<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-03-24T17:32:42.3768306+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : ef1edcd6cf53460194e0648feebf6bbd -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="watt_PercentageOfProportionateValueOfPutOptionForStock" name="PercentageOfProportionateValueOfPutOptionForStock" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_TaxCutsAndJobsActOf2017AccountingComplete1" name="TaxCutsAndJobsActOf2017AccountingComplete1" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_DeferredTaxAssetsStartUpAndOrganizationalCosts" name="DeferredTaxAssetsStartUpAndOrganizationalCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_DeferredTaxAssetsLeasingArrangements" name="DeferredTaxAssetsLeasingArrangements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="watt_TaxCreditResearchAndDevelopmentExpirationPeriod" name="TaxCreditResearchAndDevelopmentExpirationPeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_TaxCreditCarryforwardExpirationPeriod" name="TaxCreditCarryforwardExpirationPeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="watt_AgreementAxis" name="AgreementAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_AgreementDomain" name="AgreementDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_ContractServicesMember" name="ContractServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="watt_DialogSemiconductorPlcMember" name="DialogSemiconductorPlcMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" 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:schema>
