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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>19644</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>953214</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>37056</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>139722</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>9</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Digital 1 Group LLC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>112 Emerald Star Lane</AddressLine1Txt>
            <CityNm>Lafayette</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>70506</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Marketing</ServicesDesc>
        <CompensationAmt>608542</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Ocean Solutions</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>20130 Lakeview Center Plz Suite 120</AddressLine1Txt>
            <CityNm>Ashburn</CityNm>
            <StateAbbreviationCd>VA</StateAbbreviationCd>
            <ZIPCd>20147</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Technology</ServicesDesc>
        <CompensationAmt>233804</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Wide Eye Creative LLC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1913 12th St Unit B</AddressLine1Txt>
            <CityNm>Washington</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20009</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Marketing</ServicesDesc>
        <CompensationAmt>186250</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Access Accounting Services</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
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            <StateAbbreviationCd>VA</StateAbbreviationCd>
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          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Accounting Services</ServicesDesc>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>KEYES &amp; FOX LLP</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1580 Lincoln Street Suite 1105</AddressLine1Txt>
            <CityNm>Denver</CityNm>
            <StateAbbreviationCd>CO</StateAbbreviationCd>
            <ZIPCd>80203</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Legal</ServicesDesc>
        <CompensationAmt>150606</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>10</CntrctRcvdGreaterThan100KCnt>
      <GovernmentGrantsAmt>1246631</GovernmentGrantsAmt>
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      <TotalContributionsAmt>13035095</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Service Fees</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>501650</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>Government Contracts</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>63460</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>63460</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>565110</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>82313</TotalRevenueColumnAmt>
        <ExclusionAmt>82313</ExclusionAmt>
      </InvestmentIncomeGrp>
      <GrossRentsGrp>
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      </GrossRentsGrp>
      <LessRentalExpensesGrp>
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      </LessRentalExpensesGrp>
      <RentalIncomeOrLossGrp>
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      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
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        <ExclusionAmt>12500</ExclusionAmt>
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        <Desc>Other Income</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>29479</ExclusionAmt>
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      <OtherRevenueTotalAmt>29479</OtherRevenueTotalAmt>
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        <ExclusionAmt>124292</ExclusionAmt>
      </TotalRevenueGrp>
      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>414810</ProgramServicesAmt>
        <FundraisingAmt>32003</FundraisingAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>224726</TotalAmt>
        <ProgramServicesAmt>224251</ProgramServicesAmt>
        <ManagementAndGeneralAmt>475</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>169343</TotalAmt>
        <ManagementAndGeneralAmt>169343</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>1043717</TotalAmt>
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        <ManagementAndGeneralAmt>198307</ManagementAndGeneralAmt>
        <FundraisingAmt>5063</FundraisingAmt>
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      <AdvertisingGrp>
        <TotalAmt>660732</TotalAmt>
        <ProgramServicesAmt>657281</ProgramServicesAmt>
        <ManagementAndGeneralAmt>750</ManagementAndGeneralAmt>
        <FundraisingAmt>2701</FundraisingAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
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        <ProgramServicesAmt>130363</ProgramServicesAmt>
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        <FundraisingAmt>19720</FundraisingAmt>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>675375</ProgramServicesAmt>
        <FundraisingAmt>6441</FundraisingAmt>
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      <OccupancyGrp>
        <TotalAmt>134526</TotalAmt>
        <ProgramServicesAmt>113528</ProgramServicesAmt>
        <ManagementAndGeneralAmt>13060</ManagementAndGeneralAmt>
        <FundraisingAmt>7938</FundraisingAmt>
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      <TravelGrp>
        <TotalAmt>300594</TotalAmt>
        <ProgramServicesAmt>289292</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5577</ManagementAndGeneralAmt>
        <FundraisingAmt>5725</FundraisingAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>132265</ProgramServicesAmt>
        <ManagementAndGeneralAmt>35864</ManagementAndGeneralAmt>
        <FundraisingAmt>1891</FundraisingAmt>
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        <ProgramServicesAmt>52672</ProgramServicesAmt>
        <FundraisingAmt>4054</FundraisingAmt>
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      <InsuranceGrp>
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        <ManagementAndGeneralAmt>28707</ManagementAndGeneralAmt>
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        <Desc>LMI Project Expenses</Desc>
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        <ProgramServicesAmt>813415</ProgramServicesAmt>
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      <TotalFunctionalExpensesGrp>
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      <AccountsReceivableGrp>
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      <PrepaidExpensesDefrdChargesGrp>
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      <TotalAssetsGrp>
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      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>4010347</BOYAmt>
        <EOYAmt>5969784</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
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        <EOYAmt>10167545</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>11729791</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>2255848</ReconcilationRevenueExpnssAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
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        <CurrentTaxYearMinus3YearsAmt>8425217</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>5185184</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>8686485</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>13035095</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>13035095</CurrentTaxYearAmt>
        <TotalAmt>39093181</TotalAmt>
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      <SubstantialContributorsTotAmt>9877032</SubstantialContributorsTotAmt>
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        <CurrentTaxYearMinus1YearAmt>21929</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>94813</CurrentTaxYearAmt>
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      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Schedule A, Part II, Line 10, Explanation of Other Income:</FormAndLineReferenceDesc>
        <ExplanationTxt>Other income - 2020 Amount: $ 27,250. 2021 Amount: $ 15,202. 2022 Amount: $ 23,399. 2023 Amount: $ 15,402. 2024 Amount: $ 29,479.</ExplanationTxt>
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        </ContributorBusinessName>
        <ContributorUSAddress>
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          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
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      </TotalGrassrootsLobbyingGrp>
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      <TotalLobbyingExpendGrp>
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      <OtherExemptPurposeExpendGrp>
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      <TotalExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>11468649</FilingOrganizationsTotalAmt>
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      <LobbyingNontaxableAmountGrp>
        <FilingOrganizationsTotalAmt>723432</FilingOrganizationsTotalAmt>
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      <GrassrootsNontaxableGrp>
        <FilingOrganizationsTotalAmt>180858</FilingOrganizationsTotalAmt>
      </GrassrootsNontaxableGrp>
      <TotLbbyngGrassrootMnsNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyngGrassrootMnsNonTxGrp>
      <TotLbbyExpendMnsLbbyngNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyExpendMnsLbbyngNonTxGrp>
      <AvgLobbyingNontaxableAmountGrp>
        <CurrentYearMinus3Amt>388047</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>454297</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>555850</CurrentYearMinus1Amt>
        <CurrentYearAmt>723432</CurrentYearAmt>
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        <CurrentYearMinus1Amt>33967</CurrentYearMinus1Amt>
        <CurrentYearAmt>42790</CurrentYearAmt>
        <TotalAmt>179806</TotalAmt>
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      <AvgGrassrootsNontaxableGrp>
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        <CurrentYearMinus1Amt>138963</CurrentYearMinus1Amt>
        <CurrentYearAmt>180858</CurrentYearAmt>
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      </AvgGrassrootsNontaxableGrp>
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      <AvgGrassrootsLobbyingExpendGrp>
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        <CurrentYearMinus2Amt>22509</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>23089</CurrentYearMinus1Amt>
        <CurrentYearAmt>34708</CurrentYearAmt>
        <TotalAmt>124950</TotalAmt>
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    <IRS990ScheduleD documentId="RetDoc1040000001">
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        <BookValueAmt>70818</BookValueAmt>
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      <OtherLandBuildingsGrp>
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      <TotalBookValueLandBuildingsAmt>158026</TotalBookValueLandBuildingsAmt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>Refundable advance</Desc>
        <Amt>448345</Amt>
      </OtherLiabilitiesOrgGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SUN is exempt from the payment of income taxes on its exempt activities under Section 501(c)(3) of the Internal Revenue Code (IRC). No provision for income taxes has been made, as there were no unrelated business activities for the year ended December 31, 2024. Management has evaluated the Organization's tax positions and concluded that the consolidated financial statements do not include any uncertain tax positions.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Solar Rights Alliance</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>302 Washington Street Suite</AddressLine1Txt>
          <AddressLine2Txt>150-5062</AddressLine2Txt>
          <CityNm>San Diego</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>92103</ZIPCd>
        </USAddress>
        <RecipientEIN>811203907</RecipientEIN>
        <IRCSectionDesc>501(c)(4)</IRCSectionDesc>
        <CashGrantAmt>20000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>Solar industry outreach and relationship building for 2024</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Earth Spark International</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>750 17th St NW</AddressLine1Txt>
          <CityNm>Washington</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20006</ZIPCd>
        </USAddress>
        <RecipientEIN>811941933</RecipientEIN>
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          <BusinessNameLine1Txt>One Roof Community Housing</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <StateAbbreviationCd>MN</StateAbbreviationCd>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kristi Gallagher</PersonNm>
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      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Conflicts of interest are monitored and updated annually. There are no conflict of interests identified in 2024.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation of Officers and Key Employees (Consultants) is based upon review of comparable salaries and fees of other similar size organizations. The process is contemporaneously documented as well.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
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        </DisregardedEntityName>
        <USAddress>
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          <CityNm>Washington</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <EIN>862788934</EIN>
        <PrimaryActivitiesTxt>Promote renewable energy</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
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        </DirectControllingEntityName>
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        </OtherOrganizationName>
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        <MethodOfAmountDeterminationTxt>FMV</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
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</Return>