:Exelon

• Atlantic City Electric is a regulated utility in New Jersey with 545,000 electric customers.
• Baltimore Gas and Electric (BGE) is a regulated utility in Maryland with 1.25 million+ electric customers and 650,000+ natural gas customers.
• Commonwealth Edison (ComEd) is a regulated utility in Illinois with 4 million electric customers.
• Delmarva Power is a regulated utility in Delaware and the Eastern Shore of Maryland with 515,000 electric customers over 5,000 square miles of service territory. They provide natural gas to 130,000 customers in northern Delaware.
• PECO Energy Company (PECO) is regulated utility in eastern Pennsylvania with 1.6 million electric customers and more than 500,000 natural gas customers.
• Pepco (Potomac Electric Power Company) is a regulated utility in Washington, D.C. that serves 842,000 electric customers in the district and parts of Maryland.

Exelon Corporation was created in October 2000 by the merger between PECO Energy Company, formed in 1902, and Unicom Corporation, the parent of Commonwealth Edison, formed in 1907.{{Cite news |url=https://www.forbes.com/forbes/2010/0118/americas-best-company-10-exelon-utility-tax-carbon-windfall.html |title=Exelon's Carbon Advantage |last=Fahey |first=Jonathan |work=Forbes| date=December 31, 2009 }} Unicom was based in Chicago and the city became the headquarters of the new entity. The merger was overseen by the CEO of Unicom, John Rowe, who joined the corporation in 1998 and led the newly formed Exelon until 2012, becoming the nation's longest-serving utility executive.{{Cite news |url=https://www.washingtonpost.com/business/economy/nuclear-giant-exelon-to-buy-washingtons-pepco-in-68-billion-energy-deal/2014/04/30/d7d95fc2-d09e-11e3-9e25-188ebe1fa93b_story.html | title=Things could get better: Nuclear giant Exelon buys Pepco, the energy company DC loves to hate | last1=Flaherty | first1=Mary Pat |last2=Mufson |first2=Steven |last3=Heath |first3=Thomas |newspaper=The Washington Post |date=April 30, 2014 | issn=0190-8286 }}{{Cite news |url=https://www.chicagobusiness.com/article/20120505/ISSUE01/305059976/power-shift-crane-takes-charge-at-exelon |title=Power shift at Exelon |work=Crain Communications |date=May 5, 2012 |url-access=subscription }}

On July 31, 2005, the Federal Energy Regulatory Commission approved the merger of Exelon and Public Service Enterprise Group, a New Jersey utility;{{cite news | url=https://www.hartenergy.com/news/ferc-clears-exelon-pseg-merger-52809 | title=FERC clears Exelon-PSEG merger | work=Hart Energy | date=July 31, 2005}} however, after 18 months, the two companies terminated the agreement due to pressure put on the New Jersey Board of Public Utilities by public interest groups, including New Jersey Citizen Action.{{cite news | url=https://www.wsj.com/articles/SB115827086039263547 | title=Exelon Abandons PSEG Acquisition, Faults New Jersey | first=Rebecca | last=Smith | work=The Wall Street Journal | date=September 15, 2006 | url-access=subscription}}{{Cite news | url=https://www.forbes.com/2006/09/15/exelon-pseg-merger-markets-equity-cx_rs_0915exelon.html | title=No Merger For Exelon And PSEG | work=Forbes | date=September 15, 2006}}

On March 12, 2012, Exelon acquired Constellation Energy, with the combined company owning more than 34 gigawatts of power generation (55% nuclear, 24% natural gas, 8% renewable including hydro, 7% oil and 6% coal).{{Cite news | url=https://www.bizjournals.com/baltimore/news/2012/03/12/constellation-exelon-close-79b-merger.html |title=Constellation, Exelon close $7.9B merger | last=Haber | first=Gary |work=American City Business Journals | date=March 12, 2012 | url-access=subscription}}{{cite news |last=Erman |first=Michael | url=https://www.reuters.com/article/us-constellation-exelon-idUSTRE73Q8BS20110428 |title=Exelon to buy Constellation Energy for $7.9 billion |work=Reuters |date=April 28, 2011 }}

Exelon announced the proposed purchase of Pepco Holdings on April 30, 2014, for $6.8 billion in an all-cash transaction. The merger faced stiff opposition from community groups and D.C. Mayor Muriel Bowser.{{Cite news | url=https://www.baltimoresun.com/business/bs-bz-pepco-exelon-merger-in-doubt-20160301-story.html | title=Renewed opposition to Exelon-Pepco merger threatens to scuttle deal | first=Baltimore | last=Sun | work=Baltimore Sun | date=March 2, 2016 | url-access=limited}} The merger was originally 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.{{cite news |last1=Heath |first1=Thomas |title=Pepco, Exelon to appeal D.C. merger rejection |url=https://www.washingtonpost.com/business/capitalbusiness/pepco-exelon-commit-to-pursuing-merger/2015/08/31/00ae9834-5016-11e5-8c19-0b6825aa4a3a_story.html |newspaper=The Washington Post |date=August 31, 2015}} On March 23, 2016, the merger was finally approved by the District of Columbia Public Service Commission after the company made concessions and the merger was completed, making Exelon the largest regulated utility in the United States by customer count and total revenue.{{Cite news | url=https://www.fox5dc.com/news/exelon-closes-deal-to-buy-pepco-creating-largest-us-utility | title=Exelon closes deal to buy Pepco, creating largest US utility | work=WTTG | date=March 24, 2016}}

On February 2, 2022, Exelon completed the corporate spin-off of Constellation Energy, its energy generation business.{{cite press release | url=https://www.businesswire.com/news/home/20220202005289/en|title=Exelon Completes Separation of Constellation, Moving Forward as Nation's Premier Transmission and Distribution Utility Company | publisher=Business Wire | date=February 2, 2022}} Constellation was the largest operator of nuclear power plants in the United States and the largest non-governmental operator of nuclear power plants in the world. It is also the largest competitive U.S. power generator with approximately 35,500 megawatts of owned capacity. It had full or majority ownership of 23 nuclear reactors in 14 nuclear power plants.{{Cite news |url=https://www.chicagobusiness.com/article/20170316/NEWS11/170319908/exelon-cuts-ceo-chris-crane-s-pay | title=Exelon responds to critics by cutting Crane's pay | work=Crain Communications | date=March 16, 2017 | url-access=subscription}}{{cite web |url=http://epw.senate.gov/public/index.cfm?FuseAction=Files.View&FileStore_id=80f64c95-1286-4fc5-aefd-6afc4e261137 |title=Testimony of John W. Rowe Chairman and Chief Executive Officer Exelon Corporation Before the Committee on Environment and Public Works United States Senate | author=John W. Rowe | publisher=United States Senate |date=October 29, 2009}}

In the 1970s, activists delayed the opening of nuclear power plants by PECO Energy.[https://nvdatabase.swarthmore.edu/content/us-anti-nuclear-activists-partially-block-establishment-nuclear-power-plant-limerick-pa-1977 U.S. Anti-nuclear activists partially block establishment of nuclear power plant in Limerick, PA, 1977–82], Global Nonviolent Action Database, accessed April 6, 2016.

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.{{cite web |url=https://stateimpact.npr.org/pennsylvania/2016/03/24/quaker-group-says-north-philly-solar-panels-could-meet-peco-power-target-this-year/ |title=Quaker group says North Philly solar panels could meet PECO power target this year |work=StateImpact Pennsylvania |access-date=April 7, 2016 }}

In 2005, Exelon was required to pay a $602,000 fine for exceeding the permitted sulfur dioxide emission limit from April to October 2004 at its Cromby Generating Station in Chester County, Pennsylvania.

Exelon and Illinois state officials waited for four years until 2006 before disclosing that Exelon's Braidwood Nuclear Generating Station, a nuclear plant 60 miles southwest of Chicago, had spilled millions of gallons of water containing tritium, a radioactive form of hydrogen, multiple times over a decade. Exelon officials eventually apologized and said the risks from the leak were "minimal", with tritium levels in surrounding wells all found to be below regulatory limits.{{Cite news |url=https://www.chicagotribune.com/news/breaking/chi-us-radiation-leak-at-byron-was-minimal-20120202-story.html |title=U.S.: Radiation leak at Byron was minimal |work=Chicago Tribune |date=February 2, 2012 |url-access=limited }}{{Cite news |url=https://www.chicagotribune.com/business/ct-xpm-2010-03-12-ct-biz-0312-exelon-leak-settlement-20100312-story.html |title=Exelon to pay $1 million to settle suits over leaks at power plants |first=Michael |last=Hawthorne |work=Chicago Tribune |date=March 12, 2010 |url-access=limited }}

In 2009, the Nuclear Regulatory Commission announced its plan for a $65,000 fine against Exelon for permitting its contracted security guards that were guarding its Peach Bottom Nuclear Generating Station, a two-reactor nuclear plant located in Delta, Pennsylvania, to sleep on the job. The incidents did not come to light until a videotape of the security guards was leaked to news media.{{cite web |url=http://pbadupws.nrc.gov/docs/ML0900/ML090060734.pdf |title=Nuclear Regulatory Commission news release |publisher=Nuclear Regulatory Commission }} As a result, Exelon terminated the security contract of the Wackenhut security firm that had been involved and now operates its own in-house nuclear security force.{{Cite news |url=https://www.washingtonpost.com/wp-dyn/content/article/2008/01/03/AR2008010304442.html |title=Video of Sleeping Guards Shakes Nuclear Industry |last=Mufson|first=Steven |newspaper=The Washington Post |date=January 4, 2008 |issn=0190-8286 }}

Exelon makes political contributions via its political action committee (PAC), EXELONPAC. In 2021 and 2022, it contributed $323,500 to federal candidates, including $202,500 to Democrats and $121,000 to Republicans.{{cite web |url=https://www.opensecrets.org/political-action-committees-pacs//C00141218/summary/2022 |title=Exelon Corp |publisher=OpenSecrets }} In 2022, it spent $2,878,000 on lobbying.{{cite web |url=https://www.opensecrets.org/federal-lobbying/clients/summary?id=D000000368 |title=Exelon Corp |publisher=OpenSecrets }}

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{{Finance links

| name = Exelon Corporation

| symbol = EXC

| sec_cik = 1109357

| yahoo = EXC

| google = EXC:NASDAQ

| bloomberg = EXC:US

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Category:2000 establishments in Illinois

Category:Companies based in Chicago

Category:Companies in the Dow Jones Utility Average

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Category:Electric power companies of the United States

Category:Energy companies established in 2000

Category:Hydroelectric power companies of the United States

Category:Natural gas companies of the United States

Category:Nuclear power companies of the United States