Leading US energy provider serving over 10 million customers. Exelon Corporation is a Fortune 200 American public utility headquartered in Chicago, Illinois. Established in 2000 by the merger of PECO Energy Company and Unicom Corporation, Exelon is one of the largest regulated electric utilities in the United States. The company serves more than 10 million customers through its six regulated subsidiaries: Commonwealth Edison (Illinois), PECO (Pennsylvania), Baltimore Gas and Electric (Maryland), Atlantic City Electric (New Jersey), Delmarva Power (Delaware/Maryland), and Pepco (Washington, D.C./Maryland). Exelon employs approximately 20,000 people as of 2024. The company is recognized for its commitment to delivering reliable electricity and natural gas services, operational excellence, community engagement, and customer service. Exelon’s recent financial reports indicate strong performance, keeping it among the top publicly traded utility companies in the U.S.