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One corporation

Exelon strives to provide superior value for our customers, employees and the communities we serve. We constantly challenge ourselves to become the premier energy company in the nation through environmental leadership, world-class performance and disciplined financial management.

Exelon is the nation’s leading competitive energy provider with the industry’s largest portfolio of electricity generation capacity and nationwide reach. Headquartered in Chicago, Exelon has strong positions in the Midwest and Mid-Atlantic and operates in 47 states, the District of Columbia and Canada.

The Exelon family of companies works to meet the highest standards in all aspects of energy, from generation to competitive energy sales to delivery. The family of companies includes Exelon Generation, Constellation, and delivery companies BGE, ComEd, and PECO. A shared corporate services unit, Exelon Business Services Company, supports the companies.

Chart of the Exelon family of companies.


With strong positions in the Midwest, Mid-Atlantic, Texas and California, Exelon is the largest owner and operator of nuclear plants in the United States and maintains a growing renewable energy development business headquartered in Baltimore.

  • Exelon Generation is the leading competitive power generator in the nation, with owned generating assets as of Dec. 31, 2012 totaling more than 34,700 megawatts. 
  • Exelon Nuclear manages the nation's largest fleet of nuclear plants. 
    The consulting arm of Exelon Nuclear, Exelon Nuclear Partners, advises clients on operational and management model practices to improve nuclear plant operation. (Visit
  • Exelon Power maintains the fossil (natural gas, oil and coal), landfill gas, hydro, wind and solar-powered fleet of generating assets which are located in 10 states and Canada.

Competitive Energy Sales

Through our merger with Constellation, Exelon brings more competition and clean energy supply to more customers.

Constellation provides energy products and services to retail and wholesale customers across 47 states, the District of Columbia and Canada. Constellation helps residential consumers, commercial and industrial businesses, as well as governments and institutions buy, manage and use their energy.  (Visit


Our three utility companies work hard to keep the lights on and the gas flowing for customers in three major urban areas by operating safely, reliably and efficiently.

  • BGE serves more than 1.2 million electric customers and more than 650,000 gas customers in Central Maryland. (Visit
  • ComEd serves northern Illinois, providing electricity to approximately 3.8 million customers (Visit
  • PECO provides electricity to 1.6 million customers and natural gas to more than 500,000 customers in southeastern Pennsylvania. (Visit
Corporate Structure