Nine Mile Point Nuclear Station
Nuclear power plant · Oswego County, New York
Nameplate capacity
1,901 MW
Rank in New York
#3
of 1,152 plants
In service since
1969
December 1969
Details
- Primary fuel
- Nuclear
- Technology
- Nuclear
- Operator
- Constellation Nuclear
- County
- Oswego County
- Generating units
- 2
- Share of state capacity
- 4.25%
- Rank among nuclear plants in New York
- #1 of 3
- EIA plant code
- 2589
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 2 | Nuclear | 1,259 MW | 1,275 MW | 1987 | Operating |
| 1 | Nuclear | 642 MW | 621 MW | 1969 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in New York
| Robert Moses Niagara | Hydro | 2,429 MW |
| Ravenswood | Natural gas | 2,096 MW |
| Oswego Harbor Power | Other | 1,804 MW |
| Northport | Natural gas | 1,564 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 1,901 MW solar plant and a 1,901 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All New York power plants · What New York actually generates