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  <xs:element name="SupplementalDisclosureOfNoncashInvestingAndFinancingActivitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_SupplementalDisclosureOfNoncashInvestingAndFinancingActivitiesAbstract"/>
  <xs:element name="CustomerAdvancesAndDepositsDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_CustomerAdvancesAndDepositsDisclosureTextBlockAbstract"/>
  <xs:element name="CustomerAdvancesAndDepositsDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_CustomerAdvancesAndDepositsDisclosureTextBlock"/>
  <xs:element name="ScheduleOfForeignExchangeGainLossTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_ScheduleOfForeignExchangeGainLossTableTextBlock"/>
  <xs:element name="Note3MarketableSecuritiesTablesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note3MarketableSecuritiesTablesTable"/>
  <xs:element name="Note3MarketableSecuritiesTablesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note3MarketableSecuritiesTablesLineItems"/>
  <xs:element name="CashAndCashEquivalents_Domain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_CashAndCashEquivalents_Domain"/>
  <xs:element name="CashRestrictedUnderSecurityAgreementsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_CashRestrictedUnderSecurityAgreementsAbstract"/>
  <xs:element name="RestrictedCashAndCashEquivalentsCashAndCashEquivalentsDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsDomain"/>
  <xs:element name="ForeignExchangeGainLossAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_ForeignExchangeGainLossAbstract"/>
  <xs:element name="ForeignCurrencyDenominatedCertificatesOfDepositAndCashAccounts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="optt_ForeignCurrencyDenominatedCertificatesOfDepositAndCashAccounts"/>
  <xs:element name="PercentageOfTheCompanySRevenuesDerivedFromMajorCustomersAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_PercentageOfTheCompanySRevenuesDerivedFromMajorCustomersAbstract"/>
  <xs:element name="MarketableSecuritiesThatMatureWithinOneYearAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_MarketableSecuritiesThatMatureWithinOneYearAbstract"/>
  <xs:element name="Note3MarketableSecuritiesDetailsMarketableSecuritiesThatMatureWithinOneYearTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note3MarketableSecuritiesDetailsMarketableSecuritiesThatMatureWithinOneYearTable"/>
  <xs:element name="Note3MarketableSecuritiesDetailsMarketableSecuritiesThatMatureWithinOneYearLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note3MarketableSecuritiesDetailsMarketableSecuritiesThatMatureWithinOneYearLineItems"/>
  <xs:element name="BalanceSheetDetailAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_BalanceSheetDetailAbstract"/>
  <xs:element name="PropertyAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_PropertyAndEquipmentAbstract"/>
  <xs:element name="PatentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_PatentsAbstract"/>
  <xs:element name="AccruedExpensesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_AccruedExpensesAbstract"/>
  <xs:element name="AccruedExpensesRelatedToInvestmentInJointVenture" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="optt_AccruedExpensesRelatedToInvestmentInJointVenture"/>
  <xs:element name="WeightedAverageFairValueAssumptionsForStockBasedCompensationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_WeightedAverageFairValueAssumptionsForStockBasedCompensationAbstract"/>
  <xs:element name="StockOptionsUnderThePlansAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_StockOptionsUnderThePlansAbstract"/>
  <xs:element name="NonVestedRestrictedStockUnderThePlansAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_NonVestedRestrictedStockUnderThePlansAbstract"/>
  <xs:element name="Note7StockBasedCompensationDetailsNonVestedRestrictedStockUnderthePlansTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note7StockBasedCompensationDetailsNonVestedRestrictedStockUnderthePlansTable"/>
  <xs:element name="Note7StockBasedCompensationDetailsNonVestedRestrictedStockUnderthePlansLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note7StockBasedCompensationDetailsNonVestedRestrictedStockUnderthePlansLineItems"/>
  <xs:element name="GeographicSegmentInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_GeographicSegmentInformationAbstract"/>
  <xs:element name="ThreeMonthsEndedJuly312012Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_ThreeMonthsEndedJuly312012Abstract"/>
  <xs:element name="July312013Abstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_July312013Abstract"/>
  <xs:element name="CashAndCashEquivalentsMarketableSecuritiesAndRestrictedCash" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="optt_CashAndCashEquivalentsMarketableSecuritiesAndRestrictedCash"/>
  <xs:element name="DebtEquityandOtherSecuritiesUnderShelfRegistration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="optt_DebtEquityandOtherSecuritiesUnderShelfRegistration"/>
  <xs:element name="MaximumAmountOfCommonStockOfferedAvailableForSale" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="optt_MaximumAmountOfCommonStockOfferedAvailableForSale"/>
  <xs:element name="Note2SummaryofSignificantAccountingPoliciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note2SummaryofSignificantAccountingPoliciesDetailsTable"/>
  <xs:element name="Note2SummaryofSignificantAccountingPoliciesDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note2SummaryofSignificantAccountingPoliciesDetailsLineItems"/>
  <xs:element name="OwnershipPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="optt_OwnershipPercentage"/>
  <xs:element name="Note5DebtDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note5DebtDetailsTable"/>
  <xs:element name="Note5DebtDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note5DebtDetailsLineItems"/>
  <xs:element name="LongTermDebtPaymentTerms" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="optt_LongTermDebtPaymentTerms"/>
  <xs:element name="DeferredCreditsPayableOptionDetails" type="num:weightItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="optt_DeferredCreditsPayableOptionDetails"/>
  <xs:element name="DeferredCreditsPayableMarketDiscountRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="optt_DeferredCreditsPayableMarketDiscountRate"/>
  <xs:element name="DeferredCreditsPayableMarketLiquidatedDamagesRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="optt_DeferredCreditsPayableMarketLiquidatedDamagesRate"/>
  <xs:element name="Note7StockBasedCompensationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note7StockBasedCompensationDetailsTable"/>
  <xs:element name="Note7StockBasedCompensationDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note7StockBasedCompensationDetailsLineItems"/>
  <xs:element name="Note8CommitmentsandContingenciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note8CommitmentsandContingenciesDetailsTable"/>
  <xs:element name="Note8CommitmentsandContingenciesDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note8CommitmentsandContingenciesDetailsLineItems"/>
  <xs:element name="InputTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="optt_InputTax"/>
  <xs:element name="Note10OperatingSegmentsandGeographicInformationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note10OperatingSegmentsandGeographicInformationDetailsTable"/>
  <xs:element name="Note10OperatingSegmentsandGeographicInformationDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note10OperatingSegmentsandGeographicInformationDetailsLineItems"/>
  <xs:element name="Note11SubsequentEventDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="optt_Note11SubsequentEventDetailsTable"/>
  <xs:element name="Note11SubsequentEventDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_Note11SubsequentEventDetailsLineItems"/>
  <xs:element name="USDepartmentofEnergyMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_USDepartmentofEnergyMember"/>
  <xs:element name="AsiaandAustraliaMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_AsiaandAustraliaMember"/>
  <xs:element name="SpanishTaxAuthoritiesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_SpanishTaxAuthoritiesMember"/>
  <xs:element name="BarclaysBankAgreementMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_BarclaysBankAgreementMember"/>
  <xs:element name="ExpectedToVestMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_ExpectedToVestMember"/>
  <xs:element name="StockIncentivePlan2006Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_StockIncentivePlan2006Member"/>
  <xs:element name="LongTermMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_LongTermMember"/>
  <xs:element name="NJBPUAgreementMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_NJBPUAgreementMember"/>
  <xs:element name="AustraliaMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_AustraliaMember"/>
  <xs:element name="RelatedtolossoncontractMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_RelatedtolossoncontractMember"/>
  <xs:element name="NonEmployeeDirectorsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_NonEmployeeDirectorsMember"/>
  <xs:element name="PerformancebasedvestingMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_PerformancebasedvestingMember"/>
  <xs:element name="CheckingandsavingsaccountsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_CheckingandsavingsaccountsMember"/>
  <xs:element name="UnitedStatesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_UnitedStatesMember"/>
  <xs:element name="FederalMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_FederalMember"/>
  <xs:element name="CurrentYearMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_CurrentYearMember"/>
  <xs:element name="NewJerseyBoardofPublicUtilitiesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_NewJerseyBoardofPublicUtilitiesMember"/>
  <xs:element name="IncludingNon-employeeCompensationMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_IncludingNon-employeeCompensationMember"/>
  <xs:element name="NonvestedRestrictedStockMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_NonvestedRestrictedStockMember"/>
  <xs:element name="NewJerseyStateOperatingLossSoldMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_NewJerseyStateOperatingLossSoldMember"/>
  <xs:element name="UnitedKingdomMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_UnitedKingdomMember"/>
  <xs:element name="UKGovernmentsTechnologyStrategyBoardMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_UKGovernmentsTechnologyStrategyBoardMember"/>
  <xs:element name="IberdrolaCantabriaMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_IberdrolaCantabriaMember"/>
  <xs:element name="USTreasuryobligationsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_USTreasuryobligationsMember"/>
  <xs:element name="StateOfNewJerseyCommissionOnScienceAndTechnologyMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_StateOfNewJerseyCommissionOnScienceAndTechnologyMember"/>
  <xs:element name="ShortTermMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_ShortTermMember"/>
  <xs:element name="AdvancePaymentWavePortProjectMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_AdvancePaymentWavePortProjectMember"/>
  <xs:element name="OptionsGrantedToConsultantsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_OptionsGrantedToConsultantsMember"/>
  <xs:element name="EuropeanUnionWaverPortProjectMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_EuropeanUnionWaverPortProjectMember"/>
  <xs:element name="StockPlan2001Member" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_StockPlan2001Member"/>
  <xs:element name="NextFiveYearsMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_NextFiveYearsMember"/>
  <xs:element name="USNavyMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_USNavyMember"/>
  <xs:element name="CurrentMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_CurrentMember"/>
  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="optt_DocumentAndEntityInformationAbstract"/>
</xs:schema>
