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  <xs:element id="ale_WindTurbineGeneratorsMember" abstract="true" name="WindTurbineGeneratorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_EstimatedCapitalExpendituresIncludingPastExpenditures" abstract="false" name="EstimatedCapitalExpendituresIncludingPastExpenditures" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ale_MinnesotaPowerLandSalesMember" abstract="true" name="MinnesotaPowerLandSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_ALLETEBonds4.08DueMarch2029Member" abstract="true" name="ALLETEBonds4.08DueMarch2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_MedicarePartDRegulatoryAssetMember" abstract="true" name="MedicarePartDRegulatoryAssetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_SilverBayPowerMember" abstract="true" name="SilverBayPowerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_WholesaleAndRetailContraAfudcMember" abstract="true" name="WholesaleAndRetailContraAfudcMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_IncomeTaxExpenseBenefitDuetoSaleofSubsidiary" abstract="false" name="IncomeTaxExpenseBenefitDuetoSaleofSubsidiary" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ale_TenaskaPPAMember" abstract="true" name="TenaskaPPAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_AnticipatedAdditionalGeneratingCapacityMW" abstract="false" name="AnticipatedAdditionalGeneratingCapacityMW" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:powerItemType"/>
  <xs:element id="ale_GeneratingCapacityOwnedMW" abstract="false" name="GeneratingCapacityOwnedMW" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:powerItemType"/>
  <xs:element id="ale_ManitobaHydroPpaExpiresApril2022Member" abstract="true" name="ManitobaHydroPpaExpiresApril2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_BoswellUnit3Member" abstract="true" name="BoswellUnit3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_RateInformationByTypeDomain" abstract="true" name="RateInformationByTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_UnsecuredTermLoanVariableRateDue2022Member" abstract="true" name="UnsecuredTermLoanVariableRateDue2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_A20230101Member" abstract="true" name="A20230101Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ale_TransmissionFormulaRatesMember" abstract="true" name="TransmissionFormulaRatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
