Pepco, a subsidiary of Pepco Holdings, provides electric service s to more than 750,000 residential and commercial customers in Washington, D.C., and Montgomery and Prince George's counties in Maryland. Its parent company, Pepco Holdings, operates power delivery and competitive energy businesses through its subsidiaries in the United States. The parent company s power delivery business consists primarily of the transmission, distribution and supply of electric power. Pepco Holdings conducts its power delivery business through its regulated utility subsidiaries that include Potomac Electric Power Company, Delmarva Power & Light Company and Atlantic City Electric Company. The parent company provides generation, marketing and supply of electricity and gas, as well as related energy management services, primarily in the mid-Atlantic region. Pepco Holdings operations are conducted through Conectiv Energy Holding Company and Pepco Energy Services..