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  <xs:element name="WarrantyActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_WarrantyActivityAbstract"/>
  <xs:element name="InventoriesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_InventoriesAbstract"/>
  <xs:element name="PropertyAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_PropertyAndEquipmentAbstract"/>
  <xs:element name="ContractsInProgressAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ContractsInProgressAbstract"/>
  <xs:element name="SummaryOfCostsAndEstimatedEarningsOnContractsInProgressAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SummaryOfCostsAndEstimatedEarningsOnContractsInProgressAbstract"/>
  <xs:element name="SummaryOfDebtComponentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SummaryOfDebtComponentsAbstract"/>
  <xs:element name="SummaryOfGeographicSalesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SummaryOfGeographicSalesAbstract"/>
  <xs:element name="SummaryOfGeographicLongLivedAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SummaryOfGeographicLongLivedAssetsAbstract"/>
  <xs:element name="SummaryOfWarrantActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SummaryOfWarrantActivityAbstract"/>
  <xs:element name="StockBasedCompensationExpenseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_StockBasedCompensationExpenseAbstract"/>
  <xs:element name="StockOptionFairValueMeasurementAssumptionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_StockOptionFairValueMeasurementAssumptionsAbstract"/>
  <xs:element name="SummaryOfOptionActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SummaryOfOptionActivityAbstract"/>
  <xs:element name="SummaryOfRestrictedStockUnitActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SummaryOfRestrictedStockUnitActivityAbstract"/>
  <xs:element name="PreferredStockParValue00001PerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_PreferredStockParValue00001PerShareAbstract"/>
  <xs:element name="Authorized2000000SharesIn2015And2014Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_Authorized2000000SharesIn2015And2014Abstract"/>
  <xs:element name="CommonStockParValue00001PerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CommonStockParValue00001PerShareAbstract"/>
  <xs:element name="Authorized15000000SharesIn2015And2014Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_Authorized15000000SharesIn2015And2014Abstract"/>
  <xs:element name="IssuedAndOutstanding10013169AtMarch312015AndAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_IssuedAndOutstanding10013169AtMarch312015AndAbstract"/>
  <xs:element name="DiscontinuedOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_DiscontinuedOperationsAbstract"/>
  <xs:element name="NetIncomeLossPerShareBasicAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_NetIncomeLossPerShareBasicAbstract"/>
  <xs:element name="NetIncomeLossPerShareDilutedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_NetIncomeLossPerShareDilutedAbstract"/>
  <xs:element name="WeightedAverageSharesUsedInComputingNetIncomeLossPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_WeightedAverageSharesUsedInComputingNetIncomeLossPerShareAbstract"/>
  <xs:element name="OtherComprehensiveIncomeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_OtherComprehensiveIncomeAbstract"/>
  <xs:element name="CashFlowsFromOperatingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CashFlowsFromOperatingActivitiesAbstract"/>
  <xs:element name="AdjustmentsToReconcileNetIncomeLossToNetCashUsedInOperatingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_AdjustmentsToReconcileNetIncomeLossToNetCashUsedInOperatingActivitiesAbstract"/>
  <xs:element name="ChangesInOperatingAssetsAndLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ChangesInOperatingAssetsAndLiabilitiesAbstract"/>
  <xs:element name="CashFlowsFromInvestingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CashFlowsFromInvestingActivitiesAbstract"/>
  <xs:element name="CashFlowsFromFinancingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CashFlowsFromFinancingActivitiesAbstract"/>
  <xs:element name="ClassificationOfCashAndCashEquivalentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ClassificationOfCashAndCashEquivalentsAbstract"/>
  <xs:element name="SupplementalInformationNonCashFinancingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SupplementalInformationNonCashFinancingActivitiesAbstract"/>
  <xs:element name="NumeratorAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_NumeratorAbstract"/>
  <xs:element name="DenominatorAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_DenominatorAbstract"/>
  <xs:element name="BalanceSheetClassificationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_BalanceSheetClassificationAbstract"/>
  <xs:element name="AdjustmentsToAdditionalPaidInCapitalWarrantExercised" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="efoi_AdjustmentsToAdditionalPaidInCapitalWarrantExercised"/>
  <xs:element name="StockIssuedDuringPeriodSharesWarrantsExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_StockIssuedDuringPeriodSharesWarrantsExercised"/>
  <xs:element name="ContractsInProgressTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ContractsInProgressTextBlock"/>
  <xs:element name="ScheduleOfContractsInProgressTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ScheduleOfContractsInProgressTableTextBlock"/>
  <xs:element name="CostsInExcessOfShortfallFromBillings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="efoi_CostsInExcessOfShortfallFromBillings"/>
  <xs:element name="Note8GeographicInformationDetailsSummaryofGeographicSalesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="efoi_Note8GeographicInformationDetailsSummaryofGeographicSalesTable"/>
  <xs:element name="Note8GeographicInformationDetailsSummaryofGeographicSalesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_Note8GeographicInformationDetailsSummaryofGeographicSalesLineItems"/>
  <xs:element name="Note8GeographicInformationDetailsSummaryofGeographicLongLivedAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="efoi_Note8GeographicInformationDetailsSummaryofGeographicLongLivedAssetsTable"/>
  <xs:element name="Note8GeographicInformationDetailsSummaryofGeographicLongLivedAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_Note8GeographicInformationDetailsSummaryofGeographicLongLivedAssetsLineItems"/>
  <xs:element name="WarrantsExercisedWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_WarrantsExercisedWeightedAverageExercisePrice"/>
  <xs:element name="WarrantsForfeitedWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_WarrantsForfeitedWeightedAverageExercisePrice"/>
  <xs:element name="WarrantsExpiredWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_WarrantsExpiredWeightedAverageExercisePrice"/>
  <xs:element name="Note10StockholdersEquityDetailsSummaryofRestrictedStockUnitActivityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="efoi_Note10StockholdersEquityDetailsSummaryofRestrictedStockUnitActivityTable"/>
  <xs:element name="Note10StockholdersEquityDetailsSummaryofRestrictedStockUnitActivityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_Note10StockholdersEquityDetailsSummaryofRestrictedStockUnitActivityLineItems"/>
  <xs:element name="Note2BasisofPresentationandSummaryofSignificantAccountingPoliciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="efoi_Note2BasisofPresentationandSummaryofSignificantAccountingPoliciesDetailsTable"/>
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  <xs:element name="NumberOfCustomers" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_NumberOfCustomers"/>
  <xs:element name="StandardProductWarrantyTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_StandardProductWarrantyTerm"/>
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  <xs:element name="LineOfCreditFacilityAvailablePercentageOfReceivables" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_LineOfCreditFacilityAvailablePercentageOfReceivables"/>
  <xs:element name="LineOfCreditFacilityAvailableThresholdPercent" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="efoi_LineOfCreditFacilityAvailableThresholdPercent"/>
  <xs:element name="LineOfCreditFacilityAvailableThresholdValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="efoi_LineOfCreditFacilityAvailableThresholdValue"/>
  <xs:element name="LineOfCreditFacilityAvailablePercentOfEligibleSales" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_LineOfCreditFacilityAvailablePercentOfEligibleSales"/>
  <xs:element name="Note9IncomeTaxesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="efoi_Note9IncomeTaxesDetailsTable"/>
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  <xs:element name="Note11RelatedPartyTransactionsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="efoi_Note11RelatedPartyTransactionsDetailsTable"/>
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  <xs:element name="RelatedPartyTransactionTermOfAgreement" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_RelatedPartyTransactionTermOfAgreement"/>
  <xs:element name="CommissionFeePercent" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CommissionFeePercent"/>
  <xs:element name="Note12CommitmentsandContingenciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="efoi_Note12CommitmentsandContingenciesDetailsTable"/>
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  <xs:element name="AdditionalCommitedPaymentMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_AdditionalCommitedPaymentMember"/>
  <xs:element name="AvailableAfterIRCSection382LimitationsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_AvailableAfterIRCSection382LimitationsMember"/>
  <xs:element name="BorrowingOnAccountsReceivableMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_BorrowingOnAccountsReceivableMember"/>
  <xs:element name="BorrowingOnInventoriesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_BorrowingOnInventoriesMember"/>
  <xs:element name="BorrowingOnOverdraftsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_BorrowingOnOverdraftsMember"/>
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  <xs:element name="CustomerOneTwoAndThreeMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CustomerOneTwoAndThreeMember"/>
  <xs:element name="CustomerOneandTwoMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CustomerOneandTwoMember"/>
  <xs:element name="FiveElementsEfficientiesBVILtdMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_FiveElementsEfficientiesBVILtdMember"/>
  <xs:element name="InternationalMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_InternationalMember"/>
  <xs:element name="InventoryMaximumValueMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_InventoryMaximumValueMember"/>
  <xs:element name="MerlToyerVEnergyFocusIncMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_MerlToyerVEnergyFocusIncMember"/>
  <xs:element name="PercentageOfInventoryLowerOfCostOrMarketValueMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_PercentageOfInventoryLowerOfCostOrMarketValueMember"/>
  <xs:element name="Plan2014Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_Plan2014Member"/>
  <xs:element name="PoolAndCommercialProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_PoolAndCommercialProductsMember"/>
  <xs:element name="ToolingMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ToolingMember"/>
  <xs:element name="UncertaintyOnTheCollectionOfEscrowMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_UncertaintyOnTheCollectionOfEscrowMember"/>
  <xs:element name="UnsecuredPromissoryNoteQuercusTrustMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_UnsecuredPromissoryNoteQuercusTrustMember"/>
  <xs:element name="YehMeiChengMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_YehMeiChengMember"/>
  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_DocumentAndEntityInformationAbstract"/>
</xs:schema>
