GLOSSARY OF TERMS The following abbreviations and acronyms are used in this report to identify FirstEnergy Corp. and its current and former subsidiaries: AE Supply Allegheny Energy Supply Company, LLC, an unregulated generation subsidiary AGC Allegheny Generating Company, a generation subsidiary of MP ATSI American Transmission Systems, Incorporated, a subsidiary of FET, which owns and operates transmission facilities CEI The Cleveland Electric Illuminating Company, an Ohio electric utility operating subsidiary FE FirstEnergy Corp., a public utility holding company FELHC, Inc. FirstEnergy License Holding Company FENOC Energy Harbor Nuclear Corp. (formerly known as FirstEnergy Nuclear Operating Company), a subsidiary of EH, which operates EH’s nuclear generating facilities FES Energy Harbor LLC. (formerly known as FirstEnergy Solutions Corp.), a subsidiary of EH, which provides energyrelated products and services FES Debtors FENOC, FES, and FES’ subsidiaries as of March 31, 2018 FESC FirstEnergy Service Company, which provides legal, financial, and other corporate support services FET FirstEnergy Transmission, LLC, the parent company of ATSI, MAIT and TrAIL, and has a joint venture in PATH FEV FirstEnergy Ventures Corp., which invests in certain unregulated enterprises and business ventures FG Energy Harbor Generation LLC (formerly known as FirstEnergy Generation, LLC), a subsidiary of EH, which owns and operates fossil generating facilities FirstEnergy FirstEnergy Corp., together with its consolidated subsidiaries Global Holding Global Mining Holding Company, LLC, a joint venture between FEV, WMB Marketing Ventures, LLC and Pinesdale LLC GPU GPU, Inc., former parent of JCP&L, ME and PN, that merged with FE on November 7, 2001 JCP&L Jersey Central Power & Light Company, a New Jersey electric utility operating subsidiary KATCo Keystone Appalachian Transmission Company, a former subsidiary of FET which became a subsidiary of FE in May 2022 MAIT Mid-Atlantic Interstate Transmission, LLC, a subsidiary of FET, which owns and operates transmission facilities ME Metropolitan Edison Company, a Pennsylvania electric utility operating subsidiary MP Monongahela Power Company, a West Virginia electric utility operating subsidiary OE Ohio Edison Company, an Ohio electric utility operating subsidiary Ohio Companies CEI, OE and TE PATH Potomac-Appalachian Transmission Highline, LLC, a joint venture between FE and a subsidiary of AEP PATH-Allegheny PATH Allegheny Transmission Company, LLC PATH-WV PATH West Virginia Transmission Company, LLC PE The Potomac Edison Company, a Maryland and West Virginia electric utility operating subsidiary Penn Pennsylvania Power Company, a Pennsylvania electric utility operating subsidiary of OE Pennsylvania Companies ME, PN, Penn and WP PN Pennsylvania Electric Company, a Pennsylvania electric utility operating subsidiary Signal Peak Signal Peak Energy, LLC, an indirect subsidiary of Global Holding that owns mining operations near Roundup, Montana TE The Toledo Edison Company, an Ohio electric utility operating subsidiary TrAIL Trans-Allegheny Interstate Line Company, a subsidiary of FET, which owns and operates transmission facilities Transmission Companies ATSI, MAIT and TrAIL Utilities OE, CEI, TE, Penn, JCP&L, ME, PN, MP, PE, and WP WP West Penn Power Company, a Pennsylvania electric utility operating subsidiary iii
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