The Potomac Electric Power Company (PEPCO) is an American utility company that supplies electric power to the city of Washington, D.C., and to surrounding communities in Maryland. It is owned by Exelon.

The company's current trademarked slogan is "Your life. Plugged in." Its former slogan was "We're connected to you by more than power lines."

Pepco's bulk transmission system consists of transmission lines operating at 115 kV, 138kV, 230 kV and 500 kV. Pepco has interconnections with Potomac Edison (230kV, 500kV), Baltimore Gas and Electric (500kV, 230kV, 115kV), and Dominion Virginia Power (500kV, 230kV).

The company's predecessor, Potomac Electric Co., was organized in 1891 to provide street lighting and streetcar power in Georgetown and Northwest D.C. After suffering during the Panic of 1893, the company filed bankruptcy and, on November 6, 1895, was acquired by Oscar T. Crosby and Charles A. Lieb for $5,500.

The company was incorporated as Potomac Electric Power Company on April 28, 1896 in Virginia. It became a subsidiary of the North American Company, which owned the Washington Traction and Electric Company, one of the private streetcar companies in Washington.

On December 17, 1896, after a court battle, the company received a contract to light the city of Washington, D.C.

In January 1889, the company merged with its rival, United States Electric Lighting Company.

In 1899, the company merged with Washington Traction and Electric Company.