Power plants operated by Constellation Nuclear
Constellation Nuclear operates 13 power plants in the 2025 EIA-860 data, with 23.8 GW of nameplate capacity, the third-largest fleet among the 5,826 operators on file. They are spread over four states: Illinois, Pennsylvania, New York and Maryland. Nuclear is 100% of the capacity; the largest site is Peach Bottom. Its oldest working unit dates from 1969, at Nine Mile Point Nuclear Station.
- Nuclear23,798 MW100%
Capacity by decade it came online
Nuclear
Above the line: capacity operating in 2025. Below: capacity retired at these plants.
Plants
| Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|
| Peach Bottom | Pennsylvania | Nuclear | 2,876 MW | 1974 |
| Braidwood Generation Station | Illinois | Nuclear | 2,450 MW | 1988 |
| Byron Generating Station | Illinois | Nuclear | 2,450 MW | 1985 |
| LaSalle Generating Station | Illinois | Nuclear | 2,340 MW | 1984 |
| Limerick | Pennsylvania | Nuclear | 2,277 MW | 1986 |
| Dresden Generating Station | Illinois | Nuclear | 2,019 MW | 1970 |
| Quad Cities Generating Station | Illinois | Nuclear | 2,019 MW | 1972 |
| Nine Mile Point Nuclear Station | New York | Nuclear | 1,901 MW | 1969 |
| Calvert Cliffs Nuclear Power Plant | Maryland | Nuclear | 1,850 MW | 1975 |
| Clinton Power Station | Illinois | Nuclear | 1,138 MW | 1987 |
| Crane Clean Energy Center | Pennsylvania | Nuclear | 981 MW | 1974 |
| James A Fitzpatrick | New York | Nuclear | 883 MW | 1976 |
| R E Ginna Nuclear Power Plant | New York | Nuclear | 614 MW | 1970 |