FirstEnergy Corp. (FirstEnergy) is principally a holding company that holds, directly or indirectly, eight principal electric utility operating subsidiaries: Ohio Edison Company (OE), The Cleveland Electric Illuminating Company (CEI), The Toledo Edison Company (TE), Pennsylvania Power Company (Penn), American Transmission Systems, Inc. (ATSI), Jersey Central Power & Light Company (JCP&L), Metropolitan Edison Company (Met-Ed) and Pennsylvania Electric Company (Penelec). Its revenues are primarily derived from electric service provided by its utility operating subsidiaries and the revenues of its other principal subsidiary, FirstEnergy Solutions Corp. (FES). In addition, FirstEnergy holds other direct subsidiaries, including FirstEnergy Properties, Inc., FirstEnergy Ventures Corp., FirstEnergy Nuclear Operating Company (FENOC), FirstEnergy Securities Transfer Company, GPU Diversified Holdings, LLC, GPU Telecom Services, Inc., GPU Nuclear, Inc. and FirstEnergy Service Company (FESC).