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US utility Commonwealth Edison (ComEd – part of Exelon) and Constellation have announced an agreement that will help ComEd power all of its 54 offices and metered facilities with locally produced carbon-free nuclear energy, every hour of every day. This will make ComEd the first US investor-owned utility to power its facilities with 100% clean energy produced at the same time and place it is consumed. The ComEd agreement follows a similar one between Constellation and Microsoft in July to power one of its Virginia data centres.

Date: Wednesday, 20 September 2023
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The hourly carbon-free energy matching agreement will see ComEd power all its offices and metered facilities with locally produced nuclear energy, in a 'first' for an investor-owned US utility. Constellation earlier this year signed a similar hourly energy matching agreement to power a Microsoft data centre.

Date: Saturday, 16 September 2023
Original article:,-ComEd-in-landmark-energy-matching-d

Dutch nuclear energy development company ULC-Energy BV has signed a Memorandum of Understanding (MoU) with US utility Constellation to support the deployment of a fleet of Rolls-Royce small modular reactors (SMRs) in the Netherlands.

Date: Friday, 16 September 2022
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Constellation is collaborating with Microsoft on the development of an energy matching technology to match a customer's power needs with local carbon-free energy sources. The real-time, data-driven carbon accounting solution will use hour-by-hour regional tracking giving customers clearer and more accurate data on their emissions impact and help to achieve zero-carbon goals, the company said.

Date: Wednesday, 09 March 2022
Original article:,-Microsoft-in-clean-energy-collabora

Company operates largest nuclear fleet in country The company owns and operates 21 nuclear reactors and has an operating interest in Salem-1 and Salem-2. Constellation, formerly Exelon Generation, owner and operator of America’s largest commercial nuclear reactor fleet, announced the completion of its separation from Exelon Corporation and its launch as a standalone, publicly traded company.

The new company, based in Baltimore, Maryland, began trading this week on the Nasdaq Global Select Market under the symbol “CEG.”

Exelon announced last February that it had begun work to separate its utility businesses from its competitive power generation and customer-facing energy businesses.

In a press release announcing the separation, Constellation said it is exploring growth opportunities that build on its core businesses and capitalise on the expanding demand for carbon-free energy, including potential acquisition of nuclear plants or other clean energy assets, creating clean hydrogen using its nuclear fleet, and introducing new products and services for business customers.

Date: Saturday, 05 February 2022
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The two companies that will emerge from the approaching separation of Exelon Generation's regulated utility and competitive energy businesses have set out their respective plans at separate analyst events this week. Exelon will become the USA's largest transmission and distribution (T&D) utility serving some 10 million customers across seven different regulatory jurisdictions. Constellation will be the largest producer of carbon-free electricity in the country.

Date: Thursday, 13 January 2022
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Exelon Generation has announced plans for more than USD300 million-worth of capital projects at its Byron and Dresden plants, and hiring 650 employees, following the state of Illinois's passage of clean energy legislation. Separately, the company has today announced the senior leadership of the two businesses that will result from the separation of its regulated utility and competitive energy businesses. The regulated business is to be called Exelon and the competitive business Constellation.

Date: Saturday, 02 October 2021
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A clean energy bill, Senate Bill 2408, which includes a plan to prevent closure of the Byron NPP was adopted by the Illinois House of Representatives on 9 September after hours of debate by 83 votes to 33.

Date: Tuesday, 14 September 2021
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Chicago-based Exelon on 16 June notified the PJM electricity transmission organisation that it plans to take the two units of the Byron NPP offline in September. PJM is a regional transmission organisation that coordinates the movement of wholesale electricity in all or parts of 13 US states, including Illinois, and the District of Columbia.

Date: Tuesday, 22 June 2021
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US power company Exelon announced on 24 February that its Board of Directors had approved a plan to separate Exelon Utilities (RemainCo), comprising the company’s six regulated electric and gas utilities, and Exelon Generation (SpinCo), its competitive power generation and customer-facing energy businesses, “into two publicly traded companies with the resources necessary to best serve customers and sustain long-term investment and operating excellence”. 

Date: Wednesday, 03 March 2021
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