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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE D, FIN 48 FOOTNOTE: THE VEBA TRUST RECEIVED AN EXEMPTION LETTER FROM THE IRS DATED JANUARY 19, 2006 STATING THAT THE TRUST IS TAX-EXEMPT UNDER THE PROVISIONS OF SECTION 501(C)(9) OF THE IRC. ACCORDINGLY, THE TRUST'S EXEMPT FUNCTION INCOME IS EXEMPT FROM INCOME TAXES. IN ADDITION, ANY NET INVESTMENT INCOME THAT IS PROPERLY SET-ASIDE UNDER IRC 512(A)(3)(B) FOR THE PAYMENT OF LIFE, HEALTH, OR ACCIDENT INSURANCE, OR OTHER BENEFITS OR REASONABLE ADMINISTRATION COSTS IS ALSO EXEMPT. THE 401(H) ACCOUNTS OPERATE UNDER THE SEPARATE DETERMINATION LETTERS RECEIVED BY THE RETIREMENT PLANS DATED APRIL 18, 2017 (MADISON GAS AND ELECTRIC RETIREMENT PLAN) AND JANUARY 24, 2017 (MADISON GAS AND ELECTRIC COMPANY RETIREMENT PLAN FOR BARGAINING EMPLOYEES). THE PLAN SPONSOR BELIEVES THAT THE PLAN AND RELATED VEBA AND 401(H) TRUSTS ESTABLISHED UNDER THE PLAN CONTINUE TO QUALIFY AND OPERATE IN ACCORDANCE WITH APPLICABLE PROVISIONS OF THE IRC. ACCOUNTING PRINCIPLES GENERALLY ACCEPTED IN THE UNITED STATES OF AMERICA REQUIRE PLAN MANAGEMENT TO EVALUATE TAX POSITIONS TAKEN BY THE PLAN AND RECOGNIZE A TAX LIABILITY IF THE PLAN HAS TAKEN AN UNCERTAIN POSITION THAT MORE LIKELY THAN NOT WOULD NOT BE SUSTAINED UPON EXAMINATION BY THE IRS. THE PLAN ADMINISTRATOR HAS ANALYZED THE TAX POSITIONS TAKEN BY THE PLAN AND HAS CONCLUDED THERE WERE NO UNCERTAIN POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION OF A LIABILITY OR DISCLOSURE IN THE ACCOMPANYING FINANCIAL STATEMENTS. THE PLAN IS SUBJECT TO ROUTINE AUDITS BY TAXING JURISDICTIONS; HOWEVER, THERE ARE CURRENTLY NO AUDITS FOR ANY TAX PERIODS IN PROGRESS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>VISION CARE CONTR PAID BY MG&amp;E 54,784. HEALTH INSURANCE PREMIUMS PAID BY PLAN SPONSOR 11,616,238. HEALTH INSURANCE PREMIUMS PAID BY EMPLOYEE CONTRIBUTIONS 2,943,984. NET INCREASE IN 401(H) ACCOUNT -605,785.</ExplanationTxt>
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        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>INVESTMENT INCOME ON LIFE INSURANCE VEBA ASSETS 56,970.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>HEALTH INSURANCE PREMIUMS PAID BY PLAN SPONSOR 11,984,444. HEALTH INSURANCE PREMIUMS PAID BY EMPLOYEE CONTRIBUTIONS 2,943,984.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>MANAGEMENT OF OPERATIONS IS HANDLED BY MADISON GAS &amp; ELECTRIC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8A</FormAndLineReferenceDesc>
        <ExplanationTxt>NO MEETINGS WERE HELD.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8B</FormAndLineReferenceDesc>
        <ExplanationTxt>NO MEETINGS WERE HELD.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE DIRECTOR TOTAL REWARDS FOR MADISON GAS AND ELECTRIC COMPANY PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS NO INDIVIDUAL EMPLOYEES OR OFFICERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>PUBLIC INSPECTION COPIES OF THE FORM 990, GOVERNING DOCUMENTS, AND FINANCIAL STATEMENTS ARE AVAILABLE BY REQUEST AT THE ORGANIZATION'S OFFICES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043500001">
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>MADISON GAS &amp; ELECTRIC COMPANY</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>PO BOX 1231</AddressLine1Txt>
          <CityNm>MADISON</CityNm>
          <StateAbbreviationCd>WI</StateAbbreviationCd>
          <ZIPCd>53701</ZIPCd>
        </USAddress>
        <EIN>390444025</EIN>
        <PrimaryActivitiesTxt>PUBLIC UTILITY</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>WI</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <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>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>1</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
