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<!-- DFIN New ActiveDisclosure (SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2023-08-14T14:57:38.9554+00:00 -->
<!-- Copyright (c) 2023 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
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  <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_IssuanceCostOfCommonStockAndWarrants" name="IssuanceCostOfCommonStockAndWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <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_IncreaseDecreaseInAccruedSeveranceExpense" name="IncreaseDecreaseInAccruedSeveranceExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="watt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOthertHanOptionsNotYetGrantsInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOthertHanOptionsNotYetGrantsInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_IncreaseDecreaseInOperatingLeaseRightOfUseAssets" name="IncreaseDecreaseInOperatingLeaseRightOfUseAssets" 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_ShareBasedCompensationArrangementShareBasedPaymentAwardOptionsVestedInPeriodShares" name="ShareBasedCompensationArrangementShareBasedPaymentAwardOptionsVestedInPeriodShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <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_QuarterlyPaymentForServiceAgreement" name="QuarterlyPaymentForServiceAgreement" 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_DialogMember" name="DialogMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
</xsd:schema>
