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      <Form990PartVIISectionAGrp>
        <PersonNm>TOM MURRAY</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MATT NEWSOM</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRYAN NUDELBACHER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GAURAV PARIKH</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CLARKE PAULEY</PersonNm>
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        <PersonNm>BRAD PETERSEN</PersonNm>
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        <PersonNm>MARK STOERMANN</PersonNm>
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        <PersonNm>KEVIN STRUVE</PersonNm>
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        <PersonNm>LAUREN TURNER</PersonNm>
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        <PersonNm>MAX VERNIER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SEAN WINE</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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            <AddressLine1Txt>1126 I ST SE</AddressLine1Txt>
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      <ContractorCompensationGrp>
        <ContractorName>
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            <BusinessNameLine1Txt>SHERATON GRAND HOTEL</BusinessNameLine1Txt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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            <StateAbbreviationCd>DC</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>ECOENGINEERS</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>909 LOCUST ST SUITE 202</AddressLine1Txt>
            <CityNm>DES MOINES</CityNm>
            <StateAbbreviationCd>IA</StateAbbreviationCd>
            <ZIPCd>50309</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>RESEARCH &amp; DEVELOPMENT</ServicesDesc>
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      <CntrctRcvdGreaterThan100KCnt>4</CntrctRcvdGreaterThan100KCnt>
      <ProgramServiceRevenueGrp>
        <Desc>ANNUAL CONFERENCE</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>2108385</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2108385</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP DUES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>1743746</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1743746</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>TRAINING</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>117425</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>117425</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>WEBINARS &amp; WORKSHOPS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>9000</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>9000</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>3978556</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>35156</TotalRevenueColumnAmt>
        <ExclusionAmt>35156</ExclusionAmt>
      </InvestmentIncomeGrp>
      <OtherRevenueMiscGrp>
        <Desc>ADVERTISING</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>155987</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>155987</UnrelatedBusinessRevenueAmt>
      </OtherRevenueMiscGrp>
      <MiscellaneousRevenueGrp>
        <TotalRevenueColumnAmt>8271</TotalRevenueColumnAmt>
        <ExclusionAmt>8271</ExclusionAmt>
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      <TotalRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>3978556</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>155987</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>43427</ExclusionAmt>
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      <FeesForServicesManagementGrp>
        <TotalAmt>1086109</TotalAmt>
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      <AdvertisingGrp>
        <TotalAmt>19410</TotalAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>70976</TotalAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>74875</TotalAmt>
      </InformationTechnologyGrp>
      <TravelGrp>
        <TotalAmt>115744</TotalAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>1515786</TotalAmt>
      </ConferencesMeetingsGrp>
      <InsuranceGrp>
        <TotalAmt>2545</TotalAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>FUNDED PROJECTS</Desc>
        <TotalAmt>208330</TotalAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>DUES &amp; SUBSCRIPTIONS</Desc>
        <TotalAmt>72981</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>TRAINING</Desc>
        <TotalAmt>49285</TotalAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>CODES &amp; STANDARDS</Desc>
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      <AllOtherExpensesGrp>
        <TotalAmt>11213</TotalAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>3910551</TotalAmt>
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      <CashNonInterestBearingGrp>
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        <EOYAmt>488398</EOYAmt>
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      <SavingsAndTempCashInvstGrp>
        <EOYAmt>1957285</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>1323887</BOYAmt>
      </PledgesAndGrantsReceivableGrp>
      <AccountsReceivableGrp>
        <EOYAmt>7275</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>85223</BOYAmt>
        <EOYAmt>67725</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>2520683</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>58266</BOYAmt>
        <EOYAmt>120451</EOYAmt>
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      <DeferredRevenueGrp>
        <BOYAmt>2126743</BOYAmt>
        <EOYAmt>1385483</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>2185009</BOYAmt>
        <EOYAmt>1505934</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>747330</BOYAmt>
        <EOYAmt>1014749</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>747330</BOYAmt>
        <EOYAmt>1014749</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>2932339</BOYAmt>
        <EOYAmt>2520683</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>267419</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>0</FSAuditedInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleC documentId="RetDoc1039700001">
      <SubstantiallyAllDuesNondedInd>0</SubstantiallyAllDuesNondedInd>
      <OnlyInHouseLobbyingInd>0</OnlyInHouseLobbyingInd>
      <AgreeCarryoverPriorYearInd>1</AgreeCarryoverPriorYearInd>
      <DuesAssessmentsAmt>1743746</DuesAssessmentsAmt>
      <NonDeductibleLbbyngPltclCYAmt>526634</NonDeductibleLbbyngPltclCYAmt>
      <NonDedLbbyngPltclCyovAmt>7223</NonDedLbbyngPltclCyovAmt>
      <NonDeductibleLbbyngPltclTotAmt>533857</NonDeductibleLbbyngPltclTotAmt>
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      <CarriedOverAmt>-76454</CarriedOverAmt>
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    <IRS990ScheduleL documentId="RetDoc1042800001">
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>SMART POLICY GROUP</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>BOARD MEMBER</RelationshipDescriptionTxt>
        <TransactionAmt>541487</TransactionAmt>
        <TransactionDesc>LOBBYING SERVICES</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
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      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>STONE HARBOR GROUP</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>EXECUTIVE DIRECTOR</RelationshipDescriptionTxt>
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        <TransactionDesc>MANAGEMENT SERVICES</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AMERICAN BIOGAS COUNCIL CONTRACTS WITH STONE HARBOR GROUP FOR MANAGEMENT SERVICES TO THE ORGANIZATION. IN THE CALENDAR YEAR ENDED DECEMBER 31, 2023, THE COUNCIL PAID STONE HARBOR GROUP $1,060,993 FOR MANAGEMENT SERVICES. PATRICK SERFASS, PRESIDENT OF STONE HARBOR GROUP, SERVED AS EXECUTIVE DIRECTOR OF THE COUNCIL. THE MANAGEMENT FEE ATTRIBUTABLE TO SERVICES PROVIDED BY MR. SERFASS FOR THE YEAR WAS $98,299.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COUNCIL'S BOARD UNANIMOUSLY APPROVED AN AMENDMENT TO THE BYLAWS IN NOVEMBER 2023 TO ADD A POSITION TO THE EXECUTIVE COMMITTEE. ADDITIONALLY, THE BOARD TOOK THE OPPORTUNITY TO ADDRESS SOME GENERAL REDUNDANCIES IN THE BYLAWS TO CONDENSE THE DOCUMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ABC IS A MEMBER-BASED ASSOCIATION OF 405 MEMBERS AS OF THE FILING OF THIS FORM 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>PER THE COUNCIL BYLAWS ARTICLE IV, SECTION 4.1A: AN ANNUAL MEMBERSHIP MEETING SHALL BE HELD EACH YEAR AT A TIME AND PLACE SET BY THE BOARD, AT WHICH MEMBERS SHALL RECEIVE THE ANNUAL REPORTS OF THE DIRECTORS, OFFICERS, AND COMMITTEES, INCLUDING THE FINANCIAL REPORT, ELECT DIRECTORS IN ACCORDANCE WITH ARTICLE IV, SECTION 4.1A, AND TRANSACT SUCH OTHER BUSINESS AS MAY GERMANE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COUNCIL'S FINANCIAL STAFF, THE MANAGEMENT COMPANY, AND EXECUTIVE DIRECTOR REVIEW FORM 990 FOR COMPLETENESS AND ACCURACY BEFORE IT IS PROVIDED TO THE TREASURER FOR FINAL REVIEW AND APPROVAL FOR FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS AVAILABLE TO THE ORGANIZATION'S MEMBERS UPON REQUEST; HOWEVER, THESE DOCUMENTS ARE NOT MADE AVAILABLE TO THE PUBLIC.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>