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  <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"/>
  <xs:element name="CashPaymentByTheCompanyMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CashPaymentByTheCompanyMember"/>
  <xs:element name="CognovitNoteKeystoneRubyLLCMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CognovitNoteKeystoneRubyLLCMember"/>
  <xs:element name="CommunalMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CommunalMember"/>
  <xs:element name="ContingentPaymentProjectedAnnualBillingsPeriodInMonthsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ContingentPaymentProjectedAnnualBillingsPeriodInMonthsMember"/>
  <xs:element name="ConvertiblePromissoryNoteTLCInvestmentsLLCMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ConvertiblePromissoryNoteTLCInvestmentsLLCMember"/>
  <xs:element name="CreditLineBorrowingsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_CreditLineBorrowingsMember"/>
  <xs:element name="FiveElementsEfficientiesBVILtdMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_FiveElementsEfficientiesBVILtdMember"/>
  <xs:element name="ForgivenessOfNetReceivableDueTheCompanyMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ForgivenessOfNetReceivableDueTheCompanyMember"/>
  <xs:element name="GovernmentProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_GovernmentProductsMember"/>
  <xs:element name="InternationalMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_InternationalMember"/>
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  <xs:element name="NumberOfDaysStockPriceMustTradeAboveCeilingToTriggerAdditionalFeeMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_NumberOfDaysStockPriceMustTradeAboveCeilingToTriggerAdditionalFeeMember"/>
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  <xs:element name="PoolAndCommercialProductsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_PoolAndCommercialProductsMember"/>
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  <xs:element name="ProductsSegmentMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ProductsSegmentMember"/>
  <xs:element name="ReleasedFromEscrowMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ReleasedFromEscrowMember"/>
  <xs:element name="ResearchAndDevelopmentServicesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_ResearchAndDevelopmentServicesMember"/>
  <xs:element name="SegementsTotalMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SegementsTotalMember"/>
  <xs:element name="SolutionsSegmentMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SolutionsSegmentMember"/>
  <xs:element name="SpecialFeeMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_SpecialFeeMember"/>
  <xs:element name="StoneRiverCompaniesLLCMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_StoneRiverCompaniesLLCMember"/>
  <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="UnderwritersMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_UnderwritersMember"/>
  <xs:element name="UnsecuredConvertibleNotesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="efoi_UnsecuredConvertibleNotesMember"/>
  <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>
