Exelon Corp. is a leading competitive energy provider, with operations and business activities in the U.S. and Canada and headquarters in Chicago. The company has more than 31,000 megawatts of owned capacity, comprising one of the nation's cleanest and lowest-cost power generation fleets. Constellation is Exelon's competitive retail and wholesale energy business, which provides energy products and services to more than 2 million residential, business and public sector customers. Exelon's regulated utilities deli