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  <element name="DisclosureRegulatoryAssetsAndReclassificationFromTheRegulatoryAssetIntoPurchasedGasAbstract" id="utl_DisclosureRegulatoryAssetsAndReclassificationFromTheRegulatoryAssetIntoPurchasedGasAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="EnvironmentalMattersMember" id="utl_EnvironmentalMattersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FederalAndStateMember" id="utl_FederalAndStateMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="GasTransportationAndStorageMember" id="utl_GasTransportationAndStorageMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="IRSThresholdForAmountOfRefundSubjectToReviewByIRSAndJointCommitteeOfCongress" id="utl_IRSThresholdForAmountOfRefundSubjectToReviewByIRSAndJointCommitteeOfCongress" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="LetterOfCreditFacilityAndBankGuaranteesOutstanding" id="utl_LetterOfCreditFacilityAndBankGuaranteesOutstanding" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="NaturalGasPurchaseContractMember" id="utl_NaturalGasPurchaseContractMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="PortionOfStormCostsDeferredPendingApprovalOfRequestToRecover" id="utl_PortionOfStormCostsDeferredPendingApprovalOfRequestToRecover" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="ScheduleOfAssumptionsUsedInCalculatingNetPeriodicBenefitCostTableTextBlock" id="utl_ScheduleOfAssumptionsUsedInCalculatingNetPeriodicBenefitCostTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="SeniorNotesSixPointNineFivePercentDueDecemberThreeTwentyEighteenMember" id="utl_SeniorNotesSixPointNineFivePercentDueDecemberThreeTwentyEighteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorNotesSixPointThreeThreePercentDueMayOneTwentyTwentyTwoMember" id="utl_SeniorNotesSixPointThreeThreePercentDueMayOneTwentyTwentyTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorSecuredNotesEightPointZeroZeroPercentDueThroughAugustOneTwentySeventeenMember" id="utl_SeniorSecuredNotesEightPointZeroZeroPercentDueThroughAugustOneTwentySeventeenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesEightMember" id="utl_SeriesEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesFiveMember" id="utl_SeriesFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeriesSixMember" id="utl_SeriesSixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SettlementDates" id="utl_SettlementDates" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SettlementGainDetailAxis" id="utl_SettlementGainDetailAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="SettlementGainDetailDomain" id="utl_SettlementGainDetailDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAnnualVestingPercentage" id="utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAnnualVestingPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedInPeriodWeightedAverageGrantDateFairValue" id="utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDate" id="utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber" id="utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableForGrantRestrictedStockUnitsGrantedInPeriod" id="utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableForGrantRestrictedStockUnitsGrantedInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnitsIssued" id="utl_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnitsIssued" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SignificantAccountingPoliciesLineItems" id="utl_SignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SignificantAccountingPoliciesTable" id="utl_SignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SnowStormMember" id="utl_SnowStormMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StormExpenditures" id="utl_StormExpenditures" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SupremeCourtMember" id="utl_SupremeCourtMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TropicalStormIreneMember" id="utl_TropicalStormIreneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitilEnergySystemsIncMember" id="utl_UnitilEnergySystemsIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnitilRealtyCorpMember" id="utl_UnitilRealtyCorpMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UtilitiesMember" id="utl_UtilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UtilitiesOperatingExpenseConservationAndLoadManagement" id="utl_UtilitiesOperatingExpenseConservationAndLoadManagement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VolumeOfEnergyCommodityContractsNaturalGas" id="utl_VolumeOfEnergyCommodityContractsNaturalGas" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="YearOnePolicyMember" id="utl_YearOnePolicyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="YearTwoPolicyMember" id="utl_YearTwoPolicyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
