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        <Desc>Purchased Power</Desc>
        <TotalAmt>94381209</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>RPS Compliance</Desc>
        <TotalAmt>362397</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Membership Dues and Subscriptions</Desc>
        <TotalAmt>120901</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Member Appreciation</Desc>
        <TotalAmt>56933</TotalAmt>
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        <TotalAmt>8590</TotalAmt>
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        <TotalAmt>96822923</TotalAmt>
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        <EOYAmt>0</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>364059</BOYAmt>
        <EOYAmt>142879</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>0</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>0</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
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      <InvestmentsOtherSecuritiesGrp>
        <BOYAmt>21016460</BOYAmt>
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      <InvestmentsProgramRelatedGrp>
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      <OtherAssetsTotalGrp>
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        <EOYAmt>36182</EOYAmt>
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        <BOYAmt>33721152</BOYAmt>
        <EOYAmt>32121261</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>10421551</BOYAmt>
        <EOYAmt>7851398</EOYAmt>
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      <LoansFromOfficersDirectorsGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
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      <OtherLiabilitiesGrp>
        <BOYAmt>920000</BOYAmt>
        <EOYAmt>920000</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>11341551</BOYAmt>
        <EOYAmt>8771398</EOYAmt>
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      <OrgDoesNotFollowFASB117Ind>X</OrgDoesNotFollowFASB117Ind>
      <CapStkTrPrinCurrentFundsGrp>
        <BOYAmt>0</BOYAmt>
        <EOYAmt>0</EOYAmt>
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      <PdInCapSrplsLandBldgEqpFundGrp>
        <BOYAmt>3900</BOYAmt>
        <EOYAmt>3900</EOYAmt>
      </PdInCapSrplsLandBldgEqpFundGrp>
      <RtnEarnEndowmentIncmOthFndsGrp>
        <BOYAmt>22375701</BOYAmt>
        <EOYAmt>23345963</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>22379601</BOYAmt>
        <EOYAmt>23349863</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>33721152</BOYAmt>
        <EOYAmt>32121261</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>0</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>970262</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleD documentId="IRS990ScheduleD" softwareId="23017437" softwareVersionNum="2023v5.1">
      <OtherSecuritiesGrp>
        <Desc>PATRONAGE CAPITAL CREDITS &amp; MEMBERSHIPS</Desc>
        <BookValueAmt>12914527</BookValueAmt>
        <MethodValuationCd>C</MethodValuationCd>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>INVESTMENT SECURITIES MATURING WITHIN A YEAR</Desc>
        <BookValueAmt>7779512</BookValueAmt>
        <MethodValuationCd>C</MethodValuationCd>
      </OtherSecuritiesGrp>
      <TotalBookValueSecuritiesAmt>20694039</TotalBookValueSecuritiesAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>MEMBER / CUSTOMER DEPOSITS</Desc>
        <Amt>920000</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>920000</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>96822923</TotalRevEtcAuditedFinclStmtAmt>
      <OtherRevenueAmt>0</OtherRevenueAmt>
      <RevenueNotReportedAmt>0</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>96822923</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>0</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>96822923</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>95852661</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>0</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>95852661</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>970262</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>970262</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>96822923</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Member - Customer Deposits: Cooperative member's deposits required by their contracts. $920,000</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part X, Line 2 FIN 48 (ASC 740) footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>WPMC is a not-for-profit corporation generally exempt from income tax under Section 501(c)(12) of the Internal Revenue Code. Activities with non-member customers are subject to federal income taxes. WPMC had no federal income tax liability at December 31, 2023 and 2022. Only activities with non-member customers would be subject to Michigan corporate income tax.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part XII, Line 4(b) Other expenses in form 990 not in audited financial statements</FormAndLineReferenceDesc>
        <ExplanationTxt>Patronage Allocated to Member Owners - 970262</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="IRS990ScheduleI" softwareId="23017437" softwareVersionNum="2023v5.1">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Michigan Tech Fund</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1400 Townsend Dr</AddressLine1Txt>
          <CityNm>Houghton</CityNm>
          <StateAbbreviationCd>MI</StateAbbreviationCd>
          <ZIPCd>49931</ZIPCd>
        </USAddress>
        <RecipientEIN>381554664</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>General Support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Ferris Foundation</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>420 Oak Street</AddressLine1Txt>
          <CityNm>Big Rapids</CityNm>
          <StateAbbreviationCd>MI</StateAbbreviationCd>
          <ZIPCd>49307</ZIPCd>
        </USAddress>
        <RecipientEIN>386115813</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>General Support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Saginaw Valley State University</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>7400 Bay Road</AddressLine1Txt>
          <CityNm>University Center</CityNm>
          <StateAbbreviationCd>MI</StateAbbreviationCd>
          <ZIPCd>48710</ZIPCd>
        </USAddress>
        <RecipientEIN>381798800</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>General Support</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>3</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule I, Part I, Line 2 Procedures for monitoring use of grant funds.</FormAndLineReferenceDesc>
        <ExplanationTxt>The Coop makes a general donation directly to each University's scholarship fund program or foundation. Each University or its scholarship foundation selects the scholarship recipients and handles the distribution of funds, so no further monitoring of the funds is required by the Coop.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="23017437" softwareVersionNum="2023v5.1">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b Other Compensation</FormAndLineReferenceDesc>
        <ExplanationTxt>The Cooperative's member-customers are represented by a Board of Directors ("BOD") elected by the membership. The BOD is entitled to receive a daily per diem for meetings attended, a quarterly retainer fee, and reimbursement of actual out of pocket expenses. As such, in accordance with the Form 990 instructions for Part IV, Section B, Line 15B has been answered no. For all directors listed in Part VII, the per diem and quarterly retainer fee reimbursement is reported in Part VII, Section A, Column D, however in many instances the payment is made directly to the member organization that the director represents, based on the following policy. Each member, with a director on board, has four options for compensation: (1) The member declines its director's per diem and quarterly fee, but the director is reimbursed for all out-of-pocket expenses. (2) The member chooses to have its director's per diem, quarterly retainer fee, and director's expense paid directly to its director for which a yearly form 1099-NEC will be issued to them. (3) The member chooses to have its director's per diem, quarterly retainer fee, and director's expenses paid directly to itself, which is a member of the cooperative. (4) The member chooses to have its director's compensation and expenses donated by the cooperative on an annual basis to the charitable organization of the member's choice. In 2023 only directors Brian Taivalkoski, Dan Taylor, and Leandro Saez received director compensation for which a 1099-NEC was issued to the individual.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a Officer Compensation</FormAndLineReferenceDesc>
        <ExplanationTxt>The CEO and CFO are included in the agreement for management and administrative services with Wolverine and are neither employees nor independent contractors of WPMC. As such, in accordance with the Form 990 instructions for Part IV, Section B, Line 15A has been answered no.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 1a Delegate broad authority to a committee</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Committee and Nominating Committee shall consist of the Chairperson and not more than two (2) additional members of the Board of Directors. The committees have the powers and authority to conduct the general management of the affairs of the Coop as are regularly exercised by such committee directors' overall control and direction.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 3 Delegation of management duties</FormAndLineReferenceDesc>
        <ExplanationTxt>WPMC ENTERED INTO AN AGREEMENT FOR MANAGEMENT AND ADMINISTRATIVE SERVICES WITH WOLVERINE. THE AGREEMENT REQUIRES WPMC TO PAY WOLVERINE A FEE FOR MANAGEMENT, MARKETING, AND OTHER ADMINISTRATIVE SERVICES RENDERED UNDER THE AGREEMENT. TOTAL FEES INCURRED UNDER THIS AGREEMENT IN 2023 WERE $587,098; $353,135 OF WHICH WAS FOR THE WORK OF WPMC'S OFFICERS: DANIEL H. DECOEUR (CEO), AND RICHARD M. KOHLER (CFO).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6 Classes of members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>WPMC IS A COOPERATIVE, AND AS SUCH, IT HAS MEMBERS WHO OWN IT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a Members or stockholders electing members of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>WPMC'S MEMBERS ELECT REPRESENTATIVES TO THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7b Decisions requiring approval by members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>WHILE WPMC'S BOARD OF DIRECTORS ("BOD") IS EMPOWERED TO MAKE MOST BUSINESS DECISIONS, A FEW KEY DECISIONS MUST BE MADE BY A VOTE OF WPMC'S MEMBERS, SUCH AS AMENDING THE BYLAWS AND ELECTING BOD MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 8b Documentation of meetings held by committees of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>WPMC'S BOARD DOES NOT HAVE ANY COMMITTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>PRIOR TO FILING THE FORM 990 ALL OF THE FOLLOWING REVIEWS TOOK PLACE: 1) THE CFO REVIEWED THE FORM 990 IN DETAIL, 2) THE PRESIDENT &amp; CEO REVIEWED THE GENERAL CONTENT OF THE FORM 990, 3) A COMPLETE COPY OF THE FORM 990 WAS DISTRIBUTED TO EACH BOARD MEMBER FOR THEIR REVIEW, AND 4) AN OUTSIDE CPA REVIEWED THE FORM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH YEAR, THE BOARD DIRECTORS AND OFFICERS RESPOND IN WRITING TO A QUESTIONNAIRE ABOUT POTENTIAL CONFLICTS OF INTEREST. THESE RESPONSES ARE REVIEWED BY ACCOUNTING AND MADE AVAILABLE TO THE COOPERATIVE'S INDEPENDENT AUDITORS AS PART OF THEIR ANNUAL REVIEW. ANY CONFLICT (OR THE APPEARANCE OF A CONFLICT) OF INTEREST WOULD BE ADDRESSED AS SOON AS IT IS DISCOVERED. IF A CONFLICT IS DETERMINED TO OCCUR, THE PERSON INVOLVED IN THE CONFLICT IS RECUSED FROM PARTICIPATING IN THE DISCUSSION AND VOTING ON THE MATTER.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS AVAILABLE UPON REQUEST. WPMC DOES NOT MAKE GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICIES, OR FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9 Other changes in net assets or fund balances</FormAndLineReferenceDesc>
        <ExplanationTxt>Patronage Allocated to Members - 970262;</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990 General Explanation</FormAndLineReferenceDesc>
        <ExplanationTxt>WOLVERINE POWER MARKETING COOPERATIVE, THE ORGANIZATION FILING THIS TAX RETURN, IS REFERRED TO AS "WPMC", AND WOLVERINE POWER SUPPLY COOPERTIVE, INC., IS REFERRED TO AS "WOLVERINE" IN ALL EXPLANATIONS ON THIS FORM.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>