EX-21 6 fe_ex21.txt FE - LIST OF SUBS EXHIBIT 21 FIRSTENERGY CORP. LIST OF SUBSIDIARIES OF THE REGISTRANT AT DECEMBER 31, 2003 Ohio Edison Company - Incorporated in Ohio The Cleveland Electric Illuminating Company - Incorporated in Ohio The Toledo Edison Company - Incorporated in Ohio Centerior Service Company - Incorporated in Ohio FirstEnergy Properties Company - Incorporated in Ohio FirstEnergy Ventures Corporation - Incorporated in Ohio FirstEnergy Facilities Services Group, LLC - Incorporated in Ohio FirstEnergy Securities Transfer Company - Incorporated in Ohio FirstEnergy Service Company - Incorporated in Ohio FirstEnergy Solutions Corp. - Incorporated in Ohio MARBEL Energy Corporation - Incorporated in Ohio FirstEnergy Nuclear Operating Company - Incorporated in Ohio FirstEnergy Holdings, LLC - Incorporated in Ohio FE Acquisition Corp. - Incorporated in Ohio American Transmission Systems, Inc. - Incorporated in Ohio FELHC, Inc. - Incorporated in Ohio Jersey Central Power & Light Company - Incorporated in New Jersey Metropolitan Edison Company - Incorporated in Pennsylvania Pennsylvania Electric Company - Incorporated in Pennsylvania GPU Advanced Resources, Inc. - Incorporated in Delaware GPU Capital, Inc. - Incorporated in Delaware GPU Diversified Holdings, LLC - Incorporated in Delaware GPU Nuclear, Inc. - Incorporated in New Jersey GPU Power, Inc. - Incorporated in Delaware GPU Service, Inc. - Incorporated in Pennsylvania GPU Telecom Services, Inc. - Incorporated in Delaware MYR Group, Inc. - Incorporated in Delaware Statement of Differences ------------------------ Exhibit Number 21, List of Subsidiaries of the Registrant at December 31, 2003, is not included in the printed document.