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    <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
    <import namespace="http://xbrl.sec.gov/currency/2017-01-31" schemaLocation="http://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd" />
    <element id="OPTT_CustomerAdvancesAndDepositsDisclosureTextBlock" name="CustomerAdvancesAndDepositsDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_WarrantDisclosureTextBlock" name="WarrantDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_WarrantLiabilityCurrent" name="WarrantLiabilityCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_AdoptionOfAccountingStandardUpdateRelatedToStockCompensationAccounting" name="AdoptionOfAccountingStandardUpdateRelatedToStockCompensationAccounting" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_NumberOfFinancingAgreementsClosed" name="NumberOfFinancingAgreementsClosed" nillable="true" xbrli:periodType="duration" type="xbrli:integerItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ClassOfWarrantOrRightExpirationPeriod" name="ClassOfWarrantOrRightExpirationPeriod" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_DeferredCreditsPayableMarketDiscountRate" name="DeferredCreditsPayableMarketDiscountRate" nillable="true" xbrli:periodType="instant" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_DeferredCreditsPayableMarketLiquidatedDamagesRate" name="DeferredCreditsPayableMarketLiquidatedDamagesRate" nillable="true" xbrli:periodType="instant" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_LitigationSettlementAmountPaidByInsurer" name="LitigationSettlementAmountPaidByInsurer" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_InputTax" name="InputTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ForeignTaxExaminationRefund" name="ForeignTaxExaminationRefund" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ScheduleOfCashCashEquivalentsAndRestrictedCashTableTextBlock" name="ScheduleOfCashCashEquivalentsAndRestrictedCashTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ChangesOnValueOfWarrantLiabilityTableTextBlock" name="ChangesOnValueOfWarrantLiabilityTableTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_WarrantLiabilityPolicyPolicyTextBlock" name="WarrantLiabilityPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_DeferredCreditsPayableOptionDetails" name="DeferredCreditsPayableOptionDetails" nillable="true" xbrli:periodType="instant" type="num:massItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OptionFeeAmount" name="OptionFeeAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SecuritiesPurchaseAgreementMember" name="SecuritiesPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PlacementAgentsMember" name="PlacementAgentsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PlacementAgentFeesMember" name="PlacementAgentFeesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PocketAndLegalExpensesMember" name="PocketAndLegalExpensesMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SecondAmendedPurchaseAgreementMember" name="SecondAmendedPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OfferingAgreementMember" name="OfferingAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OneAgreementMember" name="OneAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_BarclaysBankMember" name="BarclaysBankMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_EURMember" name="EURMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_CheckingAndSavingsAccountsMember" name="CheckingAndSavingsAccountsMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_OvernightRepurchaseAccountMember" name="OvernightRepurchaseAccountMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_MoneyMarketAccountMember" name="MoneyMarketAccountMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_BarclaysBankAgreementMember" name="BarclaysBankAgreementMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_SantanderBankMember" name="SantanderBankMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_MitsuiEngineeringAndShipBuildingMember" name="MitsuiEngineeringAndShipBuildingMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_USDepartmentOfDefenseOfficeOfNavalResearchMember" name="USDepartmentOfDefenseOfficeOfNavalResearchMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ProductDevelopmentMember" name="ProductDevelopmentMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ServiceBasedVestingMember" name="ServiceBasedVestingMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_PerformanceBasedVestingMember" name="PerformanceBasedVestingMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_NonVestedRestrictedStockMember" name="NonVestedRestrictedStockMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_WarrantLiabilityMember" name="WarrantLiabilityMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_StipulationMember" name="StipulationMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_ReverseStockSplitMember" name="ReverseStockSplitMember" nillable="true" xbrli:periodType="duration" type="nonnum:domainItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_DeferredCreditPayableAbstract" name="DeferredCreditPayableAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="OPTT_WarrantsAbstract" name="WarrantsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
</schema>
