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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BOB KROEGER</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DUSTIN TRIPP</PersonNm>
        <TitleTxt>CO-OP MANAGER/DIRECTOR</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DAVID JOHNSTON</PersonNm>
        <TitleTxt>CO-OP MANAGER/DIRECTOR</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ALAN WATTLES</PersonNm>
        <TitleTxt>CO-OP MANAGER/DIRECTOR</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MATT CONKLIN</PersonNm>
        <TitleTxt>CO-OP MANAGER/DIRECTOR</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SHANE HERMETZ</PersonNm>
        <TitleTxt>CO-OP MANAGER/DIRECTOR</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LUKE JOHNSON</PersonNm>
        <TitleTxt>CO-OP MANAGER/DIRECTOR</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DONALD GULLEY</PersonNm>
        <TitleTxt>PRESIDENT &amp; CEO</TitleTxt>
        <AverageHoursPerWeekRt>60.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>681228</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>186970</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PAUL FURTAK</PersonNm>
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        <ReportableCompFromOrgAmt>211470</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>241978</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>WENDELL RAY WATSON</PersonNm>
        <TitleTxt>DIRECTOR OF ENVIRONMENTAL SERVICES</TitleTxt>
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        <KeyEmployeeInd>X</KeyEmployeeInd>
        <ReportableCompFromOrgAmt>200780</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>133890</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ROBERT CONN</PersonNm>
        <TitleTxt>MANAGER GENERATION &amp; FUEL</TitleTxt>
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        <OtherCompensationAmt>120064</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ASHLEY MCCUAN</PersonNm>
        <TitleTxt>VP OF POWER SUPPLY</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>96968</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LARRY BURNS</PersonNm>
        <TitleTxt>VP OF MARKETS &amp; POWER DELIVERY</TitleTxt>
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        <KeyEmployeeInd>X</KeyEmployeeInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES CRABB</PersonNm>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JERRY BEERS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>HAL DEWAYNE WHITLOCK</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES HENRY COZART</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GARY MICHAEL CHAMNESS</PersonNm>
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      <ContractorCompensationGrp>
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        <ContractorAddress>
          <USAddress>
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      <ContractorCompensationGrp>
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          <BusinessName>
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      <ContractorCompensationGrp>
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          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>POWER SERVICES GROUP INC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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        </ContractorAddress>
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      <ProgramServiceRevenueGrp>
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        <Desc>OTHER INCOME</Desc>
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        <EOYAmt>700</EOYAmt>
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        <EOYAmt>0</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>670440755</EOYAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
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      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleD documentId="RetDoc1040000001">
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        <BookValueAmt>18388081</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>823921379</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>333809229</DepreciationAmt>
        <BookValueAmt>490112150</BookValueAmt>
      </BuildingsGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>13301329</OtherCostOrOtherBasisAmt>
        <BookValueAmt>13301329</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>521801560</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>POST-RETIREMENT BENEFIT RESERVE</Desc>
        <Amt>9229445</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>RESERVE FOR ASSET RETIREMENT OBLIGATION</Desc>
        <Amt>2220477</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>11449922</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>191722760</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueNotReportedAmt>0</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>191722760</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>102154</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>102154</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>191824914</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>185202589</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>185202589</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>102154</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>102154</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>185304743</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COOPERATIVE ADOPTED THE PROVISIONS OF ASC TOPIC 740-10-25, "INCOME TAXES RECOGNITION". WHEN TAX RETURNS ARE FILED, IT IS HIGHLY CERTAIN THAT SOME POSITIONS TAKEN WOULD BE SUSTAINED UPON EXAMINATION BY THE TAXING AUTHORITIES, WHILE OTHER POSITIONS TAKEN OR THE AMOUNT OF THE POSITION TAKEN WOULD NOT BE SUSTAINED. EXAMPLES OF TAX POSITIONS COMMON TO ELECTRIC COOPERATIVES INCLUDE THE ENTITY TAKING A POSITION OF TAX EXEMPT STATUS. THE BENEFIT OF A TAX POSITION IS RECOGNIZED IN THE FINANCIAL STATEMENTS IN THE PERIOD DURING WHICH, BASED ON ALL AVAILABLE EVIDENCE, MANAGEMENT BELIEVES IT IS MORE LIKELY THAN NOT THAT THE POSITION WILL BE SUSTAINED UPON EXAMINATION. THE PORTION THAT EXCEEDS THE AMOUNT MEASURED AS DESCRIBED ABOVE IS REFLECTED AS A LIABILITY FOR UNCERTAIN TAX BENEFITS ALONG WITH ANY ASSOCIATED INTEREST AND PENALTIES THAT WOULD BE PAYABLE TO THE TAXING AUTHORITIES UPON EXAMINATION. AS OF DECEMBER 31, 2022 AND 2021, THE COOPERATIVE HAS DETERMINED THERE WERE NO UNCERTAIN TAX LIABILITIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCRETION EXPENSE 102,154.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>ACCRETION EXPENSE 102,154.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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        <PersonNm>DONALD GULLEY</PersonNm>
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        <TotalCompensationFilingOrgAmt>868198</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <PersonNm>PAUL FURTAK</PersonNm>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <PersonNm>WENDELL RAY WATSON</PersonNm>
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        <DeferredCompensationFlngOrgAmt>106948</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>334670</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ROBERT CONN</PersonNm>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>93322</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>26742</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>302733</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LARRY BURNS</PersonNm>
        <TitleTxt>VP OF MARKETS &amp; POWER DELIVERY</TitleTxt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>281014</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ASHLEY MCCUAN</PersonNm>
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        <TotalCompensationFilingOrgAmt>261568</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <PersonNm>JAMES CRABB</PersonNm>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>HAL DEWAYNE WHITLOCK</PersonNm>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
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        <PersonNm>JAMES HENRY COZART</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>DUSTIN TRIPP (CO-OP MANAGER), WILLIAM LITTRELL (DIRECTOR), DAVID JOHNSTON (CO-OP MANAGER), LUKE JOHNSON (CO-OP MANAGER), KEVIN LIEFER (DIRECTOR), SHANE HERMETZ (CO-OP MANAGER), ALAN WATTLES (CO-OP MANAGER), MATT CONKLIN (CO-OP MANAGER) AND BOB KROEGER (CO-OP MANAGER) HAVE A BUSINESS RELATIONSHIP WITH EACH OTHER THROUGH A COMMON COMPANY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>SOUTHERN ILLINOIS POWER COOPERATIVE HAS A TOTAL OF SEVEN MEMBERS WHICH ARE ALL ELECTRIC DISTRIBUTION COOPERATIVES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH OF THE SEVEN MEMBER DISTRIBUTION COOPERATIVES APPOINTS FOUR INDIVIDUALS TO SERVE AS DIRECTORS ON THE SOUTHERN ILLINOIS POWER COOPERATIVE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PREPARED BY AN INDEPENDENT ACCOUNTING FIRM FOR MANAGEMENT REVIEW. ONCE COMPLETED, IT IS CIRCULATED TO ALL BOARD MEMBERS FOR FINAL APPROVAL BEFORE BEING FILED WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>SIPC REQUIRES THAT DIRECTORS AND EMPLOYEES CONDUCT THEMSELVES IN AN ETHICAL MANNER AND AVOID IMPROPER CONDUCT AT ALL TIMES EVEN THOUGH SUCH CONDUCT MAY NOT BE EXPLICITLY PROHIBITED BY THE CONFLICT OF INTEREST POLICY. EMPLOYEES AND DIRECTORS SHALL IMMEDIATELY DISCLOSE ANY SITUATION THEY ARE INVOLVED IN WHICH MAY BE IN VIOLATION OF THIS POLICY, OR WHICH MIGHT POTENTIALLY VIOLATE THE INTENT OF THIS POLICY AT SOME FUTURE DATE. IN THE EVENT THAT ANY DIRECTOR OR EMPLOYEE BELIEVES THAT A VIOLATION OF THIS POLICY OR OTHER ILLEGAL OR UNETHICAL CONDUCT BY ANY EMPLOYEE, OFFICER OR DIRECTOR HAS OCCURRED OR MAY OCCUR, THEY SHALL PROMPTLY CONTACT THE COOPERATIVE'S COMPLIANCE OFFICER, WHO IS THE GENERAL COUNSEL FOR THE COOPERATIVE. INDIVIDUALS WHO FAIL TO COMPLY WITH THE INTENT OF THIS POLICY MAY BE SUBJECT TO DISCIPLINARY ACTION, UP TO AND INCLUDING TERMINATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CEO'S COMPENSATION IS APPROVED BY THE BOARD OF DIRECTORS. COMPARABLE COMPENSATION DATA FROM THE MARKET AND THE INDUSTRY IS USED IN SETTING THE COMPENSATION. INDUSTRY TRADE ORGANIZATIONS ASSIST IN THE PROCESS. OTHER OFFICERS AND KEY EMPLOYEE COMPENSATION ARE SET THROUGH ANNUAL PERFORMANCE EVALUATION AND COMPARISON TO INDUSTRY WAGE AND BENEFIT STANDARDS. THE CEO SETS THE COMPENSATION AMOUNT.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND THE FINANCIAL STATEMENTS ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE OVERSIGHT AND SELECTION PROCESS FOR THE AUDIT OF THE FINANCIAL STATEMENTS DID NOT CHANGE FROM THE PRIOR YEAR.</ExplanationTxt>
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          <BusinessNameLine1Txt>SOUTHERN FUEL SUPPLY LLC</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>11543 LAKE OF EGYPT ROAD</AddressLine1Txt>
          <CityNm>MARION</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
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      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
