# Constellation Energy

> Constellation Energy is the largest producer of carbon-free electricity in the United States, built around the country's biggest fleet of nuclear reactors plus hydro, wind and solar. Spun out of Exelon in 2022, the Baltimore company sells power and energy-management services to homes, businesses, governments and three-quarters of the Fortune 100 - and it is now restarting a shuttered unit at Three Mile Island to feed Microsoft's AI data centers.

- **Founded:** 2022
- **Headquarters:** Baltimore, Maryland, United States
- **Founders:** Joseph Dominguez (President & CEO), Daniel Eggers (CFO)
- **Team size:** ~16,000 employees (pre-Calpine); larger following the January 2026 Calpine acquisition
- **Products:** Nuclear generation, Retail electricity & natural gas, Wholesale power & energy trading, 24/7 carbon-free matching & PPAs, Energy management & sustainability services
- **Notable:** Largest producer of carbon-free electricity in the United States, Operates the nation's largest nuclear generation fleet, output nearly 90% carbon-free, Generation capacity able to power the equivalent of ~15 million homes; ~10% of US clean energy

## Products & services

- **Nuclear generation** — The largest nuclear fleet in the United States, the carbon-free backbone of the company's generation portfolio.
- **Retail electricity & natural gas** — Competitive power and gas supply for residential, commercial, industrial and public-sector customers in deregulated markets.
- **Wholesale power & energy trading** — Sale of electricity into wholesale markets and management of a large generation and trading portfolio.
- **24/7 carbon-free matching & PPAs** — Hourly clean-energy matching and long-term power purchase agreements, including the 20-year Microsoft PPA tied to the Crane Clean Energy Center.
- **Energy management & sustainability services** — Energy efficiency, on- and off-site clean energy and storage, GHG monitoring and reporting, and decarbonization consulting.
- **Constellation Offsite Renewables (CORe / CORe+)** — Structured renewable products that let customers claim renewable energy without on-site installation.

## Achievements

- Largest producer of carbon-free electricity in the United States
- Operates the nation's largest nuclear generation fleet, output nearly 90% carbon-free
- Generation capacity able to power the equivalent of ~15 million homes; ~10% of US clean energy
- Announced restart of Three Mile Island Unit 1 (Crane Clean Energy Center) via a 20-year Microsoft PPA
- Completed the $16.4B acquisition of Calpine in January 2026 to become the largest US power generator
- Reported roughly $25.5 billion in annual revenue

## Latest updates

- **2026-01** — Completed the $16.4 billion acquisition of Calpine, becoming the largest power generator in the United States with roughly 60 GW of capacity.
- **2025-07** — FERC approved the Constellation-Calpine merger, subject to market-power conditions in PJM.
- **2025-01** — Announced the agreement to acquire Calpine at an equity purchase price of $16.4 billion.
- **2024-09** — Announced restart of Three Mile Island Unit 1, renamed the Crane Clean Energy Center, under a 20-year power purchase agreement with Microsoft; targeted 2028 return to service.

## Links

- Website: https://constellationenergy.com
- LinkedIn: http://www.linkedin.com/company/constellation-energy
- Twitter/X: https://twitter.com/ConstellationEG
- Facebook: https://www.facebook.com/ConstellationEnergy

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Profile page: https://yespress.io/constellation
Published by YesPress — https://yespress.io
Last updated: 2026-08-14