Johnsonville Dam
Hydro power plant · Rensselaer County, New York
Nameplate capacity
4.0 MW
Rank in New York
#645
of 1,152 plants
In service since
2009
January 2009
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Erie Boulevard Hydropower LP
- County
- Rensselaer County
- Generating units
- 2
- Share of state capacity
- 0.01%
- Rank among hydro plants in New York
- #87 of 165
- EIA plant code
- 2580
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 2.0 MW | 1.1 MW | 2009 | Operating |
| 2 | Conventional Hydroelectric | 2.0 MW | 1.4 MW | 2009 | Out of service but expected to return to service in next calendar year |
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
| Glenmere Lake | Battery storage | 4.0 MW |
| Hunt Creek | Solar | 4.0 MW |
| Johnstown Solar 1, LLC | Solar | 4.0 MW |
| Mechanicville Hydroelectric Station | Hydro | 4.0 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 4.0 MW solar plant and a 4.0 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