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  <xsd:element id="watt_WarrantLiability" name="WarrantLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="watt_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_ConcentrationRiskNumberOfCustomers" name="ConcentrationRiskNumberOfCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_StockIssuedDuringPeriodIssuanceCostsAndFairValueOfLiabilityWarrant" name="StockIssuedDuringPeriodIssuanceCostsAndFairValueOfLiabilityWarrant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="watt_CommonStockRemainEligibleToBeIssued" name="CommonStockRemainEligibleToBeIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="watt_TwoCustomerMember" name="TwoCustomerMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_EmployeeMember" name="EmployeeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element name="AmendedAndRestatedSeveranceAndChangeInControlAgreementMember" id="watt_AmendedAndRestatedSeveranceAndChangeInControlAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EntitlementToNumberOfMonthsSalary" id="watt_EntitlementToNumberOfMonthsSalary" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="OutstandingUnvestedEquityAwardsScheduledToVestInNumberOfMonthsCessationBenefits" id="watt_OutstandingUnvestedEquityAwardsScheduledToVestInNumberOfMonthsCessationBenefits" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ReimbursementForContinuedCobraPaymentsPeriodFromTerminationDate" id="watt_ReimbursementForContinuedCobraPaymentsPeriodFromTerminationDate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="OperatingLeaseReductionInRightOfUseAssetDueToAdjustmentInDiscountRate" id="watt_OperatingLeaseReductionInRightOfUseAssetDueToAdjustmentInDiscountRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AmountOfReductionInRightOfUseAssetDueToAdjustmentInDiscountRate." id="watt_AmountOfReductionInRightOfUseAssetDueToAdjustmentInDiscountRate." type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="CommonStockOrPreFundedWarrantMember" id="watt_CommonStockOrPreFundedWarrantMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PreFundedWarrantMember" id="watt_PreFundedWarrantMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="WarrantsInitialValuation" id="watt_WarrantsInitialValuation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="CapitalSharesReservedForFutureIssuance" id="watt_CapitalSharesReservedForFutureIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="PerformanceSharesUnitPlan2015Member" id="watt_PerformanceSharesUnitPlan2015Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CommonStockCapitalSharesReservedForFutureIssuanceTableTextBlock" id="watt_CommonStockCapitalSharesReservedForFutureIssuanceTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ExpiringOnFebruaryTwentyTwoThousandTwentyNineMember" id="watt_ExpiringOnFebruaryTwentyTwoThousandTwentyNineMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="StockIssuedDuringPeriodValueNetRefundDueToEmployeesEmployeeStockPurchaseProgram" id="watt_StockIssuedDuringPeriodValueNetRefundDueToEmployeesEmployeeStockPurchaseProgram" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="StockIssuedDuringPeriodSharesNetRefundDueToEmployeesEmployeeStockPurchaseProgram" id="watt_StockIssuedDuringPeriodSharesNetRefundDueToEmployeesEmployeeStockPurchaseProgram" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="StockIssuedDuringPeriodSharesExerciseOfPrefundedWarrants" id="watt_StockIssuedDuringPeriodSharesExerciseOfPrefundedWarrants" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="FairValueAssetsLevel1ToLevel2TransfersAmount1" id="watt_FairValueAssetsLevel1ToLevel2TransfersAmount1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="FairValueAssetsLevel2ToLevel1TransfersAmount1" id="watt_FairValueAssetsLevel2ToLevel1TransfersAmount1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="FairValueLiabilitiesLevel1ToLevel2TransfersAmount1" id="watt_FairValueLiabilitiesLevel1ToLevel2TransfersAmount1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="FairValueLiabilitiesLevel2ToLevel1TransfersAmount1" id="watt_FairValueLiabilitiesLevel2ToLevel1TransfersAmount1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TwoThousandTwentyFourEquityIncentivePlanMember" id="watt_TwoThousandTwentyFourEquityIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ExecutiveOfficersAndVicePresidentsMember" id="watt_ExecutiveOfficersAndVicePresidentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PriorAtMarketProgramMember" id="watt_PriorAtMarketProgramMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AccelerateVestingPercentageUnvestedEquityAwards" id="watt_AccelerateVestingPercentageUnvestedEquityAwards" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentAdditionalFaceAmount" id="watt_DebtInstrumentAdditionalFaceAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="RegulationOfferingMember" id="watt_RegulationOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UnitIssuedDuringPeriodUnitsNewIssues" id="watt_UnitIssuedDuringPeriodUnitsNewIssues" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfSharesIssuedPerUnit" id="watt_NumberOfSharesIssuedPerUnit" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="MonthlyLeasePaymentsRemainderOfFiscalYear" id="watt_MonthlyLeasePaymentsRemainderOfFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="SeriesConvertiblePreferredStockMember" id="watt_SeriesConvertiblePreferredStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NumberOfWarrantsIssuedPerUnit" id="watt_NumberOfWarrantsIssuedPerUnit" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfWarrantsIssuedPerUnitToPurchaseCommonStock" id="watt_NumberOfWarrantsIssuedPerUnitToPurchaseCommonStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="CommonStockAtExercisePriceOf1.50PerShareMember" id="watt_CommonStockAtExercisePriceOf1.50PerShareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CommonStockAtExercisePriceOf2.00PerShareMember" id="watt_CommonStockAtExercisePriceOf2.00PerShareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SaleOfStockPricePerUnit" id="watt_SaleOfStockPricePerUnit" type="srt-types:perUnitItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="UnitIssuedDuringPeriodValueNewIssues" id="watt_UnitIssuedDuringPeriodValueNewIssues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="CommonStockSharesAvailableForSaleAmount" id="watt_CommonStockSharesAvailableForSaleAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ExpenseRelatedToLicenseAgreement" id="watt_ExpenseRelatedToLicenseAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NewTermLoanMember" id="watt_NewTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
