Stephentown Spindle
Battery storage power plant · Rensselaer County, New York
Details
- Primary fuel
- Battery storage
- Technology
- Flywheels
- Operator
- Convergent Energy and Power LP
- County
- Rensselaer County
- Generating units
- 1
- Share of state capacity
- 0.04%
- Rank among battery storage plants in New York
- #4 of 32
- EIA plant code
- 57710
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| SRS1 | Flywheels | 20 MW | 20 MW | 2011 | 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
| Riverhead Solar Farm | Solar | 20 MW |
| Steel Winds Wind Farm | Wind | 20 MW |
| Willis Battery Storage | Battery storage | 20 MW |
| Prospect | Hydro | 19 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 20 MW solar plant and a 20 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