Exelon Energy is now a part of Constellation.
Exelon is the leading U.S. competitive energy provider, with one of the cleanest and lowest-cost power generation fleets and largest retail customer bases in the country. The Exelon family of companies participates in every stage of the energy business, from generation to power sales to transmission to delivery. Headquartered in Chicago, the company has operations and business activities in 47 states, the District of Columbia and Canada. Exelon has approximately $33 billion in annual revenues and trades on the NYSE under the ticker symbol EXC.