Exelon Corporation, headquartered in Chicago, is one of the largest energy providers in the United States. Formed in 2000 through the merger of PECO Energy Company and Unicom Corporation, Exelon has grown its operations to encompass both energy generation and regulated utility services. The company’s integrated structure allows it to address the full spectrum of energy needs, from power production to delivery and customer engagement.
Through its competitive energy supply business, now operating under the Constellation brand, Exelon maintains a diverse generation portfolio that includes nuclear, natural gas, hydroelectric and renewable energy sources. The company is especially notable for its nuclear fleet, which stands among the nation’s largest in terms of capacity and output. This generation mix supports Exelon’s commitment to low-carbon energy production and positions the company to play a central role in advancing sustainable electricity markets.
On the distribution side, Exelon serves millions of residential, commercial and industrial customers across six regulated utility subsidiaries: Commonwealth Edison in Illinois, PECO Energy in Pennsylvania, Baltimore Gas and Electric in Maryland, Delmarva Power & Light in Delaware and Maryland, Atlantic City Electric in New Jersey, and Pepco in the District of Columbia and Maryland. These utilities manage the transmission and delivery infrastructure that ensures reliable power and natural gas service, investing in grid modernization and customer service innovations to enhance system resilience.
Under the leadership of President and Chief Executive Officer Christopher M. Crane, Exelon continues to pursue strategic initiatives aimed at decarbonizing the energy sector, improving grid reliability and expanding customer-focused offerings. The company engages with regulators, policymakers and community stakeholders to support clean energy legislation and to develop programs that foster economic growth in the regions it serves. Exelon’s integrated model and focus on innovation underscore its role as a leading player in the evolving U.S. energy landscape.