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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 3, PART X</FormAndLineReferenceDesc>
        <ExplanationTxt>NESCAUM HAS BEEN GRANTED TAX-EXEMPT STATUS UNDER INTERNAL REVENUE CODE SECTION 501(C)3 AND ARE, THEREFOR, GENERALLY EXEMPT FROM FEDERAL AND STATE INCOME TAXES. ACCORDINGLY, NO PROVISION FOR INCOME TAXES HAS BEEN PROVIDED FOR IN THE FINANCIAL STATEMENTS. ASC 740-10, "INCOME TAXES" REQUIRES THE ORGANIZATION TO EVALUATE AND DISCLOSE TAX POSITION THAT COULD HAVE AN EFFECT ON ORGANIZATION'S FINANCIAL STATEMENT. THE ORGANIZATION REPORTS ITS ACTIVITIES TO THE INTERNAL REVENUE SERVICE AND TO THE COMMONWEALTH OF MASSACHUSSETTS ON AN ANNUAL BASIS. THESE INFORMATIONAL RETURNS ARE GENERALLY SUBJECT TO AUDIT AND REVIEW BY THE GOVERNMENTAL AGENCIES FOR A PERIOD OF THREE YEARS AFTER FILING. SUBSTANTIALLY ALL OF THE ORGANIZATION'S INCOME, EXPENDITURES AND ACTIVITIES RELATE TO ITS EXEMPT PURPOSE, THEREFORE, MANAGEMENT HAS DETERMINED THAT THE ORGANIZATION IS NOT SUBJECT TO UNREALATED BUSINESS INCOME TAXES AND WILL CONTINUE TO QUALIFY AS TAX-EXEMPT NOT-FOR-PROFIT ENTITIES.</ExplanationTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LISA RECTOR</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ELAINE O'GRADY</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>NESCAUM, AS A COALITION OF STATE AIR AGENCIES, PROMOTES REGIONAL COOPERATION AND ACTION BY ITS MEMBER STATES IN SUPPORT OF EFFECTIVE PROGRAMS TO REDUCE THE ADVERSE PUBLIC HEALTH AND ENVIRONMENTAL IMPACTS OF AIR POLLUTION AND CLIMATE CHANGE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AMOUNTS ENTERED ON FORM 990, PART IX, COLUMN C REPRESENT NESCAUM'S INDIRECT COSTS. THE NEGATIVE BALANCE REPORTED ON LINE 24E IS A RESULT OF A CHANGE IN THE ESTIMATE OF NESCAUM'S RIGHT-OF-USE ASSET AND LEASE LIABILITY, WHICH WAS NOT INCLUDED AS PART OF THE INDIRECT COSTS. ADDITIONALLY, THE NEGATIVE BALANCE REPORTED ON LINE 16 IS DUE TO SUBLEASE RENTAL INCOME OF 12,055 OFFSETTING THE INDIRECT COST PORTION OF OCCUPANCY.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>BUILDING ELECTRIFICATION INITIATIVE (BEI). NESCAUM LAUNCHED THE BEI IN 2022 TO PROVIDE TECHNICAL AND POLICY SUPPORT TO STATE AIR AND CLIMATE OFFICES INTERESTED IN TACKLING BUILDING EMISSIONS, WITH A FOCUS ON EXISTING BUILDINGS. THE GOAL OF THE INITIATIVE IS TO BUILD STATE CAPACITY THROUGH CONVENING, INFORMATION-SHARING, RESEARCH AND ANALYSIS, AND POLICY DEVELOPMENT. BEI ACTIVITIES INCLUDE: DEVELOPING A MULTISTATE AGREEMENT WITH TARGETS AND ACTIONS TO ADDRESS EMISSIONS FROM THE BUILDING SECTOR; SUPPORTING STATE ADOPTION OF ZERO-EMISSIONS STANDARDS FOR WATER AND SPACE HEATING; SHARING INFORMATION AND FACILITATING COLLABORATION WITH UTILITY COMMISSIONS AND ENERGY OFFICES ON OTHER STATE POLICIES TO ADDRESS BUILDING SECTOR EMISSIONS (E.G., CLEAN HEAT STANDARDS, RATE REFORM); HELPING STATES LEVERAGE FEDERAL FUNDING TO ADDRESS BUILDING SECTOR EMISSIONS AND IDENTIFYING MULTISTATE PROJECTS THAT COULD BENEFIT FROM FEDERAL FUNDING; ENGAGING THE ENVIRONMENTAL JUSTICE (EJ) COMMUNITY ON BEI TOPICS THROUGH AN EJ ADVISORY GROUP; ESTIMATING THE CRITERIA AIR POLLUTANT AND GHG EMISSION BENEFITS OF RESIDENTIAL BUILDING ELECTRIFICATION; AND EVALUATING THE HEALTH BENEFITS OF RESIDENTIAL BUILDING ELECTRIFICATION. THE BEI TASK FORCE STATES INCLUDE: CA, CO, CT, DC, MA, MD, ME, NH, NJ, NY, OR, RI, AND VT. PARTICIPANTS ARE STATE AGENCY STAFF WORKING ON BUILDING DECARBONIZATION, INCLUDING REPRESENTATIVES FROM AIR, CLIMATE, AND ENERGY OFFICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 2, PART III, LINE 4D</FormAndLineReferenceDesc>
        <ExplanationTxt>EPA FY24-29 IND TEST; CAMNET 2008 NETWORK MEMBERSHIP; MA ACIDDEP; CA ZEV; EV AWARENESS; NYSERDA CORDWOOD BOILER; NYSERDA FURNACES; NYSERDA ZEV TASKFORCE; NYSERDA RWH TEST METHODS; IZEVA CLIMATE WORKS; EF EV 22; JMF ZEV4 9/18-9/1; NYSERDA RWH GAP; CAL START (ABT LOCAL); NYSERDA IDC LEAD; NYSERDA TWO -10; TWO-11 RWH TOXICS; NY AGO PM10; VT DEC GHG SUBCONTRACT; CSIS ELECTRIC MOBILITY; NYSERDA RHNY; NYS EPA ACCEPT TEST; QU ZEV TF; NYSERDA AERMOD; NYSERDA LISTOS 22-23; NA SEO,NYSERDA RWH, CO ZEV DPHE &amp; ENERGYOFFICE; USCA IL ZEV; NATL GRID E-HW; NYSERDA REHEAT; PROV RI PORT AIR TOX, CT DEEP CPRG, RI CPRG PLANNING, NH CPRG SUPPORT; CALSTART HILLYS WS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED IN DETAIL BY DEBJANI BRAHMACHARI, DIRECTOR OF FINANCE, THEN GIVEN TO CORALIE COOPER, DEPUTY DIRECTOR, AND PAUL J. MILLER, EXECUTIVE DIRECTOR AND PRESIDENT, FOR REVIEW AND SIGNING. PRIOR TO FILING, THE BOARD OF DIRECTORS ARE NOTIFIED THAT THE FORM 990 IS AVAILABLE TO THEM ON NESCAUM'S MEMBERS ONLY WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>EVERY JANUARY OR UPON EMPLOYMENT THE ORGANIZATION OBTAINS A CONFLICT OF INTEREST STATEMENT THAT IS REVIEWED AND MAINTAINED IN THE PERSONNEL FILES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR'S/PRESIDENT WAGE IS NEGOTIATED BETWEEN HIMSELF AND THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE DEPUTY DIRECTOR/CLERK AND ALL OTHER EMPLOYEES' WAGE IS NEGOTAATED WITH THE EXECUTIVE DIRECTOR, TEAM LEADER AND THE EMPLOYEE BASED ON JOB CATEGORY, DESCRIPTION AND EXPERIENCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATIONS GOVERNING DOCUMENTS, FINANCIAL STATEMENTS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>LOSS DUE TO THEFT -106,099 DURING THE YEAR ENDED SEPTEMBER 30, 2024, NESCAUM INCURRED A LOSS TOTALING 106,099 DUE TO A SPOOFING ATTACK. SPOOFING IS A FORM OF CYBER FRAUD IN WHICH ATTACKS DISGUISE THEMSELVES AS A TRUSTED ENTITY TO MANIPULATE VICTIMS INTO DISCLOSING SENSITIVE INFORMATION OR TRANSFERRING FUNDS. NESCAUM HAS SINCE ADOPTED POLICIES AND PROCEDURES TO MITIGATE THE RISK OF SIMILAR INCIDENTS IN THE FUTURE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
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