Grahamsville
Hydro power plant · Sullivan County, New York
Nameplate capacity
18 MW
Rank in New York
#172
of 1,152 plants
In service since
1956
January 1956
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- New York Power Authority
- County
- Sullivan County
- Generating units
- 1
- Share of state capacity
- 0.04%
- Rank among hydro plants in New York
- #24 of 165
- EIA plant code
- 2627
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GRHM | Conventional Hydroelectric | 18 MW | 18 MW | 1956 | 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
| Montefieor Medical Center Moses Division | Natural gas | 19 MW |
| Ellis Solar | Solar | 18 MW |
| Seneca Energy | Other | 18 MW |
| The Mount Sinai Hospital | Other | 18 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 18 MW solar plant and a 18 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