Power plants operated by National Grid Generation LLC
National Grid Generation LLC operates 12 power plants in the 2025 EIA-860 data, with 3,945 MW of nameplate capacity, the 65th-largest fleet among the 5,826 operators on file. All of them are in New York. Natural gas is 71% of the capacity; the largest site is Northport. Its oldest working unit dates from 1956, at E F Barrett.
- Natural gas2,805 MW71%
- Oil and petroleum1,140 MW29%
Capacity by decade it came online
Natural gasOil and petroleum
Above the line: capacity operating in 2025. Below: capacity retired at these plants.
Plants
| Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|
| Northport | New York | Natural gas | 1,564 MW | 1967 |
| E F Barrett | New York | Natural gas | 669 MW | 1956 |
| Holtsville | New York | Oil and petroleum | 567 MW | 1974 |
| Port Jefferson | New York | Natural gas | 498 MW | 1958 |
| Wading River | New York | Oil and petroleum | 238 MW | 1989 |
| Glenwood Landing | New York | Natural gas | 122 MW | 1967 |
| Glenwood | New York | Oil and petroleum | 110 MW | 1972 |
| Shoreham | New York | Oil and petroleum | 71.5 MW | 1966 |
| West Babylon | New York | Oil and petroleum | 52.4 MW | 1971 |
| East Hampton | New York | Oil and petroleum | 27.3 MW | 1962 |
| Southold | New York | Oil and petroleum | 14 MW | 1964 |
| South Hampton | New York | Oil and petroleum | 11.5 MW | 1963 |