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        <EOYAmt>0</EOYAmt>
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        <EOYAmt>58384049</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>59697626</BOYAmt>
        <EOYAmt>58384049</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>3539164</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>-4852741</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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      <OtherSecuritiesGrp>
        <Desc>MP UNION MASTER TRUST UNITS</Desc>
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        <MethodValuationCd>C</MethodValuationCd>
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      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>8607764</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>2023421</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>2023421</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>6584343</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>-26939</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>-26939</RevenueNotReportedFinclStmtAmt>
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      <TotExpnsEtcAuditedFinclStmtAmt>3018106</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>3018106</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>134</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>134</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>3018240</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MODIFIED CASH BASIS OF ACCOUNTING REQUIRES PLAN MANAGEMENT TO EVALUATE TAX POSITIONS TAKEN BY THE PLAN AND RECOGNIZE A TAX LIABILITY (OR ASSET) IF THE PLAN HAS TAKEN AN UNCERTAIN POSITION THAT, MORE LIKELY THAN NOT, WOULD NOT BE SUSTAINED UPON EXAMINATION BY THE DEPARTMENT OF LABOR OR INTERNAL REVENUE SERVICE. PLAN MANAGEMENT HAS ANALYZED THE TAX POSITIONS TAKEN BY THE PLAN, AND HAS CONCLUDED THAT AS OF DECEMBER 31, 2024, THERE ARE NO UNCERTAIN POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION OF A LIABILITY (OR ASSET) OR DISCLOSURE IN THE FINANCIAL STATEMENTS. THE PLAN IS SUBJECT TO ROUTINE AUDITS BY TAXING JURISDICTIONS; HOWEVER, THERE ARE CURRENTLY NO AUDITS FOR ANY TAX PERIODS IN PROGRESS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>MODIFIED CASH BASIS TO ACCRUAL ADJUSTMENT -26,939.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>MODIFIED CASH BASIS TO ACCRUAL ADJUSTMENT 134.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TRUST IS RUN BY A GROUP OF 10 BOARD OF GOVERNORS WHICH CONSISTS OF 3 SELECTED BY THE EXECUTIVE MANAGEMENT TEAM REPRESENTING NON-UNION EMPLOYEES OF THE COMPANY AT THE RANK OF SUPERVISOR OR ABOVE, 3 SELECTED BY THE UNION REPRESENTING UNION EMPLOYEES, 3 SELECTED BY AND REPRESENTING NON-UNION EMPLOYEES BELOW THE RANK OF SUPERVISOR AND 1 SELECTED BY AND REPRESENTING PARTICIPATING RETIREES. ALTERNATE MEMBERS OF THE BOARD SHALL BE DESIGNATED BY EACH PARTICIPANT GROUP SO THAT AN ALTERNATE REPRESENTATIVE SHALL ATTEND EACH MEETING IN THE ABSENCE OF A MEMBER.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS NOT REVIEWED BY THE BOARD OF GOVERNORS, BUT THE FINANCIAL STATEMENT RESULTS ARE DISCUSSED AT THE BOARD MEETINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL OF THE MEMBERS OF THE BOARD OF GOVERNORS ARE REQUIRED BY THE COMPANY TO ATTEND ETHICS TRAINING ON AN ANNUAL BASIS TO TO DISCLOSE ANY POTENTIAL CONFLICTS OF INTEREST TO THE BOARD OF GOVERNORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FINANCIAL STATEMENTS OF THE TRUST AND ITS CONFLICT OF INTEREST POLICY ARE AVAILABLE TO ITS MEMBERS BY A WRITTEN REQUEST TO THE BOARD OF GOVERNORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>TRANSFER OF ASSETS TO OTHER ALLETE PLANS -4,852,741.</ExplanationTxt>
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    </IRS990ScheduleO>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>ALLETE INC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>30 WEST SUPERIOR STREET</AddressLine1Txt>
          <CityNm>DULUTH</CityNm>
          <StateAbbreviationCd>MN</StateAbbreviationCd>
          <ZIPCd>55802</ZIPCd>
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        <EIN>410418150</EIN>
        <PrimaryActivitiesTxt>UTILITY</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MN</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
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      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
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      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
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      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
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          <BusinessNameLine1Txt>ALLETE INC</BusinessNameLine1Txt>
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          <BusinessNameLine1Txt>ALLETE INC</BusinessNameLine1Txt>
        </OtherOrganizationName>
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          <BusinessNameLine1Txt>ALLETE INC</BusinessNameLine1Txt>
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        <InvolvedAmt>4852741</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>N/A</MethodOfAmountDeterminationTxt>
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