FirstEnergy Corp. formed through merger of Ohio Edison Co. and Centerior Energy Corp.

• Holding company for Ohio Edison (and subsidiary Pennsylvania Power Co.), The Cleveland Electric Illuminating Co., The Toledo Edison Co.
• 11th largest investor-owned electric system in the U.S.: annual electric sales of 64 billion kilowatt-hours; total assets nearly $20 billion; 10,000 employees; 2.2 million customers; 13,200 square miles of northern and central Ohio and western Pennsylvania; 12,000 MW  generating capacity.

2001:

FirstEnergy merges with GPU Inc.

• Nearly doubled revenue (more than $12 billion) and customers served (4.3 million).
• GPU acquisition adds 2.1 million customers in a 24,000 square-mile service area in Pennsylvania and New Jersey (Metropolitan Edison Co.; Pennsylvania Electric Co., Jersey Central Power & Light Co.)

2011:

FirstEnergy merges with Allegheny Energy (1.6 million customers in Pennsylvania, West Virginia, Maryland and Virginia).

• More than doubled supercritical coal capacity “and provided opportunities for the company to grow and expand into new markets with a stronger, more focused competitive operation.”