The company's trademarked slogan, as of 2003, is "We're connected to you by more than power lines."
Pepco was founded in the late 19th Century as a subsidiary of the Washington Traction and Electric Company, one of the private streetcar companies in Washington. Surplus power was then sold to other electric streetcar companies and to cable car companies so that they could convert to electricity. Later, the power was also sold to business and residential customers. The Public Utility Holding Company Act of 1935 forced the North American Company, the holding company, to sell the streetcar business and operate just the public utility.
In 2001, the company was reorganized and became a unit of Pepco Holdings, Inc.