Exelon's Power Team is now a part of Constellation. Exelon is the leading U.S. competitive energy provider, with one of the c ... leanest 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. Constellation is Exelon’s competitive retail and wholesale energy business. Constellation and its subsidiary brands provide an array of innovative energy products and services to customers across the United States and in the Canadian provinces of Alberta, British Columbia and Ontario. Headquartered in Baltimore, Constellation serves approximately 100,000 business and public sector customers, including two-thirds of the FORTUNE 100, and approximately 1 million residential customers. read more