Business: Exelon Corp. is a FORTUNE 100 company that work's in every stage of the energy business: power generation, competitive energy sales, transmission and delivery. As the nation's leading competitive energy provider, Exelon does business in 48 states, D.C., and Canada. Exelon's family of companies represents every stage of the energy value chain. Exelon’s six utilities deliver electricity and natural gas to 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. Exelon Generation is one of the largest competitive U.S. power generators and has nuclear, gas, wind, solar and hydroelectric generating capacity comprising one of the nation's cleanest, lowest-cost power generation fleets. And Constellation provides energy products and services to residential, public sector and business customers.