Exelon Corp. is a utility services holding company, which engages in the energy distribution and transmission businesses. It operates through the following segments: Commonwealth Edison Company (ComEd), PECO Energy Company (PECO), Baltimore Gas and Electric Company (BGE), Potomac Electric Power Company (Pepco), Delmarva Power & Light Company (DPL), and Atlantic City Electric Company (ACE). The company was founded in February 1999 and is headquartered in Chicago, IL.