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  <xsd:element id="watt_OfferingCostsRelatedToWarrantLiability" name="OfferingCostsRelatedToWarrantLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="watt_CommitmentsAndContingenciesLineItems" name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_WarrantsTwoThousandTwentyThreeMember" name="WarrantsTwoThousandTwentyThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_OperatingLeaseMonthlyRentalExpense" name="OperatingLeaseMonthlyRentalExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_WarrantsOrRightsExercisableTerm" name="WarrantsOrRightsExercisableTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_EmployeeContributionThroughPayrollWithholdings" name="EmployeeContributionThroughPayrollWithholdings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_WarrantsPolicyPolicyTextBlock" name="WarrantsPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_ExpiringOnMarchTwentyEightTwoThousandTwentyNineMember" name="ExpiringOnMarchTwentyEightTwoThousandTwentyNineMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_OfferingCostsAllocatedToWarrants" name="OfferingCostsAllocatedToWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_StrategicAllianceAgreementMember" name="StrategicAllianceAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_IncreaseDecreaseInAccruedSeveranceExpense" name="IncreaseDecreaseInAccruedSeveranceExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_ShareBasedCompensationArrangementByShareBasedPaymentAwardUnamortizedValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardUnamortizedValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_PercentageOfProportionateValueOfPutOptionForStock" name="PercentageOfProportionateValueOfPutOptionForStock" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_StockIssuedDuringPeriodSharesPerformanceShareUnits" name="StockIssuedDuringPeriodSharesPerformanceShareUnits" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_TwoThousandsSeventeenEquityInducementPlanMember" name="TwoThousandsSeventeenEquityInducementPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_WarrantLiabilityDisclosureTextBlock" name="WarrantLiabilityDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_StockIssuedDuringPeriodValueAtTheMarketOffering" name="StockIssuedDuringPeriodValueAtTheMarketOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="watt_AtTheMarketFundsReceivable" name="AtTheMarketFundsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_ProductDevelopmentProjectsRevenueMember" name="ProductDevelopmentProjectsRevenueMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_CommitmentsAndContingenciesTable" name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_IssuanceCostOfCommonStockAndWarrants" name="IssuanceCostOfCommonStockAndWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_SeveranceExpenseMember" name="SeveranceExpenseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_CommonStockOutstandingDescription" name="CommonStockOutstandingDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_StockIssuedDuringPeriodSharesAtTheMarketOffering" name="StockIssuedDuringPeriodSharesAtTheMarketOffering" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_NumberOfCommonStockVotingEntitlementPerShare" name="NumberOfCommonStockVotingEntitlementPerShare" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="watt_PaymentsOfStockIssuanceCostsAccountingExpense" name="PaymentsOfStockIssuanceCostsAccountingExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="watt_ProceedsFromIssuanceAtTheMarketOffering" name="ProceedsFromIssuanceAtTheMarketOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <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="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" />
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  <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:element name="Rule10b51ArrangementModifiedFlag" id="watt_Rule10b51ArrangementModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NonRule10b51ArrangementModifiedFlag" id="watt_NonRule10b51ArrangementModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="StockIssuedDuringPeriodSharesSaleOfCommonStockToChiefExecutiveOfficerValue" id="watt_StockIssuedDuringPeriodSharesSaleOfCommonStockToChiefExecutiveOfficerValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="StockIssuedDuringPeriodSharesSaleOfCommonStockToChiefExecutiveOfficer" id="watt_StockIssuedDuringPeriodSharesSaleOfCommonStockToChiefExecutiveOfficer" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TaxCreditCarryForwardExpirationPeriod" id="watt_TaxCreditCarryForwardExpirationPeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ComputerHardwareMember" id="watt_ComputerHardwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DeferredTaxAssetsStartUpAndOrganizationalCosts" id="watt_DeferredTaxAssetsStartUpAndOrganizationalCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DeferredTaxAssetsLeasingArrangements" id="watt_DeferredTaxAssetsLeasingArrangements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationMarkToMarketWarrantLiability" id="watt_EffectiveIncomeTaxRateReconciliationMarkToMarketWarrantLiability" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PrepaidExpensesAndOtherCurrentAssetsTextBlock" id="watt_PrepaidExpensesAndOtherCurrentAssetsTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PrepaidSoftwareAndSupport" id="watt_PrepaidSoftwareAndSupport" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PrepaidAndDeferredFinancing" id="watt_PrepaidAndDeferredFinancing" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PrepaidSubscriptions" id="watt_PrepaidSubscriptions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TradeshowDeposits" id="watt_TradeshowDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="OtherDepositAssetsCurrent" id="watt_OtherDepositAssetsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="InsurancePremiumFinancingMember" id="watt_InsurancePremiumFinancingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ShortTermDebtNumberOfInstallments" id="watt_ShortTermDebtNumberOfInstallments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentPaymentMultiplier" id="watt_DebtInstrumentPaymentMultiplier" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="AccountsReceivableFactoringFeeDiscountExpense" id="watt_AccountsReceivableFactoringFeeDiscountExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="InterestAccruedNotYetPaid" id="watt_InterestAccruedNotYetPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="FinancingOfInsurancePremium" id="watt_FinancingOfInsurancePremium" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ProceedsFromAccountsReceivableUnderFactoringAgreement" id="watt_ProceedsFromAccountsReceivableUnderFactoringAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AccountsReceivableUnderFactoringAgreement" id="watt_AccountsReceivableUnderFactoringAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="December2024ProspectusSupplementMember" id="watt_December2024ProspectusSupplementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PrepaidFinancingExpense" id="watt_PrepaidFinancingExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="RepaymentsOfFinancedInsurancePremium" id="watt_RepaymentsOfFinancedInsurancePremium" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtInstrumentSettlementValue" id="watt_DebtInstrumentSettlementValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="OriginalLoanAgreementMember" id="watt_OriginalLoanAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AmendedLoanAgreementMember" id="watt_AmendedLoanAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationChangeInTaxReservesPercent" id="watt_EffectiveIncomeTaxRateReconciliationChangeInTaxReservesPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationFederalStatutoryIncomeTaxRate" id="watt_EffectiveIncomeTaxRateReconciliationFederalStatutoryIncomeTaxRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="CommonStockValueIssuedForRestrictedStockUnits" id="watt_CommonStockValueIssuedForRestrictedStockUnits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
</xsd:schema>
