2026-07-30T18:01:32-05:00 2025-12-31 135565207 KPMG LLP 60 E RIO SALADO PKWY SUITE 800 TEMPE AZ 85281 990 2025-01-01 271623493 NEW YORK INDEPENDENT SYSTEM OPERATOR NYIS 3132229053 PO BOX 630858 CINCINNATI OH 452630858 MATT CAROTHERS DIRECTOR 3132229053 2026-07-30 LYLE J MOHLER P01340349 4804593500 2026-07-30 2025 2025-03-06 01:10:19Z X NEW YORK INDEPENDENT SYSTEM OPERATOR HEALTH AND WELFARE BENEFITS PLAN TRUST 1225574 false X N/A X 2009 NY NEW YORK INDEPENDENT SYSTEM OPERATOR INC. HAS ESTABLISHED A MEDICAL BENEFIT PLAN FOR ELIGIBLE RETIREES AND THEIR QUALIFIED DEPENDENTS. 1 1 0 0 0 0 259859 797174 413834 381335 0 673693 1178509 0 654901 595771 5225 3647 0 0 15899 16569 676025 615987 -2332 562522 5321822 6001505 22971 140132 5298851 5861373 NEW YORK INDEPENDENT SYSTEM OPERATOR INC. HAS ESTABLISHED A MEDICAL BENEFIT PLAN FOR ELIGIBLE RETIREES AND THEIR QUALIFIED DEPENDENTS. false false 595771 PROVIDES MEDICAL INSURANCE BENEFITS TO ALL ELIGIBLE RETIREES AND THEIR QUALIFIED DEPENDENTS OF NEW YORK INDEPENDENT SYSTEM OPERATOR INC. 595771 false false false false false false false false false false false false false false false true false false false false false false false false false false false false false false false false false false false false false false false false false true false false true 0 0 0 false false false false false false false false false false false false false X 1 1 false false false false false true false false false false false true false false false false false false X COMERICA BANK 8774051091 36455 CORPORATE DRIVE FARMINGTON HILLS MI 48331 COMERICA BANK TRUSTEE X 3647 0 0 3647 0 0 false false false COMPANY & EMPLOYEE CONTRIBUTIONS 525100 797174 797174 797174 182534 182534 245866 47065 198801 198801 198801 1178509 995975 182534 595771 595771 3647 3647 16569 16569 615987 599418 16569 0 96060 309414 38546 51940 5187216 5640151 5321822 6001505 22971 140132 22971 140132 X 5298851 5861373 5298851 5861373 5321822 6001505 X 562522 X X false true X true false 1783968 625675 625675 1158293 20216 20216 1178509 595771 595771 20216 20216 615987 PART XII, LINE 2C NEW YORK INDEPENDENT SYSTEM OPERATOR INC'S AUDIT AND COMPLIANCE COMMITTEE SELECTS AN INDEPENDENT ACCOUNTANT AND OVERSEES THE AUDIT OF THE ORGANIZATION'S FINANCIAL STATEMENTS. EXPLANATION FOR FORM 990, PAGE 6, PART VI, LINE 1a COMERICA BANK IS THE INSTITUTIONAL TRUSTEE, NEW YORK INDEPENDENT SYSTEM OPERATOR INC. IS THE PLAN ADMINISTRATOR. OVERSIGHT IS PROVIDED BY EMPLOYEES OF NEW YORK INDEPENDENT SYSTEM OPERATOR, INC. EXPLANATION FOR FORM 990, PAGE 6, PART VI, LINE 7a NEW YORK INDEPENDENT SYSTEM OPERATOR, INC, AS THE PLAN ADMINISTRATOR MAY APPOINT OR REPLACE THE INSTITUTIONAL TRUSTEE. EXPLANATION FOR FORM 990, PAGE 6, PART VI, LINE 8a THE INSTITUTIONAL TRUSTEE MAKES DISBURSEMENTS ON BEHALF OF THE RETIREES, AND THEIR QUALIFIED DEPENDENTS AT THE REQUEST OF NYISO. EXPLANATION FOR FORM 990, PAGE 6, PART VI, LINE 8b THE TRUSTEE HAS NOT APPOINTED A COMMITTEE WITH AUTHORITY TO ACT ON IT'S BEHALF. FORM 990, PAGE 6, PART VI, LINE 11-DESCRIPTION OF PROCESS FOR REVIEW COMERICA BANK IS THE TRUSTEE. THE TRUSTEE REVIEWED THE RETURN BEFORE IT WAS FILED AS PRESCRIBED IN THE DOCUMENT UNDER DUTIES OF THE TRUSTEE. NYISO'S CFO, CONTROLLER, AND ACCOUNTING MANAGER ALSO REVIEW THE RETURN. FORM 990, PAGE 6, PART VI, LINE 19 TRUSTEE HAS COPIES AVAILABLE FOR PUBLIC INSPECTION. NEW YORK INDEPENDENT SYSTEM OPERATOR INC 10 KREY BLVD RENSSELAER NY 12144 141815612 MAINTAIN THE RELIABILITY OF THE BULK POWER & NY 501(C)3 509(A)(2) NYISO false false false false false false false false false false false false false false false false true false false false NEW YORK INDEPENDENT SYSTEM OPERATOR INC p 654901 ACT TRANSACTION