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      <PrincipalOfficerNm>Gordon van Welie CEO</PrincipalOfficerNm>
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      <Desc>Reference Line 4a: Energy Administration - ISO New England Inc. (ISO-NE) is the not-for-profit organization authorized by the federal government to perform three critical activities to ensure the reliable and safe supply of electricity throughout New England. Through its first activity, Energy Administration, ISO-NE ensures the constant availability of competitively-priced electricity for the region's 14.8 million residents by designing, refining, and administering the region's wholesale electricity markets and making sure these markets are fair and competitive. During 2018, ISO-NE was responsible for the fair administration of over $9.6 billion dollars of market transactions.</Desc>
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        <Desc>Reference Line 4b: Reliability Administration - Through its second activity, Reliability Administration, ISO-NE ensures the reliable day-to-day operation of the region's high voltage transmission system. Among other things, this involves (i) coordinating the region's 350 power plants and 9,000 miles of high voltage transmission lines; (ii) managing the movement of high-voltage electricity into, within, and out of New England; (iii) ensuring that the six-state region has the power system resources necessary to meet consumer demand for electricity and federally-mandated reliability requirements; (iv) coordinating how transmission lines, power plants (such as coal, oil, nuclear, and natural gas-fired), and other resources connect to and operate on the power grid reliably; and (v), working with the industry to develop transmission infrastructure solutions that are essential for maintaining power system reliability. During 2018, ISO-NE coordinated the generation and transmission of the 123,307 gigawatt-hours of power consumed in the region.</Desc>
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        <PersonNm>Jamshid A Afnan</PersonNm>
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        <PersonNm>Robert G Ethier</PersonNm>
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        <PersonNm>Anne C George</PersonNm>
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        <PersonNm>Maria A Gulluni</PersonNm>
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        <PersonNm>Lorraine M Brady</PersonNm>
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        <PersonNm>Jeffrey McDonald</PersonNm>
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        <PersonNm>Mark G Karl</PersonNm>
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        <PersonNm>Matthew W White</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>During 2018 ISO New England paid a Key Employee for an employee recognition program award, and paid two Officers, one Key Employee and one Five Highest Compensated employee for wellness program rewards. The total compensation amounts to these five individuals, for the employee recognition and wellness programs, was $820 in addition to $345 for tax gross-up for these programs. The taxable wellness program rewards are available to all employees who register for and successfully complete company offered wellness programs. The taxable Employee Recognition Program is available to all employees with exception of the CEO, Executive/Senior Vice President, and Vice Presidents. The Employee Recognition Program recognizes employee achievements or accomplishments that contribute to the overall objective of the business. It encourages employees to excel in ISO core competencies, either individually or through teams.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>Theodore Paradise received a severance payment in the amount of $24,104.77.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>ISO New England currently administers two incentive compensation plans that both provide for non-fixed payments: an annual performance incentive plan (the "API Plan") and a long-term incentive plan (the "LTI Plan"). Subject to certain eligibility criteria, most employees may receive an API Plan award based upon a formula that takes into account organizational performance, individual performance, annual base pay (as December 31st of the plan year) and a grade-related salary percentage. Organizational performance is measured by the Board of Directors of ISO New England (the "Board") against goals and objectives developed by the Compensation and Human Resources Committee of the Board (the "Committee"), other Board committees, and the Board at the commencement of each plan year. The individual performance of an officer is evaluated by the Committee and the Board. The final API Plan award for an officer is calculated and paid once the Board determines the scores for organizational performance and individual performance for the plan year. The LTI Plan awards are available to officers and certain other employees and are based upon the achievement of organizational and individual long-term goals established by recommendation of the Committee (with input from other Board committees) and with the approval of the Board. Similar to the API Plan, the LTI Plan awards are calculated using an eligible employee's base salary in effect as of December 31st of the plan year and a grade-related salary percentage; however, LTI Plan awards generally are paid two and one-half years after the end of the plan year. The Board assesses the performance of the organization and the individual at the end of each plan year, and reassesses the organization's progress towards its long-term goals and objectives two and one-half years later, immediately prior to the calculation and pay-out of the LTI Plan award. Under both plans, ISO New England reserves the right to reduce or eliminate plan awards if the eligible employee or the organization underperforms or there is a major collapse of the bulk electric power system managed by ISO New England.</ExplanationTxt>
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      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
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        <ExplanationTxt>November 30, 2017 the Arbitrage rebate Calculation was completed.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule L, Part IV</FormAndLineReferenceDesc>
        <ExplanationTxt>Line 1 - GRT Inc. is a software consulting firm that performs services for ISO New England Inc. Mr. Victor Litvinov is a family member of Eugene Litvinov, current Key Employee. Victor Litvinov is an officer of GRT Inc. The amount in column (c) represents payments made to GRT Inc. for 2018. Line 2 - Ralph Slate is a family member of Maria Gulluni, current Officer. Compensation as an employee of ISO New England Inc. in the position of Principal Data Architect. The amount in column (c) represents payments made to Ralph Slate for 2018. Line 3 - Catherine Simonelli is a family member of John Simonelli, current Key Employee. Compensation as an employee of ISO New England Inc. in the position of Senior EMS Support Specialist. The amount in column (c) represents payments made to Catherine Simonelli in 2018.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ISO New England Inc. is governed by a ten-person Board of Directors. Nine of the individuals on the Board of Directors are independent voting directors, and act also as voting members of ISO New England Inc. (The tenth individual on the Board of Directors is the President and Chief Executive Officer of ISO New England Inc.; he is a non-voting director and is not a member of ISO New England Inc.). The voting members of ISO New England Inc. and the Board of Directors of ISO New England Inc. have no financial interest in any company doing business in New England's electricity markets and are elected to their positions because of their expertise in financial markets, law, and/or electric power operations and regulation.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Members of the Board of Directors are elected by the current voting directors of the Board in their capacity as members of ISO New England Inc. They are nominated by the Nominating and Governance Committee of the Board of Directors, which is a standing committee consisting of three or more members of the Board of Directors of the Company. Each member of the Committee must meet all independence standards imposed under the Company's charter, by-laws and code of conduct, as well as any other applicable independence standards adopted by the Board of Directors. Before the formal nomination and election, a joint nominating committee composed of stakeholders and members of the Board develops the slate of candidates for election.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 is prepared by the Lead Financial Analyst and then reviewed and commented upon by the Supervisor, Budget and Financial Reporting. The Form 990 is then reviewed and commented upon by the Director, Finance &amp; Accounting, and then by ISO New England's external tax counsel, Chief Financial and Compliance Officer and then reviewed by the Audit &amp; Finance Committee of the Board of Directors and then by ISO New England's full Board of Directors prior to being filed.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ISO New England has a "Code of Conduct" that applies to its directors and employees (including officers and key employees). The Audit and Finance Committee of the Board of Directors oversees the administration of the Code of Conduct and ensures that prompt action is taken to investigate any potential violations of, or noncompliance with, the Code of Conduct. When a member of the Board of Directors is involved, the full Board makes the relevant determination. On behalf of the Audit and Finance Committee, the Compliance Officer, who is the Vice President, Human Resources, has the day-to-day responsibility for reviewing compliance with the Code of Conduct, including interpreting the Code of Conduct, advising directors, officers and employees regarding potential conflicts of interest and following up on all suspected violations. Individuals subject to the Code of Conduct are prohibited from using their positions to improperly benefit themselves, their family members or the people with whom they cohabitate. Similarly, such individuals are prohibited from having a significant financial interest in any contractor, company, business, or enterprise which has, or is seeking to establish, business relations with ISO New England Inc., unless that relationship has been disclosed to the Compliance Officer or his or her designee and approved by the Audit and Finance Committee of the Board of Directors. Individuals subject to the Code of Conduct are obligated to identify activities of another director, officer or employee that do not comply with the Code of Conduct and report them to the Compliance Officer. Such reports may be made on a confidential basis and individuals will not be subject to retaliatory actions for making such reports. Individuals who violate the Code of Conduct may be subject to disciplinary action including suspension from duties or termination. All directors and employees are required to sign an annual compliance certificate that states, among other things, that the individual has read, fully understands and will comply with the Code of Conduct.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The compensation of the chief executive officer and of each of the other senior executive officers of ISO New England Inc. (the "Company") is determined in a manner so that the total compensation of each individual is presumed to be reasonable in accordance with Treasury Regulation § 53.4958-6. In accordance with this Treasury Regulation: (i) each compensation arrangement is approved in advance by the members of the Board of Directors (the "Board") and/or of the Compensation and Human Resources Committee of the Board (the "Committee") who do not have a conflict of interest with respect to that compensation arrangement (as set forth in Treas. Reg. § 53.4958-6(c)(1)(iii)); (ii) each of the Board and the Committee obtains and relies upon appropriate data as to comparability prior to making its determination regarding a compensation arrangement; and (iii) the basis for the compensation-related determination made by the Board or the Committee is adequately documented concurrently with the making of the determination. The Company's overall compensation policy is designed to promote the tax-exempt purposes of the Company by attracting, retaining and motivating highly-skilled senior management to deliver superior service in furtherance of the Company's exempt purpose: to lessen the burdens on government through the administration of an efficient and reliable electricity transmission system, wholesale electricity marketplace and comprehensive regional bulk power system planning process for the benefit of New England. For each fiscal year, the Committee develops recommendations regarding: (i) the base salary of each senior executive; (ii) the annual performance incentive plan (i.e. the short-term incentive compensation plan) goals and objectives for the plan year for the Company and each senior executive; (iii) the long-term incentive compensation plan goals and objectives for the plan year for the Company and each senior executive; and (iv) proposed changes, if any, to the Company's fringe benefit plans. At the end of each fiscal year, the Committee also makes recommendations regarding the performance of the Company and each senior executive against the plan year goals and objectives established under both the short-term incentive compensation plan and the long-term incentive compensation plan. All of the aforementioned Committee recommendations are based upon information and materials derived from a number of sources, including: evaluations of the Company's performance, requirements and short- and long-range strategic plans as prepared by the Board, Board committees and senior executives; evaluations of the performance of each senior executive's performance as prepared by the Board, the Committee and/or senior executives; salary and other compensation surveys conducted by independent human resources and compensation consulting firms; reports and findings prepared by an independent human resources and compensation consulting firm retained by the Company to evaluate the reasonableness of the compensation paid to senior executives; and written and anecdotal information collected by the Human Resources Department of the Company in connection with the recruitment and retention of senior executives for the Company (including reports provided by executive recruitment firms). The compensation-related recommendations made by the Committee are referred to the Board for its review, together with all evaluations, surveys, consultant reports and findings and other information compiled by the Committee. The Board reviews the recommendations and material provided by the Committee, and considers the recommendations in light of: the performance, financial condition, requirements, and exempt purpose goals and objectives of the Company; the performance, experience, and responsibilities of each senior executive; and the competitive market for executive talent. The recommendations also are weighed against a range of reasonable compensation established for each of the Company's executives by an independent human resources and compensation consulting firm (in 2018, Mercer), based upon independent survey sources and compensation information for functionally-comparable positions provided or made available by other regional transmission operators, independent systems operators, and other similarly situated taxable and tax-exempt organizations. Based on the foregoing, the Board makes a final decision regarding each of the elements of each senior executive's compensation, including: base salary; the current fiscal year's goals and objectives for each of the Company and the executive for each of the short-term incentive compensation plan and the long-term incentive compensation plan; changes (if any) to the Company's fringe benefit plans; the performance scores against the prior fiscal year's goals and objectives for each of the Company and the executive for each of the short-term incentive compensation plan and the long-term incentive compensation plan; and the final payments to be made in the current fiscal year under the Company's incentive compensation plans based upon those Company and individual performance scores. Each compensation-related decision of the Board is documented in the minutes of the meeting or meetings at which that decision is made including the materials and information relied upon to make the decision, the identity of the members of the Board making the decision and a summary of the Board's deliberations and reasons underlying the decision. Those minutes are thereafter reviewed and, with any corrections agreed to by the Board, are approved at the next monthly meeting of the Board.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 16a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Company has entered into agreements to share costs for studies and other work of common interest. These cost sharing agreements are with other Independent System Operators (ISOs) and Regional Transmission Organizations (RTOs,) all of which are tax-exempt organizations except for PJM Interconnection LLC, which is a taxable entity organized as a Limited Liability Company. The Company reviews agreements entered into to safeguard its exempt status and to ensure that the Company's participation in the agreements furthers its tax exempt purpose.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 16b</FormAndLineReferenceDesc>
        <ExplanationTxt>The methodology of ISO New England's FIN 48 (ASC 740) analysis includes review and evaluation of the organizations tax exempt status, geographical scope in which it operates, and organizational and operational documents. Included in the review of the operational documents, are any joint venture arrangements. The Director, Finance &amp; Accounting reviews the objective and the scope of any joint venture arrangement, together with any documents memorializing the joint venture arrangement, to safeguard the assets and tax-exempt status of the Company and to ensure that the Company's participation in the joint venture furthers its tax exempt purpose. In addition, ISO New England monitors all activities to ensure that no activity results in its earnings or assets inuring to the benefit of any individual.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ISO New England makes its governing documents, conflict of interest policy (called "The Code of Conduct"), and financial statements available to the public on its website www.iso-ne.com. Each of these documents can be found on the website as follows: Governing Documents and Code of Conduct - https://www.iso-ne.com/about/corporate-governance/corporate-documents, and the financial statements can be found at www.iso-ne.com/about/corporate-governance/financial-performance.</ExplanationTxt>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>ISO New England Inc Retiree Medical Dental and Life Trust</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>One Sullivan Road</AddressLine1Txt>
          <CityNm>Holyoke</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>01040</ZIPCd>
        </USAddress>
        <EIN>137379593</EIN>
        <PrimaryActivitiesTxt>Retiree Insurance</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(9)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>N/A</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
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      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
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      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
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          <BusinessNameLine1Txt>ISO New England Inc Retiree Medical Dental and Life Trust</BusinessNameLine1Txt>
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        <InvolvedAmt>612000</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>cash transactions</MethodOfAmountDeterminationTxt>
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