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  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
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  <import namespace="http://fasb.org/us-gaap/2014-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd" />
  <import namespace="http://xbrl.sec.gov/country/2013-01-31" schemaLocation="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd" />
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  <element name="FiniteLivedIntangibleAssetsForeignCurrencyTranslationAdjustments" id="ppsi_FiniteLivedIntangibleAssetsForeignCurrencyTranslationAdjustments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
  <element id="ppsi_StatedInterestRatesForNotesReceivable" name="StatedInterestRatesForNotesReceivable" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_LongTermDebtAndCapitalLeaseObligations1" name="LongTermDebtAndCapitalLeaseObligations1" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
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  <element name="CanadianCreditFacilitiesAMember" id="ppsi_CanadianCreditFacilitiesAMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
  <element name="CanadianCreditFacilitiesBMember" id="ppsi_CanadianCreditFacilitiesBMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
  <element name="CanadianCreditFacilitiesCMember" id="ppsi_CanadianCreditFacilitiesCMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
  <element id="ppsi_LineOfCreditFacilitySecuredAmount" name="LineOfCreditFacilitySecuredAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="ppsi_MinimumFixedCoverageRatio" name="MinimumFixedCoverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element name="TermCreditFacilityMember" id="ppsi_TermCreditFacilityMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
  <element name="ClassOfWarrantOrRightExpirationDateRangeEnd" id="ppsi_ClassOfWarrantOrRightExpirationDateRangeEnd" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
  <element id="ppsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm3" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm3" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
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  <element id="ppsi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm2" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm2" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element name="OthersCountriesMember" id="ppsi_OthersCountriesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
  <element id="ppsi_EquityBasedAntidilutiveSharesMember" name="EquityBasedAntidilutiveSharesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_NumberOfPromissoryNotes" name="NumberOfPromissoryNotes" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_Numerator" name="Numerator" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="ppsi_Denominator" name="Denominator" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="ppsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTermRollForward" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTermRollForward" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="ppsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueRollForward" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueRollForward" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="ppsi_LongTermIncentivePlanTwentyElevenMember" name="LongTermIncentivePlanTwentyElevenMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_EarningsBeforeIncomeTaxesDepreciationAndAmortizationBenchmarkRatio" name="EarningsBeforeIncomeTaxesDepreciationAndAmortizationBenchmarkRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="ppsi_TermLoanFacilityMember" name="TermLoanFacilityMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_DateRangeTwoMember" name="DateRangeTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_DateRangeThreeMember" name="DateRangeThreeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_LondonInterbankOfferedRateEurodollarLoanMember" name="LondonInterbankOfferedRateEurodollarLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_PercentageOfOwnershipInSubsidiaryPerAgreementAsCollateral" name="PercentageOfOwnershipInSubsidiaryPerAgreementAsCollateral" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_LondonInterbankOfferedRatePlusFundsBorrowedInUnitesStatesDollarsMember" name="LondonInterbankOfferedRatePlusFundsBorrowedInUnitesStatesDollarsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_BaseRatePlusFundsBorrowedInUnitedStatesDollarsMember" name="BaseRatePlusFundsBorrowedInUnitedStatesDollarsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_BaseRatePlusFundsBorrowedInUsdOrCadMember" name="BaseRatePlusFundsBorrowedInUsdOrCadMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_BaseRatePlusFundsBorrowedInCadMember" name="BaseRatePlusFundsBorrowedInCadMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_BankOfMontrealMember" name="BankOfMontrealMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_ForgivenessOfTradePayablesAndIndebtedness" name="ForgivenessOfTradePayablesAndIndebtedness" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="ppsi_CriticalPowerSolutionsSegmentMember" name="CriticalPowerSolutionsSegmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_TAndDSolutionsSegmentMember" name="TAndDSolutionsSegmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_TitanEnergyWorldwideIncorporatedMember" name="TitanEnergyWorldwideIncorporatedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_HarmonicsHoldingsIncorporatedMember" name="HarmonicsHoldingsIncorporatedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_BusinessCombinationLocationWithinAcquireesSegment" name="BusinessCombinationLocationWithinAcquireesSegment" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_BusinessCombinationPrimaryFormOfConsideration" name="BusinessCombinationPrimaryFormOfConsideration" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_DeferredPurchasePriceDueToSellerMember" name="DeferredPurchasePriceDueToSellerMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_ForgivenessTradePayablesAndIndebtednessToPurchaserMember" name="ForgivenessTradePayablesAndIndebtednessToPurchaserMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="ppsi_PioneerElectrogroupCanadaIncorporatedMember" name="PioneerElectrogroupCanadaIncorporatedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
</schema>
