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            <StateAbbreviationCd>MN</StateAbbreviationCd>
            <ZIPCd>56265</ZIPCd>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
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            <BusinessNameLine1Txt>SUMMIT UTILITY SERVICES LLC</BusinessNameLine1Txt>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
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            <CityNm>GLASGO</CityNm>
            <StateAbbreviationCd>MT</StateAbbreviationCd>
            <ZIPCd>59230</ZIPCd>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
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            <BusinessNameLine1Txt>ASPLUNDH TREE EXPERT CO</BusinessNameLine1Txt>
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      <OtherRevenueMiscGrp>
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        <Desc>COST OF POWER</Desc>
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        <Desc>ADMIN &amp; GENERAL EXPENSE</Desc>
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      <OtherExpensesGrp>
        <Desc>DIST EXP - MAINTENANCE</Desc>
        <TotalAmt>2515971</TotalAmt>
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      <AllOtherExpensesGrp>
        <TotalAmt>3305617</TotalAmt>
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      <TotalFunctionalExpensesGrp>
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        <EOYAmt>1236</EOYAmt>
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      <PdInCapSrplsLandBldgEqpFundGrp>
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        <EOYAmt>0</EOYAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
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      <FSAuditedBasisGrp>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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      <FootnoteTextInd>X</FootnoteTextInd>
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        <ExplanationTxt>CUSTOMERS HAVE THE OPTION OF PARTICIPATING IN OPERATION ROUND-UP. PARTICIPATING CUSTOMERS ROUND THEIR BILLS UP TO THE NEAREST DOLLAR AND THE DIFFERENCE IS CONTRIBUTED TO THE SIOUX VALLEY ENERGY CUSTOMERS' TRUST, WITH THE FUNDS BEING UTILIZED FOR CHARITABLE GIVING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COOPERATIVE HAS BEEN GRANTED TAX EXEMPT STATUS UNDER SECTION 501(C)(12) OF THE INTERNAL REVENUE CODE. USI IS ORGANIZED AS AN LLC AND IS TREATED AS A DISREGARDED ENTITY FOR INCOME TAX PURPOSES. INCOME FROM THE LLC IS INCLUDED WITH THE COOPERATIVE'S UNRELATED BUSINESS INCOME FOR TAX REPORTING PURPOSES. THE COOPERATIVE EVALUATED ITS TAX POSITIONS AND DETERMINED THAT IT HAS NO UNCERTAIN TAX POSITIONS AS OF DECEMBER 31, 2017 AND 2016.</ExplanationTxt>
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        <DeferredCompensationFlngOrgAmt>60730</DeferredCompensationFlngOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHELE NIELSON</PersonNm>
        <TitleTxt>MANAGER OF ENGINEERING</TitleTxt>
        <BaseCompensationFilingOrgAmt>107558</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>26823</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>27742</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>162123</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COOPERATIVE OCCASIONALLY PROVIDES CHARTER TRAVEL FOR GROUPS OF ITS DIRECTORS, OFFICERS, AND EMPLOYEES TO ATTEND MEETINGS OF OTHER ORGANIZATIONS WHEN THIS IS MORE COST EFFECTIVE AND EXPEDIENT THAN ARRANGING FOR OTHER COMMERCIALLY AVAILABLE TRAVEL METHODS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH ELECTRIC ACCOUNT IS A MEMBER.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>COOPERATIVE IS BROKEN INTO 10 DISTRICTS. 9 DISTRICTS HAVE ONE DIRECTOR. 1 DISTRICT HAS TWO DIRECTORS. MEMBERS CAN VOTE FOR THE DIRECTOR FROM THE DISTRICT IN WHICH THE MEMBER IS LOCATED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGES TO THE COOPERATIVE BY-LAWS ARE VOTED ON AT THE ANNUAL MEETING IN WHICH EACH MEMBER HAS THE RIGHT TO VOTE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 WILL BE PROVIDED TO ALL MEMBERS OF THE BOARD OF DIRECTORS AT A MEETING PRIOR TO THE FILING. EACH BOARD MEMBER WILL HAVE THE OPPORTUNITY TO REVIEW THE RETURN AT THAT TIME. THE RETURN WILL ALSO BE REVIEWED IN DETAIL BY THE DIRECTOR OF FINANCE AND ACCOUNTING PRIOR TO FILING OF THE RETURN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL EMPLOYEES, DIRECTORS, THE GENERAL MANAGER/CEO, THE MANAGEMENT STAFF, AND THE ATTORNEY MUST BE FAMILIAR WITH THE CONFLICT OF INTEREST POLICY. EACH IS REQUIRED TO EXECUTE A CONFLICT OF INTERST STATEMENT THAT THEY ARE IN COMPLIANCE WITH THE POLICY. ANNUALLY THE DIRECTORS, GENERAL MANAGER/CEO, ATTORNEY AND MANAGEMENT STAFF EXECUTE A NEW STATEMENT. EMPLOYEES EXECUTE ONE AT A TIME OF EMPLOYMENT AND UPDATE WHEN A CONFLICT ARISES. IF A CONFLICT OF INTEREST EXISTS, THEN THE EMPLOYEE AND SUPERVISOR IN COORDINATION WITH MANAGEMENT SHALL COLLECTIVELY DETERMINE WHAT ACTION SHOULD BE TAKEN. IF A DIRECTOR HAS A CONFLICT OF INTEREST HE/SHE SHALL DISQUALIFY THEMSELVES FROM DECISIONS THAT POSE THE CONFLICT OR THE APPEARANCE OF A CONFLICT OF INTEREST. THE DIRECTOR MAY REQUEST AN OPINION OF THE COOPERATIVE ATTORNEY BEFORE SUCH ACTION IS TAKEN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>SIOUX VALLEY ENERGY USES A NATIONAL COMPENSATION SURVEY PROVIDED TO US BY OUR NATIONAL ASSOCIATION, NRECA. THE NATIONAL AVERAGE PAY IS USED AS A GUIDANCE FOR ESTABLISHING INITIAL SALARIES AND YEARLY SALARY CHANGES. YEARS OF EXPERIENCE IN A POSITION ARE ALSO FACTORED IN. USING THE SURVEY DATA HELPS TO ESURE SALARIES REMAIN COMPETITIVE WITH THOSE OFFERED AT OTHER RURAL ELECTRIC COOPERATIVES AND THAT THE DATA REMAINS CONSISTENT FROM YEAR TO YEAR. THIS PROCESS IS USED FOR ALL POSITIONS AT SIOUX VALLEY ENERGY ON AN ANNUAL BASIS. THE LAST YEAR THIS PROCESS WAS UNDERTAKEN WAS 2017.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COOPERATIVE MAKES ITS GOVERNING DOCUMMENTS AND FINACIAL STATEMENTS AVAILABLE TO THE COOPERATIVE MEMBERS UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>CORSON DEVELOPMENT ASSOCIATION, LLP K-1 -4,616. RETIREMENT OF CAPITAL CREDITS -1,633,753. PATRONAGE DIVIDENDS PAID 4,629,947.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 23</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE IRS INSTRUCTIONS STATE THAT PATRONAGE DIVIDENDS PAID BY SECTION 501(C)(12) ORGANIZATIONS TO THEIR MEMBERS SHOULD BE REPORTED ON LINE 4. THE ORGANIZATION HAS INTERPRETED PATRONAGE DIVIDENDS PAID TO MEAN PATRONAGE DIVIDENDS ALLOCATED OR TO BE ALLOCATED FOR THE CURRENT YEAR. SINCE THIS ALLOCATION IS NOT AN EXPENSE UNDER GENERALLY ACCEPTED ACCOUNTING PRINCIPLES (GAAP), THIS HAS RESULTED IN A RECONCILING ITEM TO NET ASSETS IN PART XI, ON PAGE 12 OF THE FORM 990.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>UTILITY SAFETY INNOVATIONS LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>PO BOX 47092 SC HWY 34</AddressLine1Txt>
          <CityNm>COLMAN</CityNm>
          <StateAbbreviationCd>SD</StateAbbreviationCd>
          <ZIPCd>57017</ZIPCd>
        </USAddress>
        <PrimaryActivitiesTxt>DESIGN UTILITY SAFETY PRODUCTS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>SD</LegalDomicileStateCd>
        <TotalIncomeAmt>-2921</TotalIncomeAmt>
        <EndOfYearAssetsAmt>0</EndOfYearAssetsAmt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>SIOUX VALLEY SOUTHWESTERN ELECTRIC INC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
      </IdDisregardedEntitiesGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>