| Pepco Holdings, Inc. (PHI) is a holding company that, through regulated public utility subsidiaries, is engaged in the transmission, distribution and default supply of electricity and the distribution and supply of natural gas (Power Delivery): Potomac Electric Power Company (Pepco), Delmarva Power & Light Company (DPL) and Atlantic City Electric Company (ACE). Through Pepco Energy Services, Inc. and its subsidiaries (collectively Pepco Energy Services), PHI also provides energy efficiency and renewable energy services to government and institutional customers. As of December 31, 2010, the Company operated in three segments: Power Delivery, consisting of the operations of Pepco, DPL and ACE; Pepco Energy Services and Other Non-Regulated, consisting of the operations of PCI. On July 1, 2010, PHI completed the sale of Conectiv Energy Holding Company's (Conectiv Energy) wholesale power generation business to Calpine Corporation (Calpine). |