Unionville Hydro Project 2499 NY
Hydro power plant · St Lawrence County, New York
Nameplate capacity
3.0 MW
Rank in New York
#775
of 1,152 plants
In service since
1984
July 1984
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Erie Boulevard Hydropower LP
- County
- St Lawrence County
- Generating units
- 1
- Share of state capacity
- 0.01%
- Rank among hydro plants in New York
- #114 of 165
- EIA plant code
- 50269
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| HY1 | Conventional Hydroelectric | 3.0 MW | 2.2 MW | 1984 | 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
| SL JAMESTOWN ARRAY 1 | Solar | 3.0 MW |
| Sissonville Hydro | Hydro | 3.0 MW |
| Wedge NY | Solar | 3.0 MW |
| Copenhagen Solar | Solar | 2.9 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 3.0 MW solar plant and a 3.0 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