Parent company profile

Constellation Energy

Constellation Energy operates 46 U.S. generating facilities through 6 reported operators, with a combined nameplate capacity of 37.83 GW. The largest share of capacity is nuclear (64%), spread across 8 states.

Ownership reflects the utility or operator reported to EIA (Form EIA-860); equity ownership of individual facilities may differ. The grouping of operators into this parent company is curated by GridAlmanac from public corporate-ownership records.

46
Plants
37.83 GW
Total capacity
6
Subsidiaries
8
States

Capacity mix

Nuclear 64.4%Natural Gas 26.4%Oil 4.7%Hydroelectric 4.2%Waste 0.2%Biomass 0.1%Solar 0.0%

Operating subsidiaries

Constellation Nuclear14 · 24.35 GWConstellation Power, Inc23 · 9.39 GWConstellation Mystic Power LLC1 · 2.84 GWConstellation Power Source Generation, LLC6 · 1.20 GW

2 smaller reported operators are included in the totals and plant list below but do not have their own operator pages.

By state

California1 · 33 MWIllinois7 · 12.82 GWMaryland9 · 3.60 GWMassachusetts7 · 4.05 GWNew Jersey1 · 550 MWNew York3 · 3.40 GWPennsylvania15 · 9.60 GWTexas3 · 3.78 GW

Operating plants

PlantFuelStateOwnerCapacity
Peach BottomNuclearPennsylvaniaConstellation Nuclear2.88 GW
Braidwood Generation StationNuclearIllinoisConstellation Nuclear2.45 GW
Byron Generating StationNuclearIllinoisConstellation Nuclear2.45 GW
LaSalle Generating StationNuclearIllinoisConstellation Nuclear2.34 GW
LimerickNuclearPennsylvaniaConstellation Nuclear2.28 GW
Dresden Generating StationNuclearIllinoisConstellation Nuclear2.02 GW
Quad Cities Generating StationNuclearIllinoisConstellation Nuclear2.02 GW
Nine Mile Point Nuclear StationNuclearNew YorkConstellation Nuclear1.90 GW
Calvert Cliffs Nuclear Power PlantNuclearMarylandConstellation Nuclear1.85 GW
HandleyNatural GasTexasConstellation Power, Inc1.31 GW
Wolf Hollow IINatural GasTexasConstellation Power, Inc1.23 GW
Colorado Bend IINatural GasTexasConstellation Power, Inc1.23 GW
Clinton Power StationNuclearIllinoisConstellation Nuclear1.14 GW
Muddy RunHydroelectricPennsylvaniaConstellation Power, Inc1.07 GW
Crane Clean Energy CenterNuclearPennsylvaniaConstellation Nuclear980.8 MW
James A FitzpatrickNuclearNew YorkConstellation Nuclear883.3 MW
Eddystone Generating StationNatural GasPennsylvaniaConstellation Power, Inc861.6 MW
R E Ginna Nuclear Power PlantNuclearNew YorkConstellation Nuclear614 MW
Croydon CT Generating StationOilPennsylvaniaConstellation Power, Inc546.4 MW
ConowingoHydroelectricMarylandConstellation Power, Inc530.8 MW
PerrymanNatural GasMarylandConstellation Power Source Generation, LLC492.3 MW
Exelon West Medway II LLCNatural GasMassachusettsConstellation Power, Inc263.6 MW
Exelon Medway LLCOilMassachusettsConstellation Power, Inc135 MW
Richmond Generating StationOilPennsylvaniaConstellation Power, Inc131.6 MW
PhiladelphiaOilMarylandConstellation Power Source Generation, LLC82.8 MW
Delaware Generating StationOilPennsylvaniaConstellation Power, Inc77 MW
SouthwarkOilPennsylvaniaConstellation Power, Inc74.4 MW
FallsOilPennsylvaniaConstellation Power, Inc63.6 MW
Moser Generating StationOilPennsylvaniaConstellation Power, Inc63.6 MW
Chester Generating StationOilPennsylvaniaConstellation Power, Inc55.8 MW
Exelon Framingham LLCOilMassachusettsConstellation Power, Inc42.6 MW
Schuylkill Generating StationOilPennsylvaniaConstellation Power, Inc39.8 MW
Hyperion Treatment Plant CHP PlantBiomassCaliforniaConstellation New Energy Inc.33 MW
Mount Saint Mary'sSolarMarylandConstellation Solar Horizons LLC13.7 MW
Retired plants (12)
PlantFuelStateOwnerCapacity
Mystic Generating Stationretired 2024Natural GasMassachusettsConstellation Mystic Power LLC2.84 GW
New Boston Generating Stationretired 2007Natural GasMassachusettsConstellation Power, Inc717.7 MW
Oyster Creekretired 2018NuclearNew JerseyConstellation Nuclear550 MW
Cromby Generating Stationretired 2011OilPennsylvaniaConstellation Power, Inc420.2 MW
Southeast Chicago Energy Projectretired 2024Natural GasIllinoisConstellation Power, Inc407.2 MW
Riverside (MD)retired 2019Natural GasMarylandConstellation Power Source Generation, LLC257.2 MW
Notch Cliffretired 2020Natural GasMarylandConstellation Power Source Generation, LLC144 MW
Westportretired 2020Natural GasMarylandConstellation Power Source Generation, LLC121.5 MW
Gould Streetretired 2019Natural GasMarylandConstellation Power Source Generation, LLC103.5 MW
Fairless Hillsretired 2020WastePennsylvaniaConstellation Power, Inc60 MW
Exelon Edgar LLCretired 2001OilMassachusettsConstellation Power, Inc28.4 MW
Exelon L Streetretired 2016OilMassachusettsConstellation Power, Inc18.6 MW

See the full operator directory under owners & operators.