Exelon Corp. is a utility services holding company, which engages in 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 and Light Company (DPL), and Atlantic City Electric Company (ACE). The company was founded on February 4, 1999 and is headquartered in Chicago, IL.