Energy · Profile from Energy Research Companion
Constellation Energy
The largest owner of nuclear reactors in the United States, spun out of Exelon on 1 February 2022 as a merchant generator whose fleet had been closing plants for want of a price. Within three years the same reactors were treated as scarce assets. Constellation signed a 20-year power purchase agreement (PPA) with Microsoft to restart Three Mile Island Unit 1 as the ~835 MW Crane Clean Energy Center (September 2024), a 20-year deal with Meta for the ~1,121 MW output of Clinton in Illinois (June 2025), and then bought Calpine, the largest US gas-fired generator, for ~$26.6bn including debt (announced January 2025, closed 7 January 2026). By late October 2026 it was the largest US power producer, with ~55 GW of capacity before required divestitures (company, reported). Its main asset is a fleet that runs at capacity factors above 90% and was built and paid for decades ago; its strategy is to sell that firmness under long contracts to buyers who cannot wait for new plants.
At a glance
- Founded
- Exelon formed October 2000 (merger of Unicom/ComEd, Chicago, and PECO Energy, Philadelphia); Constellation Energy Group (Baltimore) merged into Exelon March 2012; Constellation Energy Corporation spun off from Exelon 1 Feb 2022
- Headquarters
- Baltimore, Maryland
- Ownership / structure
- Public, Nasdaq: CEG (from Feb 2022); widely held; joined the S&P 500 on listing (reported); Calpine owned as a business unit (Calpine LLC) from Jan 2026
- Leadership (2026)
- Joseph Dominguez (president and CEO since the spin-off); Dan Eggers (CFO, verify); Robert Lawless (chairman, verify)
- Assets
- ~22 GW of nuclear capacity (company, ~21 reactors at ~13 sites incl. a 44% share of South Texas Project bought from NRG in 2023 — verify count); hydro, wind, solar and gas; from Jan 2026 Calpine's ~26–27 GW of gas and The Geysers geothermal field in California (reported); Crane restart under way (target 2027); retail and wholesale supply business (Constellation brand, ~2 million customers incl. ~three-quarters of Fortune 100 companies on company claims, verify)
- Scale
- ~55 GW total after the Calpine close, before divestitures of ~4.4 GW (LS Power, PJM) and ~606 MW (Texas) (company, reported); 2026 adjusted operating earnings guidance raised to $11.50–12.50 a share (Q2 2026, Aug 2026, company)
- Nuclear output
- US nuclear capacity factor ~90–93% (EIA fleet average); Constellation reports its own fleet at ~94% in typical years (company claim, verify)
- Signature moves (incl. failures)
- Exelon's formation and fleet (2000–2012); Illinois ZECs and the Clinton/Quad Cities rescue (2016); Three Mile Island Unit 1 shutdown (2019); Winter Storm Uri losses (2021); spin-off from Exelon (2022); Microsoft–Crane restart PPA (2024); the PJM co-location complaint and FERC order (2024–25); Meta–Clinton PPA and licence renewals (2025); the Calpine acquisition (2025–26)
9 strategic moves analysed
Each one gets a full strategy file in the companion: context, the decision, the financing, what happened, and the lesson.
2000
Exelon Formation and the Nuclear Fleet
Acquisition or merger
2016
Illinois ZECs and the Clinton Quad Cities Rescue
Regulatory or legal action / state support
2019
Three Mile Island Unit 1 Shutdown
Closure / failure
2021
Winter Storm Uri Losses
Accident or disaster / failure
2022
Exelon Spin Off
Spin-off or IPO
2024
Co Location Complaint and the FERC Order
Regulatory or legal action
2024
Microsoft Crane Restart PPA
Offtake or supply contract / restart
2025
Calpine Acquisition
Acquisition or merger
2025
Meta Clinton PPA and Licence Renewals
Offtake or supply contract / licensing