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            <CityNm>Winston</CityNm>
            <StateAbbreviationCd>OR</StateAbbreviationCd>
            <ZIPCd>97496</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Right-of-way clearin</ServicesDesc>
        <CompensationAmt>961305</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Cascade Construction</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
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            <CityNm>Winston</CityNm>
            <StateAbbreviationCd>OR</StateAbbreviationCd>
            <ZIPCd>97496</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Power pole testing</ServicesDesc>
        <CompensationAmt>119450</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Trice Underground Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 370</AddressLine1Txt>
            <CityNm>Lakeside</CityNm>
            <StateAbbreviationCd>OR</StateAbbreviationCd>
            <ZIPCd>97449</ZIPCd>
          </USAddress>
        </ContractorAddress>
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        <CompensationAmt>118877</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>6</CntrctRcvdGreaterThan100KCnt>
      <TotalContributionsAmt>0</TotalContributionsAmt>
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        <BusinessCd>221000</BusinessCd>
        <TotalRevenueColumnAmt>35202511</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>35202511</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
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        <TotalRevenueColumnAmt>212464</TotalRevenueColumnAmt>
        <ExclusionAmt>212464</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>35414975</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>490418</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>359979</RelatedOrExemptFuncIncomeAmt>
        <ExclusionAmt>130439</ExclusionAmt>
      </InvestmentIncomeGrp>
      <IncmFromInvestBondProceedsGrp>
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      </IncmFromInvestBondProceedsGrp>
      <RoyaltiesRevenueGrp>
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      </RoyaltiesRevenueGrp>
      <GrossRentsGrp>
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      </GrossRentsGrp>
      <RentalIncomeOrLossGrp>
        <PersonalAmt>1336</PersonalAmt>
      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>1336</TotalRevenueColumnAmt>
        <ExclusionAmt>1336</ExclusionAmt>
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      <GrossAmountSalesAssetsGrp>
        <OtherAmt>21500</OtherAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <OtherAmt>28190</OtherAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>-6690</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>-6690</RelatedOrExemptFuncIncomeAmt>
      </NetGainOrLossInvestmentsGrp>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </NetIncmFromFundraisingEvtGrp>
      <NetIncomeFromGamingGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </NetIncomeFromGamingGrp>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>36579</UnrelatedBusinessRevenueAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>36579</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>35555800</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>36579</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>344239</ExclusionAmt>
      </TotalRevenueGrp>
      <GrantsToDomesticOrgsGrp>
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      </GrantsToDomesticOrgsGrp>
      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>0</TotalAmt>
      </GrantsToDomesticIndividualsGrp>
      <ForeignGrantsGrp>
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      </ForeignGrantsGrp>
      <BenefitsToMembersGrp>
        <TotalAmt>2568397</TotalAmt>
      </BenefitsToMembersGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>1210143</TotalAmt>
      </CompCurrentOfcrDirectorsGrp>
      <CompDisqualPersonsGrp>
        <TotalAmt>0</TotalAmt>
      </CompDisqualPersonsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>2944276</TotalAmt>
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      <PensionPlanContributionsGrp>
        <TotalAmt>660990</TotalAmt>
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      <OtherEmployeeBenefitsGrp>
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      <PayrollTaxesGrp>
        <TotalAmt>225237</TotalAmt>
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      <FeesForServicesManagementGrp>
        <TotalAmt>0</TotalAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>38886</TotalAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>16250</TotalAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesLobbyingGrp>
        <TotalAmt>0</TotalAmt>
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      <FeesForServicesProfFundraising>
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      <FeesForSrvcInvstMgmntFeesGrp>
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      <FeesForServicesOtherGrp>
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      <AdvertisingGrp>
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      <OfficeExpensesGrp>
        <TotalAmt>54461</TotalAmt>
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      <InformationTechnologyGrp>
        <TotalAmt>512366</TotalAmt>
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      <RoyaltiesGrp>
        <TotalAmt>0</TotalAmt>
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      <OccupancyGrp>
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      <TravelGrp>
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      <PymtTravelEntrtnmntPubOfclGrp>
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      <ConferencesMeetingsGrp>
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      <InterestGrp>
        <TotalAmt>2289570</TotalAmt>
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      <PaymentsToAffiliatesGrp>
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      <DepreciationDepletionGrp>
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      <InsuranceGrp>
        <TotalAmt>260809</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Purchased power</Desc>
        <TotalAmt>12848349</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Distribution - O&amp;M</Desc>
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      <OtherExpensesGrp>
        <Desc>Taxes</Desc>
        <TotalAmt>974726</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Admin &amp; General</Desc>
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        <TotalAmt>508046</TotalAmt>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <CashNonInterestBearingGrp>
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        <EOYAmt>706946</EOYAmt>
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      <SavingsAndTempCashInvstGrp>
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        <EOYAmt>4893656</EOYAmt>
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      <PledgesAndGrantsReceivableGrp>
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      <AccountsReceivableGrp>
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      <OthNotesLoansReceivableNetGrp>
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      <InventoriesForSaleOrUseGrp>
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        <EOYAmt>86928567</EOYAmt>
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      <InvestmentsPubTradedSecGrp>
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      <InvestmentsOtherSecuritiesGrp>
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        <EOYAmt>5790017</EOYAmt>
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      <IntangibleAssetsGrp>
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        <EOYAmt>2577365</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>108010862</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>43455587</EOYAmt>
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      <OtherLiabilitiesGrp>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>53534999</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrgDoesNotFollowSFAS117Ind>X</OrgDoesNotFollowSFAS117Ind>
      <CapStkTrPrinCurrentFundsGrp>
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      <PdInCapSrplsLandBldgEqpFundGrp>
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        <EOYAmt>51457696</EOYAmt>
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        <EOYAmt>2947187</EOYAmt>
      </RtnEarnEndowmentIncmOthFndsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>52780767</BOYAmt>
        <EOYAmt>54475863</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>106006223</BOYAmt>
        <EOYAmt>108010862</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>0</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>1695096</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
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        <DepreciationAmt>2828774</DepreciationAmt>
        <BookValueAmt>2712560</BookValueAmt>
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      <EquipmentGrp>
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      <TotalBookValueProgramRltdAmt>5790017</TotalBookValueProgramRltdAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Consumer deposits</Desc>
        <Amt>1200093</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>Deferred credits</Desc>
        <Amt>1024410</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>Postretirement benefit obligation</Desc>
        <Amt>1583600</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>3808103</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueSubtotalAmt>35936618</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>35936618</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>33368221</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>33368221</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>2568397</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>2568397</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>35936618</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>The Cooperative is generally exempt from federal income tax under Section 501(c)(12) of the Internal Revenue Code. An exemption from the State of Oregon corporation excise tax is provided by Oregon Revised Statutes 317.080. However, the Cooperative is subject to Federal and Oregon unrelated business income tax. The Cooperative had unrelated business income totaling $43,468 and $2,520 during 2017 and 2016, respectively.The Cooperative has adopted ASC Topic 740-10, Income Taxes, relating to accounting for uncertain tax positions. The Cooperative has not identified any uncertain income tax positions that would jeopardize its tax-exempt status. The Cooperative's income tax returns are subject to review and examination by federal authorities. With few exceptions, the tax returns essentially remain open for possible examination for a period of three years after the respective filing deadlines of those returns.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 4b: Other revenue amounts included on 990 but not included in F/S</FormAndLineReferenceDesc>
        <ExplanationTxt>Patronage capital to be allocated $2568397</ExplanationTxt>
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    </IRS990ScheduleD>
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      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
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        <PersonNm>Daniel Springer</PersonNm>
        <TitleTxt>CIO</TitleTxt>
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        <TotalCompensationFilingOrgAmt>179698</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Donald J Alexander</PersonNm>
        <TitleTxt>Journeyman Lineman</TitleTxt>
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        <TotalCompensationFilingOrgAmt>186800</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Frank Corrales Jr</PersonNm>
        <TitleTxt>CFO</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Jacob Knudsen</PersonNm>
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        <DeferredCompensationFlngOrgAmt>42276</DeferredCompensationFlngOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Matthew Mjelde</PersonNm>
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        <PersonNm>Randy McDonald</PersonNm>
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        <PersonNm>Roger Meader</PersonNm>
        <TitleTxt>CEO/General Mgr</TitleTxt>
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        <OtherCompensationFilingOrgAmt>9619</OtherCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Tim Hawkins</PersonNm>
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        <OtherCompensationFilingOrgAmt>1422</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>85341</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>21665</NontaxableBenefitsFilingOrgAmt>
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        <RelationshipDescriptionTxt>Wife of CEO</RelationshipDescriptionTxt>
        <TransactionAmt>115068</TransactionAmt>
        <TransactionDesc>Wages &amp; benefits</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Roger Meader</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>PNGC Director</RelationshipDescriptionTxt>
        <TransactionAmt>13296541</TransactionAmt>
        <TransactionDesc>Purchased power-PNGC</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Mitch McDonald</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>Son of Oper Mgr</RelationshipDescriptionTxt>
        <TransactionAmt>143412</TransactionAmt>
        <TransactionDesc>Wages &amp; benefits</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="17005038" softwareVersionNum="2017v2.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6: Explanation of Classes of Members or Shareholder</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization is a Cooperative formed to provide electric service to its members. The members elect the governing body and approve changes in the by-laws. Members receive a share of the Cooperatives margins through the approval of retirement of patronage dividends.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a: How Members or Shareholders Elect Governing Body</FormAndLineReferenceDesc>
        <ExplanationTxt>There is one class of membership for all members. A member is entitled to one vote to elect directors and to make changes to the Cooperatives by-laws.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors reviews the Form 990 prior to submission.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors and employees undersign to the fact that they have received, read and understand the conflict of interest policy. The policy is reviewed annually by the Board members and supervisors review the policy with employees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b: Compensation Review and Approval Process for Officers and Key Employees</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors evaluate the CEO's performance. An independent compensation consultant is obtained every third year to assist the Board in determining the CEO's compensation package. Supervisors of other key employees (all employees) set annual goals and assess each employee's performance on a daily basis. The methodology of developing a wage scale range for job positions within the organization is approved by the Board of Directors using an established compensation policy. All changes to compensation of key employees (all employees) must be approved in writing by the CEO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>Items that legally must be provided are done so upon request. The year end audited financial information is published in the annual membership meeting bulletin.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Decreases</FormAndLineReferenceDesc>
        <ExplanationTxt>Capital credit retirement = -$1910959</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Decreases</FormAndLineReferenceDesc>
        <ExplanationTxt>Decrease in memberships = -$235</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Discount on early retirement of cap credits = $65980</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Increase in memberships = $0</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Other comprehensive income = $378300</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Patronage capital to be allocated = $2568397</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other Changes In Net Assets Or Fund Balances - Other Increases</FormAndLineReferenceDesc>
        <ExplanationTxt>Unclaimed patronage capital activity = $593613</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 4 - Explanation of Benefits Paid to Members</FormAndLineReferenceDesc>
        <ExplanationTxt>The IRS instructions clarify that patronage dividends paid by 501(c)(12) organizations should be reported in the statement of functional expenses on line 4. The Cooperative has allocated 100% of its current year margins as patronage dividends to its members and reported this amount on line 4. The Cooperative's accounting system follows generally accepted accounting principles (GAAP) which do not report patronage dividends as an expense; as such, the current year margins are also recorded as a reconciling item on Schedule D Part XIII of the Form 990.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>