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        <ExplanationTxt>THE AMOUNTS RECORDED ON LINE 21 OF PART X ON FORM 990 CONSIST OF WORKING CAPITAL RESERVES AND CASH COLLATERAL SECURITY DEPOSITS RECEIVED FROM MARKET PARTICIPANTS. ALL MARKET PARTICIPANTS CONTRIBUTE TO A WORKING CAPITAL RESERVE FUND, TOTALING $38,357,424 AT 12/31/23, WHICH IS USED TO PRESERVE LIQUIDITY IN THE NYISO MARKETS. ACCUMULATED INTEREST ON THE WORKING CAPITAL FUND IS DISTRIBUTED ANNUALLY TO MARKET PARTICIPANTS. ADDITIONALLY, CERTAIN MARKET PARTICIPANTS PROVIDE CASH AS COLLATERAL TO MEET THEIR NYISO CREDITWORTHINESS REQUIREMENTS. DEPOSITS TOTAL $342,531,160 AT 12/31/23 AND ARE INVESTED IN MONEY MARKET FUNDS. INTEREST/ DIVIDENDS ARE PROVIDED TO PARTICIPANTS MONTHLY.</ExplanationTxt>
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        <ExplanationTxt>NYISO HAS BEEN RECOGNIZED BY THE INTERNAL REVENUE SERVICE AS AN ORGANIZATION DESCRIBED IN INTERNAL REVENUE CODE (THE CODE) SECTION 501(c)(3) AND IS GENERALLY EXEMPT FROM INCOME TAXES UNDER SECTION 501(A) OF THE CODE. NYISO HAS DETERMINED, PRIOR TO RECORDING ANY BENEFIT IN THE FINANCIAL STATEMENTS, THAT IT IS MORE LIKELY THAN NOT THAT THE TAX POSITION WILL BE SUSTAINED UPON EXAMINATION BY THE APPROPRIATE TAXING AUTHORITIES, AS REQUIRED BY THE ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES TOPIC OF FASB ASC (FIN48/ ASC 740). A TAX POSITION IS MEASURED AT THE LARGEST AMOUNT OF BENEFIT THAT IS GREATER THAN 50 PERCENT LIKELY OF BEING REALIZED UPON SETTLEMENT</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>REVENUE ADJUSTMENT RELATED TO THE FAIR MARKET VALUE OF INTEREST RATE SWAPS RESULTING FROM THE ORGANIZATIONS RATE SETTING PROCESS - 1146150 EXPENSES RELATED TO 457B PROGRAM RESULTING FROM UNREALIZED LOSS ON INVESTMENT - -540797 CHANGE IN FAIR MARKET VALUE OF MARKETABLE SECURITIES - 540797</ExplanationTxt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>844</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>43119</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>26668</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>326624</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>KEVIN PYTEL</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>SENIOR MANAGER OF PRODUCT &amp; PROJECT MANAGEMENT</TitleTxt>
        <BaseCompensationFilingOrgAmt>214173</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>26460</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>335</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>30418</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>24927</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>296313</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>ERIC ADAMS</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>MANAGER, FACILITIES</TitleTxt>
        <BaseCompensationFilingOrgAmt>174234</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>20062</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1138</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>33140</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>16346</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>244920</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>KAREN G GACH</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>DEPUTY GENERAL COUNSEL</TitleTxt>
        <BaseCompensationFilingOrgAmt>283182</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>171130</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>27662</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>136574</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>23856</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>642404</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>88686</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>RAYMOND W STALTER</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>DIRECTOR, REGULATORY AFFAIRS</TitleTxt>
        <BaseCompensationFilingOrgAmt>259908</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>107463</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>2757</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>125038</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>1725</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>496891</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>51390</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>SHAUN P JOHNSON</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>DIRECTOR, MARKET DESIGN</TitleTxt>
        <BaseCompensationFilingOrgAmt>247620</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>102488</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>4605</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>91261</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>25441</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>471415</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>48938</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>MATTHEW A ANGLIN</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>DIRECTOR OF ENTERPRISE SECURITY &amp; CISO</TitleTxt>
        <BaseCompensationFilingOrgAmt>222393</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>102846</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>24163</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>84311</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>16887</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>450600</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>50134</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>PATRICK KELLY</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>CONTROLLER &amp; ASSISTANT TREASUREER</TitleTxt>
        <BaseCompensationFilingOrgAmt>205411</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>88833</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>18862</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>73311</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>8101</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>394518</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>TODD P ROMANSKY</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>MANAGER, IT OPERATIONS &amp; SERVICE MGMT</TitleTxt>
        <BaseCompensationFilingOrgAmt>187124</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>22066</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>582</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>35721</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>25585</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>271078</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 7 Non-fixed payments</FormAndLineReferenceDesc>
        <ExplanationTxt>AMOUNTS LISTED ON FORM 990, PART VII, FOR NYISO OFFICERS AND EMPLOYEES, INCLUDE PAYMENTS MADE AND ACCRUED PURSUANT TO NYISO'S ANNUAL INCENTIVE PROGRAM AND LONG-TERM INCENTIVE PLAN FOR NYISO OFFICERS AND CERTAIN EMPLOYEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3 COMPENSATION OF CEO</FormAndLineReferenceDesc>
        <ExplanationTxt>TO DETERMINE THE COMPENSATION OF NYISO'S PRESIDENT AND CHIEF EXECUTIVE OFFICER, NYISO, THROUGH COLLABORATION WITH OTHER INDEPENDENT SYSTEM OPERATORS AND REGIONAL TRANSMISSION ORGANIZATIONS, PERIODICALLY ENGAGES AN INDEPENDENT EXECUTIVE COMPENSATION FIRM TO PERFORM A BENCHMARK COMPENSATION ASSESSMENT TO AID NYISO'S BOARD OF DIRECTORS IN THEIR REVIEW OF THE PRESIDENT AND CHIEF EXECUTIVE OFFICER'S COMPENSATION. IN ADDITION, AS PART OF THIS COMPENSATION ASSESSMENT, THE FORM 990 OF OTHER RELEVANT ORGANIZATIONS (INCLUDING OTHER INDEPENDENT SYSTEM OPERATORS AND REGIONAL TRANSMISSION ORGANIZATIONS ) ARE REVIEWED. THE RESULTS OF THIS ASSESSMENT ARE PROVIDED TO THE COMMERCE AND COMPENSATION COMMITTEE OF NYISO'S BOARD OF DIRECTORS FOR REVIEW ANNUALLY. THE COMMERCE AND COMPENSATION COMMITTEE MAKES A RECOMMENDATION REGARDING THE PRESIDENT AND CHIEF EXECUTIVE OFFICER'S COMPENSATION TO THE BOARD OF DIRECTORS, AND THE BOARD OF DIRECTORS AUTHORIZES THE PRESIDENT AND CHIEF EXECUTIVE OFFICER'S COMPENSATION ANNUALLY. THE PRESIDENT AND CHIEF EXECUTIVE OFFICER HAS A WRITTEN EMPLOYMENT CONTRACT WITH CONDITIONS APPROVED BY THE BOARD OF DIRECTORS. NYISO COMPLIES WITH THE THREE REQUIREMENTS OF THE REBUTTABLE PRESUMPTION STANDARD, AS OUTLINED IN TREASURY REGULATIONS SECTION 53.4958-6: (1) EXECUTIVE COMPENSATION IS AUTHORIZED BY THE NYISO'S BOARD OF DIRECTORS, WHICH IS COMPOSED ENTIRELY OF INDIVIDUALS WHO DO NOT HAVE A CONFLICT OF INTEREST WITH RESPECT TO THE COMPENSATION ARRANGEMENT (2) THE BOARD OF DIRECTORS AUTHORIZING EXECUTIVE COMPENSATION OBTAINS AND RELIES ON APPROPRIATE DATA AS TO COMPARABILITY PRIOR TO MAKING DETERMINATIONS, AND (3) THE BOARD OF DIRECTORS ADEQUATELY DOCUMENTS THE BASIS FOR DETERMINATIONS CONCURRENTLY WITH MAKING THE DETERMINATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part II, Column (B)(ii) BONUS AND INCENTIVE COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>COLUMN B(II) BONUS AND INCENTIVE COMPENSATION INCLUDES AMOUNTS PAID IN 2023 UNDER NYISO'S ANNUAL INCENTIVE PROGRAM AND LONG-TERM INCENTIVE PLAN. NYISO'S LONG TERM INCENTIVE PLAN PROVIDES CERTAIN MEMBERS OF SENIOR MANAGEMENT WITH DEFERRED COMPENSATION BENEFITS. BENEFITS ARE BASED UPON THE ACHIEVEMENT OF THREE-YEAR PERFORMANCE GOALS ESTABLISHED BY THE BOARD OF DIRECTORS. THESE AMOUNTS ARE SUBJECT TO FORFEITURE IF THE EMPLOYEE VOLUNTARILY ENDS THEIR EMPLOYMENT WITH NYISO OR IS TERMINATED FOR CAUSE. LONG TERM INCENTIVE PLAN PAYMENTS ARE PAID IN EQUAL INSTALLMENTS OVER THREE YEARS FOLLOWING COMPLETION OF THE THREE-YEAR CYCLE. A PARTICIPANT IS VESTED IN THAT PORTION OF THE AWARD THAT IS PAYABLE TO THE PARTICIPANT AS OF A DISTRIBUTION DATE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part II, Column (C) COLUMN C DEFERRED COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>COLUMN C REFLECTS "DEFERRED COMPENSATION", WHICH INCLUDES AMOUNTS EARNED AND ACCRUED IN 2023 UNDER THE LONG-TERM INCENTIVE PLAN, 401K CONTRIBUTIONS, THE ANNUAL INCREASE OR DECREASE IN ACTUARIAL VALUE OF ACCRUED PENSION BENEFITS AND ACCRUED POST RETIREMENT BENEFITS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="23017437" softwareVersionNum="2023v5.1">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V, Line 2a TOTAL NUMBER OF INDIVIDUALS EMPLOYED IN CALENDAR YEAR 2023</FormAndLineReferenceDesc>
        <ExplanationTxt>NYISO'S RESPONSES TO THESE QUESTIONS INDICATE 673 AS THE TOTAL NUMBER OF EMPLOYEES. AS PER THE FORM 990 INSTRUCTIONS, THIS TOTAL REPRESENTS THE NUMBER OF WAGE FORMS FOR EMPLOYEES (INCLUDING STUDENT INTERNS AND PART-TIME EMPLOYEES) ON NYISO'S PAYROLL AT ANY POINT DURING 2023. THE TOTAL NUMBER OF NYISO EMPLOYEES ON DECEMBER 31, 2023, WAS 599, THE MAJORITY OF WHOM ARE PROFESSIONAL POWER SYSTEM ENGINEERS, NERC CERTIFIED SYSTEM OPERATORS, ACCOUNTANTS, ECONOMISTS AND ATTORNEYS WITH BACHELORS AND/OR POSTGRADUATE DEGREES. ALL NYISO EMPLOYEES HAVE BEEN SUBJECTED TO EXTENSIVE SECURITY REVIEWS, IN COOPERATION WITH THE UNITED STATES DEPARTMENTS OF ENERGY AND HOMELAND SECURITY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6 MEMBERS OR STOCKHOLDERS</FormAndLineReferenceDesc>
        <ExplanationTxt>NYISO DOES NOT HAVE ANY MEMBERS OR STOCKHOLDERS WITH OWNERSHIP RIGHTS IN NYISO OR ITS ASSETS. IN ACCORDANCE WITH NYISO'S GOVERNING DOCUMENTS, ENTITIES THAT PARTICIPATE IN THE NYISO-ADMINISTERED MARKETS MAY TAKE PART IN A COMMITTEE PROCESS TO DEVELOP NYISO'S BUDGET AND MODIFICATIONS TO NYISO'S TARIFFS AND PROCEDURES, WHICH ARE THEN RECOMMENDED TO NYISO'S BOARD FOR ITS APPROVAL. NYISO'S BOARD MAINTAINS THE ULTIMATE RESPONSIBILITY FOR THE GOVERNANCE DECISIONS OF NYISO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a ELECT MEMBERS OF THE GOVERNING BODY</FormAndLineReferenceDesc>
        <ExplanationTxt>NYISO'S BOARD OF DIRECTORS MAKES FINAL DETERMINATIONS TO FILL VACANCIES ON THE BOARD. NYISO STAKEHOLDERS PARTICIPATING IN THE MANAGEMENT COMMITTEE ( NYISO'S HIGHEST RANKING STAKEHOLDER COMMITTEE WITH REPRESENTATIVES FROM GENERATION OWNERS, TRANSMISSION OWNERS, END-USE CONSUMERS, PUBLIC POWER/ENVIRONMENTAL PARTIES, AND OTHER SUPPLIERS ) ASSIST IN THIS PROCESS BY CONDUCTING A SEARCH TO IDENTIFY AT LEAST THREE BOARD CANDIDATES FOR EACH VACANCY THAT MEET THE QUALIFICATIONS SPECIFIED IN NYISO'S GOVERNING DOCUMENTS. NYISO'S BOARD MAY SELECT A DIRECTOR FROM THIS LIST, OR IT MAY SEEK A CANDIDATE IDENTIFIED THROUGH ANOTHER SOURCE, SUCH AS AN EXECUTIVE SEARCH FIRM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7b DECISIONS OF THE GOVERNING BODY</FormAndLineReferenceDesc>
        <ExplanationTxt>AS A GENERAL RULE, THE DECISIONS OF NYISO'S BOARD ARE NOT SUBJECT TO THE APPROVAL OF NYISO STAKEHOLDERS. NOTE THAT IN ACCORDANCE WITH NYISO'S GOVERNING DOCUMENTS, NYISO STAKEHOLDERS THAT PARTICIPATE IN NYISO'S HIGHEST RANKING STAKEHOLDER COMMITTEE, THE MANAGEMENT COMMITTEE, HAVE TO ENDORSE CHANGES SOUGHT BY NYISO'S BOARD TO NYISO'S TARIFFS AND GOVERNING DOCUMENTS TO BE FILED PURSUANT TO SECTION 205 OF THE FEDERAL POWER ACT WITH NYISO'S CHIEF REGULATOR - THE FEDERAL ENERGY REGULATORY COMMISSION. HOWEVER, NYISO'S BOARD MAY PURSUE SUCH CHANGES WITHOUT THE MANAGEMENT COMMITTEE'S CONCURRENCE BY FILING PURSUANT TO SECTION 206 OF THE FEDERAL POWER ACT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 8b Documentation of meetings held by committees of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>The NYSIO has no committees with authority to act on behalf of the governing body.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>PRIOR TO FILING, NYISO'S FORM 990 IS REVIEWED BY THE CONTROLLER &amp; ASSISTANT TREASURER AND/OR CHIEF FINANCIAL OFFICER AND PRESIDENT &amp; CHIEF EXECUTIVE OFFICER, AS WELL AS LEGAL COUNSEL. FOLLOWING THE COMPLETION OF REVIEWS BY THESE PARTIES, NYISO'S FORM 990 IS PROVIDED TO THE COMMERCE AND COMPENSATION COMMITTEE OF NYISO'S BOARD OF DIRECTORS ALONG WITH THE REST OF THE BOARD OF DIRECTORS FOR THEIR REVIEW. A COMPLETE COPY OF THE FORM 990 (INCLUDING ALL REQUIRED SCHEDULES), AS ULTIMATELY FILED WITH THE IRS, IS PROVIDED TO THE BOARD OF DIRECTORS BEFORE BEING FILED WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>NYISO PROVIDES TRAINING FOR NEW EMPLOYEES ON A VARIETY OF COMPLIANCE ISSUES, INCLUDING ITS CONFLICTS OF INTEREST POLICY, AND CONDUCTS ANNUAL REFRESHER TRAINING FOR ALL EMPLOYEES, MANAGEMENT AND BOARD MEMBERS. NYISO ALSO PUBLISHES A PROHIBITED INVESTMENT LIST AT LEAST ANNUALLY AND REQUIRES THAT EMPLOYEES, MANAGEMENT AND BOARD MEMBERS SIGN AN ANNUAL COMPLIANCE CERTIFICATE ACKNOWLEDGING THEIR OBLIGATIONS UNDER THE CODE OF CONDUCT AND CERTIFYING THAT THEY HAVE NO PROHIBITED INVESTMENTS OR BUSINESS OR FINANCIAL CONFLICTS OF INTEREST. FURTHER, NYISO PERIODICALLY CONDUCTS A CONFLICTS OF INTEREST SURVEY TO ENSURE EMPLOYEES ARE IN COMPLIANCE WITH THE CONFLICTS OF INTEREST POLICY AND REQUIRE THAT THEY DISCLOSE ANY POSSIBLE CONCERNS TO THE COMPLIANCE OFFICE. EMPLOYEES ALSO HAVE ACCESS TO A COMPLIANCE HOTLINE AND AN EXTERNAL WHISTLEBLOWER SERVICE, SHOULD THEY HAVE A COMPLIANCE QUESTION OR WISH TO REPORT A COMPLIANCE CONCERN. THE COMPLIANCE OFFICE FOLLOWS UP ON REPORTED COMPLIANCE CONCERNS AND ENSURES THAT IDENTIFIED ISSUES ARE HANDLED IN ACCORDANCE WITH NYISO'S POLICIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a Process to establish compensation of top management official</FormAndLineReferenceDesc>
        <ExplanationTxt>TO DETERMINE THE COMPENSATION OF NYISO'S PRESIDENT AND CHIEF EXECUTIVE OFFICER, NYISO, THROUGH COLLABORATION WITH OTHER INDEPENDENT SYSTEM OPERATORS AND REGIONAL TRANSMISSION ORGANIZATIONS, PERIODICALLY ENGAGES AN INDEPENDENT EXECUTIVE COMPENSATION FIRM TO PERFORM A BENCHMARK COMPENSATION ASSESSMENT TO AID NYISO'S BOARD OF DIRECTORS IN THEIR REVIEW OF THE PRESIDENT AND CHIEF EXECUTIVE OFFICER'S COMPENSATION. SUCH BENCHMARKING ASSESSMENT WAS LAST COMPLETED IN 2022. IN ADDITION, AS PART OF THIS COMPENSATION ASSESSMENT, THE FORM 990 OF OTHER RELEVANT ORGANIZATIONS (INCLUDING OTHER INDEPENDENT SYSTEM OPERATORS AND REGIONAL TRANSMISSION ORGANIZATIONS) ARE REVIEWED. THE RESULTS OF THIS ASSESSMENT ARE PROVIDED TO THE COMMERCE AND COMPENSATION COMMITTEE OF NYISO'S BOARD OF DIRECTORS FOR REVIEW ANNUALLY. THE COMMERCE AND COMPENSATION COMMITTEE MAKES A RECOMMENDATION REGARDING THE PRESIDENT AND CHIEF EXECUTIVE OFFICER'S COMPENSATION TO THE BOARD OF DIRECTORS, AND THE BOARD OF DIRECTORS AUTHORIZES THE PRESIDENT AND CHIEF EXECUTIVE OFFICER'S COMPENSATION ANNUALLY. THE PRESIDENT AND CHIEF EXECUTIVE OFFICER HAS A WRITTEN EMPLOYMENT CONTRACT WITH CONDITIONS APPROVED BY THE BOARD OF DIRECTORS. NYISO COMPLIES WITH THE THREE REQUIREMENTS OF THE REBUTTABLE PRESUMPTION STANDARD, AS OUTLINED IN TREASURY REGULATIONS SECTION 53.4958-6: (1) EXECUTIVE COMPENSATION IS AUTHORIZED BY THE NYISO'S BOARD OF DIRECTORS, WHICH IS COMPOSED ENTIRELY OF INDIVIDUALS WHO DO NOT HAVE A CONFLICT OF INTEREST WITH RESPECT TO THE COMPENSATION ARRANGEMENT (2) THE BOARD OF DIRECTORS AUTHORIZING EXECUTIVE COMPENSATION OBTAINS AND RELIES ON APPROPRIATE DATA AS TO COMPARABILITY PRIOR TO MAKING DETERMINATIONS, AND (3) THE BOARD OF DIRECTORS ADEQUATELY DOCUMENTS THE BASIS FOR DETERMINATIONS CONCURRENTLY WITH MAKING THE DETERMINATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b Process to establish compensation of other employees</FormAndLineReferenceDesc>
        <ExplanationTxt>TO DETERMINE THE COMPENSATION OF NYISO'S OFFICERS, NYISO, THROUGH COLLABORATION WITH OTHER INDEPENDENT SYSTEM OPERATORS AND REGIONAL TRANSMISSION ORGANIZATIONS, PERIODICALLY ENGAGES AN INDEPENDENT EXECUTIVE COMPENSATION FIRM TO PERFORM A BENCHMARK COMPENSATION ASSESSMENT TO AID NYISO'S BOARD OF DIRECTORS IN THEIR REVIEW OF OFFICER'S COMPENSATION. SUCH BENCHMARKING ASSESSMENT WAS LAST COMPLETED IN 2022. IN ADDITION, THE FORM 990 OF OTHER RELEVANT ORGANIZATIONS (INCLUDING OTHER INDEPENDENT SYSTEM OPERATORS AND REGIONAL TRANSMISSION ORGANIZATIONS) ARE REVIEWED. THE PRESIDENT AND CHIEF EXECUTIVE OFFICER PROVIDES THE RESULTS OF THIS ASSESSMENT AND HIS RECOMMENDATIONS TO THE COMMERCE AND COMPENSATION COMMITTEE OF NYISO'S BOARD OF DIRECTORS FOR REVIEW ANNUALLY. THE COMMERCE AND COMPENSATION COMMITTEE WILL MAKE RECOMMENDATIONS REGARDING THE OFFICERS COMPENSATION TO THE BOARD OF DIRECTORS, AND THE BOARD OF DIRECTORS WILL AUTHORIZE THE OFFICERS COMPENSATION ANNUALLY. THIS REVIEW IS PERFORMED ANNUALLY AND INCLUDES CONTEMPORANEOUS DOCUMENTATION OF DELIBERATIONS AND DECISIONS REGARDING THE COMPENSATION ARRANGEMENTS. SIMILARLY, KEY EMPLOYEE POSITIONS ARE PERIODICALLY BENCHMARKED BY INDEPENDENT COMPENSATION FIRMS AND/OR AGAINST SIMILAR POSITIONS IN OTHER ORGANIZATIONS AND INDUSTRIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>NYISO'S GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICY ARE PART OF ITS FEDERALLY APPROVED TARIFFS. THESE DOCUMENTS ARE ON FILE AT FERC AND ARE PUBLISHED ON NYISO'S WEBSITE. NYISO'S FINANCIAL STATEMENTS ARE INCLUDED IN AN ANNUAL REPORT, PUBLISHED ON NYISO'S WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 2f Other Program Service Revenue</FormAndLineReferenceDesc>
        <ExplanationTxt>WIND FORECASTING SUBSCRIPTION - Total Revenue: 400019, Related or Exempt Function Revenue: 400019, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ; RMR REVENUE - Total Revenue: 315043, Related or Exempt Function Revenue: 315043, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ;</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g Other Fees</FormAndLineReferenceDesc>
        <ExplanationTxt>MARKET MONITORING - Total Expense: 4662154, Program Service Expense: 4662154, Management and General Expenses: , Fundraising Expenses: ; PLANNING STUDIES - Total Expense: 9672831, Program Service Expense: 9672831, Management and General Expenses: , Fundraising Expenses: ; OTHER CONSULTING SRV - Total Expense: 14548645, Program Service Expense: 14548645, Management and General Expenses: , Fundraising Expenses: ;</ExplanationTxt>
      </SupplementalInformationDetail>
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          <AddressLine1Txt>10 KREY BLVD</AddressLine1Txt>
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