Exhibit 21 Subsidiaries of the Registrants Subsidiaries of Atlantic Energy, Inc.: State of Date of Company Name Incorporation Incorporation Atlantic City Electric Company New Jersey 4/28/24 Atlantic Energy International, Inc. Delaware 7/6/96 Atlantic Energy Enterprises, Inc. New Jersey 1/3/95 Subsidiaries of Atlantic City Electric Company: State of Date of Company Name Incorporation Incorporation Deepwater Operating Company New Jersey 12/17/29 Atlantic Capital I Delaware 6/20/96 (Grantor Trust)