Delmarva Power is a public utility and a wholly owned subsidiary of Pepco Holdings, which provides a range of energy transmission and delivery services to more than 500,000 customers in Delaware and Delmarva Peninsula and over 120,000 natural gas delivery customers in northern Delaware. Its parent company, Pepco Holdings, also known as PHI, is one of the leading energy delivery companies in the mid-Atlantic region. PHI is an energy holding company that specializes in regulated utility operations and in the sales of energy products. It serves nearly 1.5 million residential and commercial customers. Pepco Holdings family of energy-related businesses includes Atlantic City Electric, Pepco, Conectiv Energy and Pepco Energy Services.