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        <Desc>Purchased Power</Desc>
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        <Desc>Transmission Costs</Desc>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>4000411</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>-44525</NetUnrlzdGainsLossesInvstAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
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      <TotalBookValueLandBuildingsAmt>158182453</TotalBookValueLandBuildingsAmt>
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        <Desc>Accrued Interest Receivable</Desc>
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        <Desc>Investments in Associated Organizations</Desc>
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        <Desc>Other special deposit</Desc>
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      <OtherLiabilitiesOrgGrp>
        <Desc>Deferred Credit Pirkey Mine Closing</Desc>
        <Amt>3908309</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Power Costs Levelized Billings</Desc>
        <Amt>1153525</Amt>
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      <TotalLiabilityAmt>5061834</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>221520049</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueSubtotalAmt>221520049</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>221520049</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>217519638</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>217519638</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>217519638</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>Financial Accounting Standards Board Codification Section 740 requires recognition,measurement and disclosure of uncertain tax positions. The Cooperative currently accounts for uncertain tax positions based on the estimated likelihood of assessment and has not determined that any tax positions require an accrual based on current standards of accounting. For federal income tax purposes the tax returns essentially remain open for possible examination for a period of three years after the date on which those returns are filed.</ExplanationTxt>
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        <PersonNm>Caleb Head</PersonNm>
        <TitleTxt>Controller</TitleTxt>
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        <OtherCompensationFilingOrgAmt>178</OtherCompensationFilingOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>28772</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>164332</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jason Atwood</PersonNm>
        <TitleTxt>VP Engineering</TitleTxt>
        <BaseCompensationFilingOrgAmt>185000</BaseCompensationFilingOrgAmt>
        <OtherCompensationFilingOrgAmt>896</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>72863</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>29349</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>288108</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Richard Tyler</PersonNm>
        <TitleTxt>GM/CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>260000</BaseCompensationFilingOrgAmt>
        <OtherCompensationFilingOrgAmt>3812</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>169096</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>29734</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>462642</TotalCompensationFilingOrgAmt>
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    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="17005038" softwareVersionNum="2017v2.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 4: Description of Significant Changes to Organizational Documents</FormAndLineReferenceDesc>
        <ExplanationTxt>During the year, the organization implemented a revised Patronage Capital Policy and a new Equity Management Policy, which addressed, among other items, issues such as patronage capital allocations and retirements. Sections 3 &amp; 4 of the organizations bylaws, which address capital credits, were revised to ensure consistency between the new Policies and the language in the bylaws.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6: Explanation of Classes of Members or Shareholder</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization is an electric power generation &amp; transmission cooperative that furnishes electric power requirements to six electric distribution cooperatives who are members of this organization.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>A copy of the form 990 is mailed to each director prior to its filing and is also reviewed and approved at the next board of directors meeting.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>The conflict of interests policy requires that each official annually disclose interests to the board that could create the appearance of a conflict of interest and certify that they have received and reviewed a copy of the conflict of interests policy.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>The board of directors reviews and approves the officer compensation and benefits package on an annual basis with a decision based on the vote of the entire board of directors.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>The cooperative's governing documents, conflicts of interest policy and financial statements are available to the public by submitting a written request to the cooperative.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Association Dues: Column (A) - Total = $315988; Column (B) - Program Services = $315988; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>EPA Expense - Dolet Hills: Column (A) - Total = $691833; Column (B) - Program Services = $691833; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>EPA Expense - Pirkey: Column (A) - Total = $522840; Column (B) - Program Services = $522840; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Fuel Cost - Credit: Column (A) - Total = $613317; Column (B) - Program Services = $613317; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Fuel Cost - Dolet Hills: Column (A) - Total = $4916773; Column (B) - Program Services = $4916773; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Maint/Sup/Engineering: Column (A) - Total = $0; Column (B) - Program Services = $0; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Misc. General Expense: Column (A) - Total = $93015; Column (B) - Program Services = $93015; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Operating Expense - HCPP: Column (A) - Total = $9413017; Column (B) - Program Services = $9413017; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Plant Overhead Costs: Column (A) - Total = $1604261; Column (B) - Program Services = $1604261; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Power Plant Operating Exp.: Column (A) - Total = $10021108; Column (B) - Program Services = $10021108; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Property Taxes: Column (A) - Total = $9858; Column (B) - Program Services = $9858; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Reimbursed Expenses: Column (A) - Total = $0; Column (B) - Program Services = $0; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>SCADA Operating Expense: Column (A) - Total = $0; Column (B) - Program Services = $0; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e: Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Steam Expense - Pirkey &amp; Dolet: Column (A) - Total = $1862078; Column (B) - Program Services = $1862078; Column (C) - Management &amp; General = $0; Column (D) - Fundraising = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Decreases</FormAndLineReferenceDesc>
        <ExplanationTxt>Patronage Capital Retired = -$2000000</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>