutedEpsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/EarningsLossPerShareTables" xlink:href="nrg-20180630.xsd#EarningsLossPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/EnvironmentalMatters" xlink:href="nrg-20180630.xsd#EnvironmentalMatters" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstruments" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetails" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsCounterpartyCreditRiskDetails" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstrumentsCounterpartyCreditRiskDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsDerivativeFairValueMeasurementsDetails" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstrumentsDerivativeFairValueMeasurementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsDerivativeFairValueMeasurementsNarrativeDetails" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstrumentsDerivativeFairValueMeasurementsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsEstimatedCarryingAmountsAndFairValueOfFinancialInstrumentsNotCarriedAtFairValueDetails" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstrumentsEstimatedCarryingAmountsAndFairValueOfFinancialInstrumentsNotCarriedAtFairValueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsReconciliationOfLevel3FinancialInstrumentsDetails" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstrumentsReconciliationOfLevel3FinancialInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsTables" xlink:href="nrg-20180630.xsd#FairValueOfFinancialInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/Impairments" xlink:href="nrg-20180630.xsd#Impairments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/ImpairmentsDetails" xlink:href="nrg-20180630.xsd#ImpairmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/IncomeTaxes" xlink:href="nrg-20180630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/IncomeTaxesDetails" xlink:href="nrg-20180630.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/IncomeTaxesTables" xlink:href="nrg-20180630.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFund" xlink:href="nrg-20180630.xsd#NuclearDecommissioningTrustFund" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFundSummaryOfAggregateFairValuesAndRealizedGainsAndLossesDetails" xlink:href="nrg-20180630.xsd#NuclearDecommissioningTrustFundSummaryOfAggregateFairValuesAndRealizedGainsAndLossesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFundSummaryOfProceedsFromSalesOfAvailableForSaleSecuritiesAndRelatedGainsAndLossesDetails" xlink:href="nrg-20180630.xsd#NuclearDecommissioningTrustFundSummaryOfProceedsFromSalesOfAvailableForSaleSecuritiesAndRelatedGainsAndLossesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFundTables" xlink:href="nrg-20180630.xsd#NuclearDecommissioningTrustFundTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/RegulatoryMatters" xlink:href="nrg-20180630.xsd#RegulatoryMatters" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/RegulatoryMattersDetails" xlink:href="nrg-20180630.xsd#RegulatoryMattersDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/RelatedPartyTransactions" xlink:href="nrg-20180630.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/RelatedPartyTransactionsCreditAgreementWithGenonDetails" xlink:href="nrg-20180630.xsd#RelatedPartyTransactionsCreditAgreementWithGenonDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/RelatedPartyTransactionsServiceAgreementAndTransitionServicesAgreementWithGenonDetails" xlink:href="nrg-20180630.xsd#RelatedPartyTransactionsServiceAgreementAndTransitionServicesAgreementWithGenonDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SegmentReporting" xlink:href="nrg-20180630.xsd#SegmentReporting" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SegmentReportingDetails" xlink:href="nrg-20180630.xsd#SegmentReportingDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SegmentReportingTables" xlink:href="nrg-20180630.xsd#SegmentReportingTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesCapacityRevenueDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesCapacityRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesContractAssetsAndLiabilitiesDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesContractAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesDisaggregationOfRevenueDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesDisaggregationOfRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesNoncontrollingInterestDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesNoncontrollingInterestDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesOtherBalanceSheetInformationDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesOtherBalanceSheetInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRecentAccountingDevelopmentsDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesRecentAccountingDevelopmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRedeemableNoncontrollingInterestDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesRedeemableNoncontrollingInterestDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesRestrictedCashDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="nrg-20180630.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesOrVies" xlink:href="nrg-20180630.xsd#VariableInterestEntitiesOrVies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesOrViesDetails" xlink:href="nrg-20180630.xsd#VariableInterestEntitiesOrViesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.nrgenergy.com/role/VariableInterestEntitiesOrViesTables" xlink:href="nrg-20180630.xsd#VariableInterestEntitiesOrViesTables" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivities" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesEffectOfAsc815OnAccumulatedOciBalanceAttributableToHedgeDerivativesNetDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesFairValueWithinDerivativeInstrumentValuationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesNetNotionalVolumeBuySellOfOpenDerivativeTransactionsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesOffsettingOfDerivativesByCounterpartyMasterAgreementLevelAndCollateralReceivedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_E04CBB790A3A5697836B674907CBC3AC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_235BE4363279530F976D58AB0B84502C" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_E04CBB790A3A5697836B674907CBC3AC" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_235BE4363279530F976D58AB0B84502C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_472FB40C250E59AAAF5957B5A61E35B4" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_E04CBB790A3A5697836B674907CBC3AC" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_472FB40C250E59AAAF5957B5A61E35B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimCash" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_2C0D1E9A11E55068BF5425D26321159C" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_E04CBB790A3A5697836B674907CBC3AC" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_2C0D1E9A11E55068BF5425D26321159C" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral" xlink:label="loc_nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral_FFCFE18DCD375159AA79DFC753AD13E7" xlink:type="locator" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet" xlink:label="loc_nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet_D4ED8CB56B0953B48363F4993DA8D3EF" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral_FFCFE18DCD375159AA79DFC753AD13E7" xlink:to="loc_nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet_D4ED8CB56B0953B48363F4993DA8D3EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_03AA45668317518A9800F8001744D4CE" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet_D4ED8CB56B0953B48363F4993DA8D3EF" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_03AA45668317518A9800F8001744D4CE" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_FairValueofGrossDerivativeAssetsLiabilitiesNet_D4ED8CB56B0953B48363F4993DA8D3EF" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_235BE4363279530F976D58AB0B84502C" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset" xlink:label="loc_nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset_CB0A3080CE41540686EE7BCA2A89BEBC" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral_FFCFE18DCD375159AA79DFC753AD13E7" xlink:to="loc_nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset_CB0A3080CE41540686EE7BCA2A89BEBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossLiability" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_EA4CB903A20B5B6393B3C51C78CA684A" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset_CB0A3080CE41540686EE7BCA2A89BEBC" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_EA4CB903A20B5B6393B3C51C78CA684A" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_DerivativeAssetFairValueGrossLiabilityNetOfDerivativeLiabilityFairValueGrossAsset_CB0A3080CE41540686EE7BCA2A89BEBC" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_472FB40C250E59AAAF5957B5A61E35B4" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash" xlink:label="loc_nrg_DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash_2531BAA5CC925330ADC6DDEA20A0095D" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_DerivativeAssetFairValueAmountOffsetAgainstCollateralNetOfDerivativeLiabilityFairValueAmountOffsetAgainstCollateral_FFCFE18DCD375159AA79DFC753AD13E7" xlink:to="loc_nrg_DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash_2531BAA5CC925330ADC6DDEA20A0095D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_DCF87D7C6CD4556698F4C94E6A1BA9D0" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash_2531BAA5CC925330ADC6DDEA20A0095D" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_DCF87D7C6CD4556698F4C94E6A1BA9D0" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_DerivativeCollateralObligationToReturnCashNetOfDerivativeCollateralRightToReclaimCash_2531BAA5CC925330ADC6DDEA20A0095D" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_2C0D1E9A11E55068BF5425D26321159C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_8440EF15091253F89B66FE5758C36184" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_8440EF15091253F89B66FE5758C36184" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_03AA45668317518A9800F8001744D4CE" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_8440EF15091253F89B66FE5758C36184" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_EA4CB903A20B5B6393B3C51C78CA684A" xlink:type="arc" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_8440EF15091253F89B66FE5758C36184" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_DCF87D7C6CD4556698F4C94E6A1BA9D0" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesPreTaxEffectsOfEconomicHedgesNotDesignatedCashFlowHedgesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivatives" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_dde99a81-dd7e-8567-385b-abc551560117" xlink:type="locator" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities" xlink:label="loc_nrg_UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities_44e57438-9da4-aa7b-1f7d-16a04a82153f" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_UnrealizedGainLossOnDerivatives_dde99a81-dd7e-8567-385b-abc551560117" xlink:to="loc_nrg_UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities_44e57438-9da4-aa7b-1f7d-16a04a82153f" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ReversalPreviouslyRecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges" xlink:label="loc_nrg_ReversalPreviouslyRecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges_d96a926f-73e6-d988-86a2-16a0499eb401" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities_44e57438-9da4-aa7b-1f7d-16a04a82153f" xlink:to="loc_nrg_ReversalPreviouslyRecognizedUnrealizedGainsLossesSettledPositionsEconomicHedges_d96a926f-73e6-d988-86a2-16a0499eb401" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_078ed4dc-d810-ff19-8356-9832cd920e69" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities_44e57438-9da4-aa7b-1f7d-16a04a82153f" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_078ed4dc-d810-ff19-8356-9832cd920e69" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ReversalPreviouslyRecognizedUnrealizedGainsLossesAcquiredasPartofAcquisitionEconomicHedges" xlink:label="loc_nrg_ReversalPreviouslyRecognizedUnrealizedGainsLossesAcquiredasPartofAcquisitionEconomicHedges_f2528e05-af8e-d345-5b1d-16b68b4cdd3f" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_UnrealizedGainLossOnDerivativesMarkToMarketEconomicHedgingActivities_44e57438-9da4-aa7b-1f7d-16a04a82153f" xlink:to="loc_nrg_ReversalPreviouslyRecognizedUnrealizedGainsLossesAcquiredasPartofAcquisitionEconomicHedges_f2528e05-af8e-d345-5b1d-16b68b4cdd3f" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_UnrealizedGainLossonDerivativesMarkToMarketTradingActivities" xlink:label="loc_nrg_UnrealizedGainLossonDerivativesMarkToMarketTradingActivities_393f8c74-525f-59e7-faef-16a04a9ab17b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_UnrealizedGainLossOnDerivatives_dde99a81-dd7e-8567-385b-abc551560117" xlink:to="loc_nrg_UnrealizedGainLossonDerivativesMarkToMarketTradingActivities_393f8c74-525f-59e7-faef-16a04a9ab17b" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity" xlink:label="loc_nrg_ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity_b5d44fd2-0975-85a9-a35e-16a04a76ef95" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_UnrealizedGainLossonDerivativesMarkToMarketTradingActivities_393f8c74-525f-59e7-faef-16a04a9ab17b" xlink:to="loc_nrg_ReversalPreviouslyUnrecognizedUnrealizedGainsLossesSettledPositionsTradingActivity_b5d44fd2-0975-85a9-a35e-16a04a76ef95" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet" xlink:label="loc_nrg_DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet_c95c0017-6de4-aa9a-6970-16a04b13fd4e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_UnrealizedGainLossonDerivativesMarkToMarketTradingActivities_393f8c74-525f-59e7-faef-16a04a9ab17b" xlink:to="loc_nrg_DerivativeUnrealizedGainsOnOpenPositionsRelatedToTradingActivityNet_c95c0017-6de4-aa9a-6970-16a04b13fd4e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AccountingForDerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositions" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsAcquisitionsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsDispositionsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsSummaryOfResultsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_3499d6fa-02b9-de09-04ba-5055e28f27a0" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_3499d6fa-02b9-de09-04ba-5055e28f27a0" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_IncomeLossfromDiscontinuedOperationsNetofTaxBeforeInterestIncomeIncludingPortionAttributabletoNoncontrollingInterest" xlink:label="loc_nrg_IncomeLossfromDiscontinuedOperationsNetofTaxBeforeInterestIncomeIncludingPortionAttributabletoNoncontrollingInterest_77C0C55277E725BD3FBA84ECE687F3B9" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_3499d6fa-02b9-de09-04ba-5055e28f27a0" xlink:to="loc_nrg_IncomeLossfromDiscontinuedOperationsNetofTaxBeforeInterestIncomeIncludingPortionAttributabletoNoncontrollingInterest_77C0C55277E725BD3FBA84ECE687F3B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_c095036e-19fc-eccd-4b1f-e7ecaae34dfa" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_IncomeLossfromDiscontinuedOperationsNetofTaxBeforeInterestIncomeIncludingPortionAttributabletoNoncontrollingInterest_77C0C55277E725BD3FBA84ECE687F3B9" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_c095036e-19fc-eccd-4b1f-e7ecaae34dfa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_baf1e750-e749-4289-93f6-efc39cd01e57" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_c095036e-19fc-eccd-4b1f-e7ecaae34dfa" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_baf1e750-e749-4289-93f6-efc39cd01e57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_1fb7f781-585c-8941-0d30-a55046e8b7fe" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_c095036e-19fc-eccd-4b1f-e7ecaae34dfa" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_1fb7f781-585c-8941-0d30-a55046e8b7fe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense_7bc4989d-8abf-e2b0-c069-98389c16054b" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_c095036e-19fc-eccd-4b1f-e7ecaae34dfa" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense_7bc4989d-8abf-e2b0-c069-98389c16054b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_64dfb8a3-e793-00fc-3cb3-ad8751b1d684" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_IncomeLossfromDiscontinuedOperationsNetofTaxBeforeInterestIncomeIncludingPortionAttributabletoNoncontrollingInterest_77C0C55277E725BD3FBA84ECE687F3B9" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_64dfb8a3-e793-00fc-3cb3-ad8751b1d684" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome_ab2320c8-a8b7-92ea-e650-fae01dd64230" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_3499d6fa-02b9-de09-04ba-5055e28f27a0" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestIncome_ab2320c8-a8b7-92ea-e650-fae01dd64230" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ed6d6007-850c-eb63-dcdf-32fc8e15100b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ed6d6007-850c-eb63-dcdf-32fc8e15100b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_75fb9940-bd63-976c-4153-3fd85df1949d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ed6d6007-850c-eb63-dcdf-32fc8e15100b" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_75fb9940-bd63-976c-4153-3fd85df1949d" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DiscontinuedOperationSettlementConsiderationAndPriorServiceCostCredit" xlink:label="loc_nrg_DiscontinuedOperationSettlementConsiderationAndPriorServiceCostCredit_A6A53AAD8191B1FA2B3984F279313B78" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ed6d6007-850c-eb63-dcdf-32fc8e15100b" xlink:to="loc_nrg_DiscontinuedOperationSettlementConsiderationAndPriorServiceCostCredit_A6A53AAD8191B1FA2B3984F279313B78" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DiscontinuedOperationPensionLiabilityAssumption" xlink:label="loc_nrg_DiscontinuedOperationPensionLiabilityAssumption_1CD19B84BF597777607184F3FF846F7A" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ed6d6007-850c-eb63-dcdf-32fc8e15100b" xlink:to="loc_nrg_DiscontinuedOperationPensionLiabilityAssumption_1CD19B84BF597777607184F3FF846F7A" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DisposalGroupIncludingDiscontinuedOperationAdvisoryAndConsultingFees" xlink:label="loc_nrg_DisposalGroupIncludingDiscontinuedOperationAdvisoryAndConsultingFees_AFD921A45F27588C4DB384F538EF02E4" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ed6d6007-850c-eb63-dcdf-32fc8e15100b" xlink:to="loc_nrg_DisposalGroupIncludingDiscontinuedOperationAdvisoryAndConsultingFees_AFD921A45F27588C4DB384F538EF02E4" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense" xlink:label="loc_nrg_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_684F01EBBD96DE21B2DB7A32FC09F0D8" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ed6d6007-850c-eb63-dcdf-32fc8e15100b" xlink:to="loc_nrg_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_684F01EBBD96DE21B2DB7A32FC09F0D8" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/AcquisitionsDiscontinuedOperationsAndDispositionsTransfersOfAssetsUnderCommonControlDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/BasisOfPresentation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/BasisOfPresentationBasisOfPresentationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructure" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructureChangesInNrgsCommonSharesOutstandingAndIssuedDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructureNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructureScheduleOfDividendsPaidDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/ChangesInCapitalStructureTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CommitmentsAndContingenciesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_1944a381-5c4e-ce3c-9111-13ccd1c639db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c6057b1d-6685-8249-2051-6c57f3a16a9e" xlink:to="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_13aaa34e-8d7d-009a-bd8a-20360af7ca09" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_13aaa34e-8d7d-009a-bd8a-20360af7ca09" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_7a72b51a-735c-1ad4-bd3f-d9bcf2d6a26d" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_AccountsPayableCurrent_7a72b51a-735c-1ad4-bd3f-d9bcf2d6a26d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_8146ce3b-5219-e322-03f4-6640ac9d1ea8" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_8146ce3b-5219-e322-03f4-6640ac9d1ea8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitiesCurrent" xlink:label="loc_us-gaap_DerivativeLiabilitiesCurrent_02b1756e-a27a-df0b-cb87-4e42d7ab59c6" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_DerivativeLiabilitiesCurrent_02b1756e-a27a-df0b-cb87-4e42d7ab59c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_8060d50a-80f9-7a72-a6c9-845ee11dfd93" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_8060d50a-80f9-7a72-a6c9-845ee11dfd93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_00b000cf-7f1d-4891-7244-daf9f6335db0" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_00b000cf-7f1d-4891-7244-daf9f6335db0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DueToAffiliateCurrent" xlink:label="loc_us-gaap_DueToAffiliateCurrent_fa002a1d-3cca-a0c9-a6b1-e0373c153068" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_DueToAffiliateCurrent_fa002a1d-3cca-a0c9-a6b1-e0373c153068" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent_9362d817-7b56-6620-0458-f6f7ee09c599" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_f5e246cf-e80f-d00b-c8ed-4796aa2df4b4" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent_9362d817-7b56-6620-0458-f6f7ee09c599" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_d8bb821f-d155-9d4e-1738-736b4bf4cb19" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_f68a050d-d5b6-1395-99ff-ed06c9a31fb4" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_f68a050d-d5b6-1395-99ff-ed06c9a31fb4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DecommissioningLiabilityNoncurrent" xlink:label="loc_us-gaap_DecommissioningLiabilityNoncurrent_76e47d8d-a694-50ce-b324-18072f7270aa" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_us-gaap_DecommissioningLiabilityNoncurrent_76e47d8d-a694-50ce-b324-18072f7270aa" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_NuclearDecommissioningTrustFundLiabilityNoncurrent" xlink:label="loc_nrg_NuclearDecommissioningTrustFundLiabilityNoncurrent_46481d88-8be0-17c4-d0aa-16b68ba708b8" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_nrg_NuclearDecommissioningTrustFundLiabilityNoncurrent_46481d88-8be0-17c4-d0aa-16b68ba708b8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_314eb579-3ee1-408c-39f2-e62f2f37befc" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_314eb579-3ee1-408c-39f2-e62f2f37befc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_3ffd0622-1cf7-dfe7-dae7-2020e36f2f4a" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_3ffd0622-1cf7-dfe7-dae7-2020e36f2f4a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OffMarketLeaseUnfavorable" xlink:label="loc_us-gaap_OffMarketLeaseUnfavorable_2a0c13f1-4510-4d92-7a14-7772ac0df942" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_us-gaap_OffMarketLeaseUnfavorable_2a0c13f1-4510-4d92-7a14-7772ac0df942" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_a4dfe063-f815-c20a-13ad-828f72cb97e5" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_a4dfe063-f815-c20a-13ad-828f72cb97e5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_ce6ab6ce-f8d5-dad6-a84c-2c96c7d59f75" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_f234998c-5e05-09d0-d53e-5c44423c97c0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:to="loc_us-gaap_CommonStockValue_c3f7606a-e7e9-61d5-b60b-b4b059f68b26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_41895068-9590-2880-73df-521995865843" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_41895068-9590-2880-73df-521995865843" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_065cb284-7fca-cc9b-5752-2feaf74d0011" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_40678492-c421-af67-b276-f663f9ff2f98" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:to="loc_us-gaap_TreasuryStockValue_40678492-c421-af67-b276-f663f9ff2f98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_04f0961a-a0bc-88cf-6658-3f950da4a458" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_cb565c4d-35c2-d825-4672-f1619e51c133" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_00443492-92dd-7fc1-13b6-792f3e163e73" xlink:to="loc_us-gaap_MinorityInterest_cb565c4d-35c2-d825-4672-f1619e51c133" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityOtherCarryingAmount" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityOtherCarryingAmount_ccbab92b-b2c3-85be-8295-6769dceee439" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityOtherCarryingAmount_ccbab92b-b2c3-85be-8295-6769dceee439" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_058e01e4-b9a1-623e-29f5-1b5c79bf095a" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_159dcb00-b17e-17db-7098-be4159799459" xlink:to="loc_us-gaap_CommitmentsAndContingencies_058e01e4-b9a1-623e-29f5-1b5c79bf095a" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_c2c196d6-13d0-2f1a-74ee-f582ca75b52c" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_70319186-e7bd-7189-88d2-eba26fb93350" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_c2c196d6-13d0-2f1a-74ee-f582ca75b52c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInDiscontinuedOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_929f4456-a56e-9b42-7f02-a9e68ad1a7fb" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_1250a129-7059-13df-3c61-0ce58f6c0edb" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_929f4456-a56e-9b42-7f02-a9e68ad1a7fb" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_1250a129-7059-13df-3c61-0ce58f6c0edb" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_929f4456-a56e-9b42-7f02-a9e68ad1a7fb" xlink:to="loc_us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations_c2c196d6-13d0-2f1a-74ee-f582ca75b52c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_41d34a64-5135-57ad-661a-9f86a4fee4f7" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_929f4456-a56e-9b42-7f02-a9e68ad1a7fb" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_41d34a64-5135-57ad-661a-9f86a4fee4f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_9b8323ad-1658-fe33-490d-bb35957a8b02" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_9b8323ad-1658-fe33-490d-bb35957a8b02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_3bb02469-191c-4baa-c8ee-e08be21b11bb" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_3bb02469-191c-4baa-c8ee-e08be21b11bb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfPowerContractsEmissionCredits" xlink:label="loc_us-gaap_AmortizationOfPowerContractsEmissionCredits_e3f0f46e-b4cc-0349-9a84-aead4260a083" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_AmortizationOfPowerContractsEmissionCredits_e3f0f46e-b4cc-0349-9a84-aead4260a083" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_e9a2cdf1-6f49-806b-7b55-b9320bcfa87f" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_e9a2cdf1-6f49-806b-7b55-b9320bcfa87f" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_GainsLossesOnExtinguishmentOfDebtNonCashPortion" xlink:label="loc_nrg_GainsLossesOnExtinguishmentOfDebtNonCashPortion_16a907b4-aae4-d4bb-66fa-16b68ac90ecd" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_nrg_GainsLossesOnExtinguishmentOfDebtNonCashPortion_16a907b4-aae4-d4bb-66fa-16b68ac90ecd" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_AmortizationOfIntangiblesAndOutOfMarketContracts" xlink:label="loc_nrg_AmortizationOfIntangiblesAndOutOfMarketContracts_0af72d34-8063-196b-19f5-16a04ad6c1a1" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_nrg_AmortizationOfIntangiblesAndOutOfMarketContracts_0af72d34-8063-196b-19f5-16a04ad6c1a1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_32a1f577-1984-0dba-8328-1c5c7b04d5c1" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_32a1f577-1984-0dba-8328-1c5c7b04d5c1" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ChangesInNuclearDecommissioningTrustLiability" xlink:label="loc_nrg_ChangesInNuclearDecommissioningTrustLiability_385419d1-9f29-43b3-648f-16b68ae7b588" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_nrg_ChangesInNuclearDecommissioningTrustLiability_385419d1-9f29-43b3-648f-16b68ae7b588" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities_fd1e7593-ca9f-7490-e93f-03cded79a8ad" xlink:type="locator" />
    <link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities_fd1e7593-ca9f-7490-e93f-03cded79a8ad" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities" xlink:label="loc_nrg_ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities_bcaa31d9-7022-9b75-6255-16a04a6bca0d" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_nrg_ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities_bcaa31d9-7022-9b75-6255-16a04a6bca0d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnDispositionOfIntangibleAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfIntangibleAssets_a1de4b98-8e53-a8ff-9c23-9f152320731c" xlink:type="locator" />
    <link:calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_GainLossOnDispositionOfIntangibleAssets_a1de4b98-8e53-a8ff-9c23-9f152320731c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets1" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_d5dace7e-16a2-02a1-4993-85329c91fc1e" xlink:type="locator" />
    <link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_d5dace7e-16a2-02a1-4993-85329c91fc1e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_962cfc51-230d-a221-126b-1d12af7a5921" xlink:type="locator" />
    <link:calculationArc order="15" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_962cfc51-230d-a221-126b-1d12af7a5921" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ImpairmentLosses" xlink:label="loc_nrg_ImpairmentLosses_c1c07e5a-e9e3-cd1f-0ac4-16b68b06631c" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_nrg_ImpairmentLosses_c1c07e5a-e9e3-cd1f-0ac4-16b68b06631c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeconsolidationGainOrLossAmount" xlink:label="loc_us-gaap_DeconsolidationGainOrLossAmount_b3efd01c-3315-0ac7-d11f-123f3ebb1edb" xlink:type="locator" />
    <link:calculationArc order="17" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_DeconsolidationGainOrLossAmount_b3efd01c-3315-0ac7-d11f-123f3ebb1edb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_9b039144-dc24-2381-1de5-20fa04e9b091" xlink:type="locator" />
    <link:calculationArc order="18" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_9b039144-dc24-2381-1de5-20fa04e9b091" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_41d34a64-5135-57ad-661a-9f86a4fee4f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_9ead1b94-5c78-ce9f-379f-74649d16d2bc" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_8629a772-7004-5d77-9980-0f501e29c5c8" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_84cc24ed-d44c-2db0-9066-6b54091db5c7" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_8629a772-7004-5d77-9980-0f501e29c5c8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_1250a129-7059-13df-3c61-0ce58f6c0edb" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="extended">
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders" xlink:label="loc_nrg_ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders_b462346e-87fd-a8b6-b82e-16b68a45e35f" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_nrg_ComprehensiveIncomeLossNetOfTaxAvailableForCommonStockholders_b462346e-87fd-a8b6-b82e-16b68a45e35f" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_dd69e307-3cf6-284a-5315-8fa7ac464283" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_dd69e307-3cf6-284a-5315-8fa7ac464283" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_dd69e307-3cf6-284a-5315-8fa7ac464283" xlink:to="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_dd69e307-3cf6-284a-5315-8fa7ac464283" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_cc7c59d2-21ac-163e-0898-1c1f212ef02b" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_cc7c59d2-21ac-163e-0898-1c1f212ef02b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_351eeed0-a987-88e4-c007-095f3644ffff" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_351eeed0-a987-88e4-c007-095f3644ffff" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_2652b636-1a3b-e639-2800-d9ed5b9b4fc0" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_2652b636-1a3b-e639-2800-d9ed5b9b4fc0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_548688b8-2d34-462c-5a92-aa79f1c44c1a" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2a6e77d2-a694-61f8-1c68-085fd849c780" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_548688b8-2d34-462c-5a92-aa79f1c44c1a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_7908f590-67cb-1122-d422-880e24cad7ce" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_499015ce-2160-aed2-85a3-080e8c4c6cdf" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_7908f590-67cb-1122-d422-880e24cad7ce" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeLossParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:to="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a53f52a4-7a54-3283-f734-95683c76ebff" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a53f52a4-7a54-3283-f734-95683c76ebff" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a53f52a4-7a54-3283-f734-95683c76ebff" xlink:to="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_33f76b65-31cf-be04-0849-25af345446d5" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_Revenues_33f76b65-31cf-be04-0849-25af345446d5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_a2b142e3-b3f3-b7b6-6428-5812971ab980" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_CostOfRevenue_a2b142e3-b3f3-b7b6-6428-5812971ab980" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_37b0c31d-5d8b-0577-dfd9-aa56a79334e3" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_37b0c31d-5d8b-0577-dfd9-aa56a79334e3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_29ad42f4-24c5-90ea-4492-fdb757d66249" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_29ad42f4-24c5-90ea-4492-fdb757d66249" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_25ae5ce2-b413-b975-9a84-c7503d2496cf" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_25ae5ce2-b413-b975-9a84-c7503d2496cf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringCosts" xlink:label="loc_us-gaap_RestructuringCosts_050f971e-149c-ce5d-2cf1-fbbf58be6616" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_RestructuringCosts_050f971e-149c-ce5d-2cf1-fbbf58be6616" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_922befcd-b5b1-7112-2dca-80fbde69a2fe" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_0d9ff7d0-e871-5bdf-adbd-21d7dbf57556" xlink:to="loc_us-gaap_AssetImpairmentCharges_922befcd-b5b1-7112-2dca-80fbde69a2fe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnSaleOfOtherAssets" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherAssets_e16f40d7-1761-d7ac-02fc-51ccf66c153c" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherAssets_e16f40d7-1761-d7ac-02fc-51ccf66c153c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty" xlink:label="loc_us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty_d43a24a5-2977-b815-6b5a-861ee8434d0c" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_9894e895-7695-402a-9f03-08d60b7373b8" xlink:to="loc_us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty_d43a24a5-2977-b815-6b5a-861ee8434d0c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_a53f52a4-7a54-3283-f734-95683c76ebff" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_1c520208-bae2-1c51-b4b4-935e91f5fece" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_1c520208-bae2-1c51-b4b4-935e91f5fece" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_250c3b2f-7db5-7088-68cc-1dd831a2c2d7" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_250c3b2f-7db5-7088-68cc-1dd831a2c2d7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3db65903-3171-d63c-a688-532ba00b8108" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_3db65903-3171-d63c-a688-532ba00b8108" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_9b894abb-bf85-2810-9d9d-c92a9b0f56f1" xlink:to="loc_us-gaap_InterestExpense_7c9599ab-2a77-022c-c720-63fecff6a62c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_78b7d85e-8366-fe6d-cb1f-faac5a041b79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_baabbf0a-644b-708a-c310-1211f9af2775" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_641b1cab-a2b3-2e0e-8389-1455ff3f8581" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_baabbf0a-644b-708a-c310-1211f9af2775" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_220f7108-2ee6-8535-1bca-b062759c7beb" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_f309c50c-2dc0-f2fb-e4a2-9d61bc04812a" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_220f7108-2ee6-8535-1bca-b062759c7beb" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_f309c50c-2dc0-f2fb-e4a2-9d61bc04812a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare_527f0dda-3cdc-4b82-1058-6027ad25b148" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_220f7108-2ee6-8535-1bca-b062759c7beb" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare_527f0dda-3cdc-4b82-1058-6027ad25b148" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_fe6ff5e7-33ad-d0eb-3545-2854577c8d1d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_e4763c0c-8fb9-af76-cf2b-4d5847742ea9" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasic_fe6ff5e7-33ad-d0eb-3545-2854577c8d1d" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_e4763c0c-8fb9-af76-cf2b-4d5847742ea9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare_240a9501-620c-ed63-04a8-c8905e2cf3d1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasic_fe6ff5e7-33ad-d0eb-3545-2854577c8d1d" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare_240a9501-620c-ed63-04a8-c8905e2cf3d1" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatedStatementsOfOperationsCalc2" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07da1db4-2708-4446-4250-1fdd5956185e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_07da1db4-2708-4446-4250-1fdd5956185e" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_FundsDepositedByCounterparties" xlink:label="loc_nrg_FundsDepositedByCounterparties_ece20cbb-976f-423f-961d-16a0499547bb" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_nrg_FundsDepositedByCounterparties_ece20cbb-976f-423f-961d-16a0499547bb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_d69779e7-80bd-4b93-0bb0-641eb2f586cc" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_d69779e7-80bd-4b93-0bb0-641eb2f586cc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_dd7775cd-f4ab-5607-9b31-1ee98f605818" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_dd7775cd-f4ab-5607-9b31-1ee98f605818" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_InventoryNet_7eab44cf-1ea1-ca2a-420f-21f7b5343fc3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedges" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedges_8a163eee-b097-e193-4d62-279aa00353af" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedges_8a163eee-b097-e193-4d62-279aa00353af" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimCash" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_703addb2-f097-e4df-e5c9-7db1ef6b8ddd" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_703addb2-f097-e4df-e5c9-7db1ef6b8ddd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2294e6a2-7bab-43ed-d02c-bdf73b8fa561" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_7ccd4058-c821-b334-f2ba-45d4b5754cc1" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_7ccd4058-c821-b334-f2ba-45d4b5754cc1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DueFromAffiliateCurrent" xlink:label="loc_us-gaap_DueFromAffiliateCurrent_7d2dbf5b-dfea-98d6-0d65-0487859ba601" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_8a47066b-3628-88d1-49db-ed09aecc7fc7" xlink:to="loc_us-gaap_DueFromAffiliateCurrent_7d2dbf5b-dfea-98d6-0d65-0487859ba601" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:label="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_42d61097-0951-9fd0-ccda-87d8624a6e85" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_42d61097-0951-9fd0-ccda-87d8624a6e85" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_cf3b9d2e-b42f-76bb-8c85-9bcfc4c76505" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_EquityMethodInvestments_cf3b9d2e-b42f-76bb-8c85-9bcfc4c76505" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_93a64cae-271a-5e6b-8c83-5adf9f941142" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_Goodwill_93a64cae-271a-5e6b-8c83-5adf9f941142" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_49187b45-82fd-7060-b114-79ff249a4331" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_49187b45-82fd-7060-b114-79ff249a4331" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DecommissioningTrustAssetsAmount" xlink:label="loc_us-gaap_DecommissioningTrustAssetsAmount_56930ff4-ec99-352f-e46b-e898a4f68484" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_DecommissioningTrustAssetsAmount_56930ff4-ec99-352f-e46b-e898a4f68484" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent_79b86299-04f6-ff11-6b66-c6ef1f697685" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent_79b86299-04f6-ff11-6b66-c6ef1f697685" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgesNoncurrent" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgesNoncurrent_17d5932e-10bb-f23f-9fbe-d44f92a486e6" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgesNoncurrent_17d5932e-10bb-f23f-9fbe-d44f92a486e6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_9b27fab9-d497-627b-4cfb-6b585220b978" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_c4ddb8fa-14d3-bd62-071d-844519013aa9" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets_c4ddb8fa-14d3-bd62-071d-844519013aa9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NotesAndLoansReceivableNetNoncurrent" xlink:label="loc_us-gaap_NotesAndLoansReceivableNetNoncurrent_f82a428b-0d8b-bf2c-7531-3dd90c59a31c" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsNoncurrent_c2a54b62-8f9f-23d7-42a9-40a903409813" xlink:to="loc_us-gaap_NotesAndLoansReceivableNetNoncurrent_f82a428b-0d8b-bf2c-7531-3dd90c59a31c" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationCashFlowsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_IntercompanyDividendFromParentFinancingActivities" xlink:label="loc_nrg_IntercompanyDividendFromParentFinancingActivities_4AE0A36ED1F42008069C9089F23AE753" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_nrg_IntercompanyDividendFromParentFinancingActivities_4AE0A36ED1F42008069C9089F23AE753" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ProceedsFromPaymentsToIntercompanyLoans" xlink:label="loc_nrg_ProceedsFromPaymentsToIntercompanyLoans_a4f20fca-98e1-494e-b6d8-16b68ae80a37" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_nrg_ProceedsFromPaymentsToIntercompanyLoans_a4f20fca-98e1-494e-b6d8-16b68ae80a37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessThreeNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessThreeNetOfCashAcquired_b2e16ea9-f380-0586-8e27-40fe26ea93e7" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessThreeNetOfCashAcquired_b2e16ea9-f380-0586-8e27-40fe26ea93e7" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_IntercompanyDividendProceedsFinancing" xlink:label="loc_nrg_IntercompanyDividendProceedsFinancing_58c9792f-8caf-3119-d1a2-16b68ae8d9f3" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_nrg_IntercompanyDividendProceedsFinancing_58c9792f-8caf-3119-d1a2-16b68ae8d9f3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_a7dddef8-7428-8c2e-71aa-172073d99355" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_a7dddef8-7428-8c2e-71aa-172073d99355" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromHedgeFinancingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_5e2384e7-2100-07d0-2d64-67d581ee3a2f" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_PaymentsForProceedsFromHedgeFinancingActivities_5e2384e7-2100-07d0-2d64-67d581ee3a2f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_e5f1c7a4-b42a-8461-2001-b1f20e51b257" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_e5f1c7a4-b42a-8461-2001-b1f20e51b257" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfDebt" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfDebt_4a835f0d-f83e-e3a1-c436-34aa7468ed3b" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfDebt_4a835f0d-f83e-e3a1-c436-34aa7468ed3b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseDueFromAffiliates" xlink:label="loc_us-gaap_IncreaseDecreaseDueFromAffiliates_818271fe-1640-810f-193d-f92ef5182b97" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_IncreaseDecreaseDueFromAffiliates_818271fe-1640-810f-193d-f92ef5182b97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromPaymentsToMinorityShareholders" xlink:label="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_33aa2f92-cee3-127e-1218-9a80b3f74896" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_ProceedsFromPaymentsToMinorityShareholders_33aa2f92-cee3-127e-1218-9a80b3f74896" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_f19a6911-0ca9-0f7f-0ae8-f18c6d766244" xlink:type="locator" />
    <link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_f19a6911-0ca9-0f7f-0ae8-f18c6d766244" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_6d6aeea7-a141-90a2-c93a-b8ffdb3a558e" xlink:type="locator" />
    <link:calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_ef560d3a-690c-ef17-1fe6-55654352e2f7" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_6d6aeea7-a141-90a2-c93a-b8ffdb3a558e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_1250a129-7059-13df-3c61-0ce58f6c0edb" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations_1250a129-7059-13df-3c61-0ce58f6c0edb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_5d7fceea-1d34-9b88-c76d-3ea2d3986946" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_deb49b68-c030-7624-a39d-ea301caa5dbf" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_5d7fceea-1d34-9b88-c76d-3ea2d3986946" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_962cfc51-230d-a221-126b-1d12af7a5921" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_962cfc51-230d-a221-126b-1d12af7a5921" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets1" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_d5dace7e-16a2-02a1-4993-85329c91fc1e" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_d5dace7e-16a2-02a1-4993-85329c91fc1e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnDispositionOfIntangibleAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfIntangibleAssets_a1de4b98-8e53-a8ff-9c23-9f152320731c" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_GainLossOnDispositionOfIntangibleAssets_a1de4b98-8e53-a8ff-9c23-9f152320731c" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities" xlink:label="loc_nrg_ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities_bcaa31d9-7022-9b75-6255-16a04a6bca0d" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_nrg_ChangesInCollateralDepositsSupportingEnergyRiskManagementActivities_bcaa31d9-7022-9b75-6255-16a04a6bca0d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities_fd1e7593-ca9f-7490-e93f-03cded79a8ad" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInDerivativeAssetsAndLiabilities_fd1e7593-ca9f-7490-e93f-03cded79a8ad" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ChangesInNuclearDecommissioningTrustLiability" xlink:label="loc_nrg_ChangesInNuclearDecommissioningTrustLiability_385419d1-9f29-43b3-648f-16b68ae7b588" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_nrg_ChangesInNuclearDecommissioningTrustLiability_385419d1-9f29-43b3-648f-16b68ae7b588" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_32a1f577-1984-0dba-8328-1c5c7b04d5c1" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxes_32a1f577-1984-0dba-8328-1c5c7b04d5c1" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ImpairmentLosses" xlink:label="loc_nrg_ImpairmentLosses_c1c07e5a-e9e3-cd1f-0ac4-16b68b06631c" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_nrg_ImpairmentLosses_c1c07e5a-e9e3-cd1f-0ac4-16b68b06631c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_ShareBasedCompensation_e3eecf87-b290-4567-8a59-5b0a8e27c85b" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_AmortizationOfIntangiblesAndOutOfMarketContracts" xlink:label="loc_nrg_AmortizationOfIntangiblesAndOutOfMarketContracts_0af72d34-8063-196b-19f5-16a04ad6c1a1" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_nrg_AmortizationOfIntangiblesAndOutOfMarketContracts_0af72d34-8063-196b-19f5-16a04ad6c1a1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_e9a2cdf1-6f49-806b-7b55-b9320bcfa87f" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_e9a2cdf1-6f49-806b-7b55-b9320bcfa87f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfPowerContractsEmissionCredits" xlink:label="loc_us-gaap_AmortizationOfPowerContractsEmissionCredits_e3f0f46e-b4cc-0349-9a84-aead4260a083" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_AmortizationOfPowerContractsEmissionCredits_e3f0f46e-b4cc-0349-9a84-aead4260a083" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_3bb02469-191c-4baa-c8ee-e08be21b11bb" xlink:type="locator" />
    <link:calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_3bb02469-191c-4baa-c8ee-e08be21b11bb" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_IncomeLossfromEquityMethodInvestmentofUnconsolidatedAffiliates" xlink:label="loc_nrg_IncomeLossfromEquityMethodInvestmentofUnconsolidatedAffiliates_3C5114F9645C763891039FB53433B9A6" xlink:type="locator" />
    <link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_nrg_IncomeLossfromEquityMethodInvestmentofUnconsolidatedAffiliates_3C5114F9645C763891039FB53433B9A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_88b934f7-92d0-1533-191a-90f7368739a4" xlink:type="locator" />
    <link:calculationArc order="15" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_88b934f7-92d0-1533-191a-90f7368739a4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_41d34a64-5135-57ad-661a-9f86a4fee4f7" xlink:type="locator" />
    <link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_41d34a64-5135-57ad-661a-9f86a4fee4f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_9b039144-dc24-2381-1de5-20fa04e9b091" xlink:type="locator" />
    <link:calculationArc order="18" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_9b039144-dc24-2381-1de5-20fa04e9b091" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeconsolidationGainOrLossAmount" xlink:label="loc_us-gaap_DeconsolidationGainOrLossAmount_b3efd01c-3315-0ac7-d11f-123f3ebb1edb" xlink:type="locator" />
    <link:calculationArc order="19" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_us-gaap_DeconsolidationGainOrLossAmount_b3efd01c-3315-0ac7-d11f-123f3ebb1edb" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_GainsLossesOnExtinguishmentOfDebtNonCashPortion" xlink:label="loc_nrg_GainsLossesOnExtinguishmentOfDebtNonCashPortion_16a907b4-aae4-d4bb-66fa-16b68ac90ecd" xlink:type="locator" />
    <link:calculationArc order="20" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_444b1ac7-f47a-4ce3-0caa-537f7e4ab8c3" xlink:to="loc_nrg_GainsLossesOnExtinguishmentOfDebtNonCashPortion_16a907b4-aae4-d4bb-66fa-16b68ac90ecd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:type="locator" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_DividendsFromParentInvestingActivities" xlink:label="loc_nrg_DividendsFromParentInvestingActivities_7E271A8FC3D60E7F02FC908773D3BABA" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_nrg_DividendsFromParentInvestingActivities_7E271A8FC3D60E7F02FC908773D3BABA" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_IntercompanyDividendProceedsInvesting" xlink:label="loc_nrg_IntercompanyDividendProceedsInvesting_2535244c-92ae-42c0-f8f7-16b68add1aee" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_nrg_IntercompanyDividendProceedsInvesting_2535244c-92ae-42c0-f8f7-16b68add1aee" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessTwoNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessTwoNetOfCashAcquired_d71c0e93-5d55-326e-bc3c-b020eb341a90" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessTwoNetOfCashAcquired_d71c0e93-5d55-326e-bc3c-b020eb341a90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9d35c912-5b2d-89f7-eeb3-812a0511db5e" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9d35c912-5b2d-89f7-eeb3-812a0511db5e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fee12b15-6b42-6245-2e2f-ff030b98332c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInNotesReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInNotesReceivables_9909af37-f31f-9ff8-a609-9656a0d5e629" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_IncreaseDecreaseInNotesReceivables_9909af37-f31f-9ff8-a609-9656a0d5e629" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_3be9d1aa-8098-ddda-91ce-5e44ee6678ae" xlink:type="locator" />
    <link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_3be9d1aa-8098-ddda-91ce-5e44ee6678ae" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfIntangibleAssets" xlink:label="loc_us-gaap_ProceedsFromSaleOfIntangibleAssets_2391b34e-f2cf-15e2-081e-9bb5d3059c2a" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_ProceedsFromSaleOfIntangibleAssets_2391b34e-f2cf-15e2-081e-9bb5d3059c2a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecurities" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecurities_9cebbd9b-269e-5a19-54b8-1c32e2660d83" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecurities_9cebbd9b-269e-5a19-54b8-1c32e2660d83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_d3d89aab-5be8-f6a4-66e9-41f55e0839cd" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_d3d89aab-5be8-f6a4-66e9-41f55e0839cd" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_ProceedsFromRenewableEnergyGrants" xlink:label="loc_nrg_ProceedsFromRenewableEnergyGrants_6838ab80-9084-0a43-ec47-16b68ae751ef" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_nrg_ProceedsFromRenewableEnergyGrants_6838ab80-9084-0a43-ec47-16b68ae751ef" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromProductiveAssets" xlink:label="loc_us-gaap_PaymentsForProceedsFromProductiveAssets_57375985-43e7-7ca6-9fed-64b09729b579" xlink:type="locator" />
    <link:calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsForProceedsFromProductiveAssets_57375985-43e7-7ca6-9fed-64b09729b579" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates" xlink:label="loc_nrg_InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates_3ffffc84-0aed-4c7d-b779-16b68b6185bd" xlink:type="locator" />
    <link:calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_nrg_InvestmentsInProceedsFromSalesOfUnconsolidatedAffiliates_3ffffc84-0aed-4c7d-b779-16b68b6185bd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5eaab9ea-3795-2871-0d80-72b9662e37e6" xlink:type="locator" />
    <link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_2be04cf9-8ceb-0f9e-f8fc-88519ffff574" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_5eaab9ea-3795-2871-0d80-72b9662e37e6" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationCashFlowsDetailsCalc2" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationComprehensiveIncomeLossDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationStatementsOfOperationsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/CondensedConsolidatingFinancialInformationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeases" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeasesConvertibleSeniorNotesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeasesEnergyCenterMinneapolisSeriesNotesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeasesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeasesScheduleOfLongTermDebtAndCapitalLeasesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_c63917e8-031d-3018-e68e-e4b72c6d04b8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_c63917e8-031d-3018-e68e-e4b72c6d04b8" xlink:to="loc_us-gaap_LongTermDebt_7e14882f-7ab9-8302-20ff-24c510ab8806" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CapitalLeaseObligations" xlink:label="loc_us-gaap_CapitalLeaseObligations_8c9400f4-4889-e53e-3a54-2ecd9dd74a39" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_c63917e8-031d-3018-e68e-e4b72c6d04b8" xlink:to="loc_us-gaap_CapitalLeaseObligations_8c9400f4-4889-e53e-3a54-2ecd9dd74a39" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeasesScheduleOfLongTermDebtAndCapitalLeasesDetailsCalc2" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeasesSeniorNotesRepurchasedDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DebtAndCapitalLeasesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/EarningsLossPerShare" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/EarningsLossPerShareAntiDilutiveSecuritiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/EarningsLossPerShareReconciliationOfBasicAndDilutedEpsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_86e61cf2-b7b2-e230-65f1-5a2b152f3a30" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_86e61cf2-b7b2-e230-65f1-5a2b152f3a30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_cee10fe8-a4bb-491c-22f6-69a723d6a718" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_223fd9c8-68e8-e433-7c40-f98b238e79de" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_cee10fe8-a4bb-491c-22f6-69a723d6a718" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/EarningsLossPerShareTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/EnvironmentalMatters" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstruments" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_d444402b-921b-e0fa-119c-908ab66850af" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_AvailableForSaleSecurities_d444402b-921b-e0fa-119c-908ab66850af" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue_5f6018d7-d285-2195-0e06-87335af284f7" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue_5f6018d7-d285-2195-0e06-87335af284f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DecommissioningFundInvestments" xlink:label="loc_us-gaap_DecommissioningFundInvestments_ec2a45f5-ef82-1730-b4f2-7c5c23101b07" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_DecommissioningFundInvestments_ec2a45f5-ef82-1730-b4f2-7c5c23101b07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_62eb8c59-8348-bd48-683f-a9f1d164ff20" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_62eb8c59-8348-bd48-683f-a9f1d164ff20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_b851ddfc-ce9b-3407-931e-669b0dd9719b" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_b86af6cd-ef38-8a02-5297-9329a99c960d" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_b851ddfc-ce9b-3407-931e-669b0dd9719b" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsCounterpartyCreditRiskDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsDerivativeFairValueMeasurementsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsDerivativeFairValueMeasurementsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsEstimatedCarryingAmountsAndFairValueOfFinancialInstrumentsNotCarriedAtFairValueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsReconciliationOfLevel3FinancialInstrumentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/FairValueOfFinancialInstrumentsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/Impairments" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/ImpairmentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/IncomeTaxesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFund" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFundSummaryOfAggregateFairValuesAndRealizedGainsAndLossesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFundSummaryOfProceedsFromSalesOfAvailableForSaleSecuritiesAndRelatedGainsAndLossesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/NuclearDecommissioningTrustFundTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/RegulatoryMatters" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/RegulatoryMattersDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/RelatedPartyTransactionsCreditAgreementWithGenonDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/RelatedPartyTransactionsServiceAgreementAndTransitionServicesAgreementWithGenonDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SegmentReporting" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SegmentReportingDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_33076493-4882-6413-5de3-7bb85b9df3b7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_adacf05e-7e15-bd60-3e53-87432885dc29" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_b9914cca-4860-d701-8b49-ae2910ad372f" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SegmentReportingTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesCapacityRevenueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesContractAssetsAndLiabilitiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesDisaggregationOfRevenueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesNoncontrollingInterestDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesOtherBalanceSheetInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRecentAccountingDevelopmentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRedeemableNoncontrollingInterestDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_F31EBFB5AE1D523E80E30D894689292A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_B81753A90AF556E98679F228D7A9C0A9" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_F31EBFB5AE1D523E80E30D894689292A" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_B81753A90AF556E98679F228D7A9C0A9" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_FundsDepositedByCounterparties" xlink:label="loc_nrg_FundsDepositedByCounterparties_BBBAB346830E5A64A10388596C17C1F5" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_F31EBFB5AE1D523E80E30D894689292A" xlink:to="loc_nrg_FundsDepositedByCounterparties_BBBAB346830E5A64A10388596C17C1F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_857FE63CB3EB5C04BB609906BB258E14" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_F31EBFB5AE1D523E80E30D894689292A" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_857FE63CB3EB5C04BB609906BB258E14" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesOrVies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesOrViesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet_0162d0a5-821b-bfd6-f8a6-5139a569ffe6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_1c1292b8-64a2-b20e-0eee-c9bd4374ba96" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet_0162d0a5-821b-bfd6-f8a6-5139a569ffe6" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_1c1292b8-64a2-b20e-0eee-c9bd4374ba96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedAssetsCurrent" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedAssetsCurrent_6648db89-7754-147b-0611-7d58053fec7c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_1c1292b8-64a2-b20e-0eee-c9bd4374ba96" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedAssetsCurrent_6648db89-7754-147b-0611-7d58053fec7c" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_VariableInterestEntityConsolidatedCarryingAmountNetPropertyPlantandEquipment" xlink:label="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountNetPropertyPlantandEquipment_0ff0f813-dc8a-96fc-5671-16b68b4dc4cf" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_1c1292b8-64a2-b20e-0eee-c9bd4374ba96" xlink:to="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountNetPropertyPlantandEquipment_0ff0f813-dc8a-96fc-5671-16b68b4dc4cf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent_744af11d-aa01-9ec8-b43f-2d2db76b5d43" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_1c1292b8-64a2-b20e-0eee-c9bd4374ba96" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedAssetsNoncurrent_744af11d-aa01-9ec8-b43f-2d2db76b5d43" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_72333284-59b6-f135-bb15-d3fa829605c9" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet_0162d0a5-821b-bfd6-f8a6-5139a569ffe6" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_72333284-59b6-f135-bb15-d3fa829605c9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedLiabilitiesCurrent" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedLiabilitiesCurrent_7ca2c379-7df5-4820-6143-702231056870" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_72333284-59b6-f135-bb15-d3fa829605c9" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedLiabilitiesCurrent_7ca2c379-7df5-4820-6143-702231056870" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedLiabilitiesNoncurrent" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedLiabilitiesNoncurrent_ee913411-2b66-4319-aa40-b81382d4d297" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_72333284-59b6-f135-bb15-d3fa829605c9" xlink:to="loc_us-gaap_VariableInterestEntityConsolidatedLiabilitiesNoncurrent_ee913411-2b66-4319-aa40-b81382d4d297" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_VariableInterestEntityConsolidatedCarryingAmountLongtermDebt" xlink:label="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountLongtermDebt_a45af3ac-cbc0-f8b9-9ec8-16b68b9ddbbf" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities_72333284-59b6-f135-bb15-d3fa829605c9" xlink:to="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountLongtermDebt_a45af3ac-cbc0-f8b9-9ec8-16b68b9ddbbf" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_VariableInterestEntityConsolidatedCarryingAmountNoncontrollingInterest" xlink:label="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountNoncontrollingInterest_c6fa0353-c4c3-cbf5-8770-16b68afc4d9e" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet_0162d0a5-821b-bfd6-f8a6-5139a569ffe6" xlink:to="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountNoncontrollingInterest_c6fa0353-c4c3-cbf5-8770-16b68afc4d9e" xlink:type="arc" />
    <link:loc xlink:href="nrg-20180630.xsd#nrg_VariableInterestEntityConsolidatedCarryingAmountRedeemableNoncontrollingInterest" xlink:label="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountRedeemableNoncontrollingInterest_67087F400B4F6D67A5A3768A6295D4F6" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet_0162d0a5-821b-bfd6-f8a6-5139a569ffe6" xlink:to="loc_nrg_VariableInterestEntityConsolidatedCarryingAmountRedeemableNoncontrollingInterest_67087F400B4F6D67A5A3768A6295D4F6" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.nrgenergy.com/role/VariableInterestEntitiesOrViesTables" xlink:type="extended" />
</link:linkbase>
