Exelon Corporation
Traded as
FoundedOctober 20, 2000; 18 years ago (2000-10-20)
(Merger of PECO Energy Company and Unicom Corp)
Key people
Christopher Crane
(President and CEO)
ProductsElectrical power
Natural gas
ServicesElectricity and natural gas distribution
RevenueIncrease US$33.531 billion (2017)[1]
Increase US$4.260 billion (2017)[1]
Increase US$3.770 billion (2017)[1]
Total assetsIncrease US$116.700 billion (2017)[1]
Total equityIncrease US$32.132 billion (2017)[1]
Number of employees
34,621 (December 2017)[1]
Chase Tower, the location of the headquarters of Exelon

Exelon Corporation is an American Fortune 100 energy company headquartered in Chicago, Illinois. It generates revenues of approximately $33.5 billion and employs approximately 34,000 people.[2] Exelon is the largest electric parent company in the United States by revenue, the largest regulated utility in the United States with approximately 10 million customers, and also the largest operator of nuclear power plants in the United States.[3] It was created in October 2000 by the merger of PECO Energy Company of Philadelphia and Unicom Corp of Chicago, which owned Commonwealth Edison.[4]

Exelon operates regulated utilities in Illinois, Pennsylvania, Maryland, Delaware, New Jersey, and Washington, DC. In October 2009, Exelon had full or majority ownership of 23 nuclear reactors in 14 nuclear power plants.[5][6] Exelon has operations and business activities in 48 states, the District of Columbia and Canada, and is the largest competitive U.S. power generator with approximately 35,500 megawatts of owned capacity.[2][7] Exelon merged with Constellation Energy Group in March 2012 and acquired Pepco Holdings in March 2016.[8][9] Exelon consists of eight main operating subsidiaries with Exelon Generation, a deregulated energy generator, Constellation Energy Group, a deregulated competitive energy supplier, and six regulated utilities, Commonwealth Edison (Illinois), PECO Energy Company (Pennsylvania), Baltimore Gas and Electric (Maryland), Delmarva Power & Light (Delaware and Maryland), Atlantic City Electric (New Jersey), and Potomac Electric Power Company (Washington, DC and Maryland).[3][10]


Exelon Corporation was created as the result of a merger between PECO Energy Company and the Unicom Corporation in October 2000.[4] Unicom was based in Chicago and the city became the home of the new entity.[11] The merger was overseen by the CEO of Unicom, John Rowe who joined the corporation in 1998 and went on to lead the newly-formed Exelon until 2012, becoming the nation's longest-serving utility executive.[12][4][13]

Under Rowe, Exelon explored a number of mergers and acquisitions. On June 30, 2005, the Federal Energy Regulatory Commission approved the merger of Exelon and Public Service Enterprise Group Inc., a New Jersey utility. Under this merger, Exelon would have become the largest utility in the United States.[14] The two companies later broke off the agreement[15] due to pressure put on the NJ Board of Public Utilities by public interest groups, including New Jersey Citizen Action.[16] The merger sat pending in front of the NJBPU for nineteen months before Exelon concluded that they were fighting a losing battle.[15] On April 28, 2011, Exelon announced a merger with Constellation Energy for $7.9 billion with the combined company owning more than 34 gigawatts of power generation (55 percent nuclear, 24 percent natural gas, 8 percent renewable including hydro, 7 percent oil and 6 percent coal).[17][18] The merger was completed on March 12, 2012.[19]

In 2012, when announcing the cancellation of new nuclear construction for Victoria County Station, Texas, Exelon stated that economic and market conditions, especially low natural gas prices, made the "construction of new merchant nuclear power plants in competitive markets uneconomical now and for the foreseeable future".[20]

In 2008, Christopher Crane was named CEO following Rowe's retirement and the completion of the merger with Constellation Energy.[21][13] Exelon announced the proposed purchase of Pepco Holdings, Inc on April 30, 2014, for $6.8 billion in an all-cash transaction. The merger was rejected by the District of Columbia Public Service Commission in August 2015, though it was approved by other federal and state regulators. The companies appealed the decision.[22] On March 23, 2016, the merger was approved by the Washington DC Public Service Commission, under a revised set of terms. The merger was completed later that day making Exelon the largest regulated utility in the United States by customer count and total revenue.[23]


PECO Energy, one of Exelon's local power companies, has been involved in two controversies with activists. In the 1970s, activists delayed the opening of nuclear power plants.[24] In 2015, Earth Quaker Action Team began a campaign to pressure PECO to expand the solar power it purchases, and to purchase it locally to create jobs.[25]

Exelon's merger with Pepco faced stiff opposition from community groups and the D.C. Mayor Muriel Bowser.[26]

Other Languages
Deutsch: Exelon
فارسی: اکسلان
français: Exelon
Bahasa Indonesia: Exelon
日本語: エクセロン