Exelon's family of companies represents every stage of the energy value chain. Exelon Generation is one of the largest competitive United States power generators, with approximately 32,700 megawatts of owned capacity comprising one of the nation's cleanest, lowest-cost power generation fleets. Constellation provides energy products and services to approximately 2 million residential, public sector and business customers, including more than two-thirds of the Fortune 100. And Exelon’s six utilities deliver electricity and natural gas to approximately 10 million customers in Delaware, the District of Columbia, Illinois, Maryland, New Jersey and Pennsylvania through its Atlantic City Electric, BGE, ComEd, Delmarva Power, PECO and Pepco subsidiaries.