# Stephentown Spindle

NYISO asset profile · https://askthegrid.com/assets/facilities/stephentown-spindle

20 MW flywheel plant for NYISO frequency regulation

Stephentown Spindle is a 20 MW flywheel facility in Stephentown, New York. Its 20 one-megawatt pods contain 200 flywheels and serve NYISO frequency regulation; Stephentown Spindle LLC owns the project and Convergent Energy + Power operates it. Convergent reports 5 MWh for the facility, while EIA's June 2026 inventory reports 15 MWh.

## Profile

- **Published energy ratings:** Convergent reports 5 MWh for the facility; EIA's June 2026 inventory reports 15 MWh.

## Metrics

- **Storage power:** 20 MW — Exact-project and June 2026 EIA records.
- **Project energy:** 5 MWh — Convergent and equipment-backed project rating.
- **EIA energy:** 15 MWh — June 2026 preliminary EIA inventory.
- **Flywheels:** 200 — Twenty one-megawatt pods with ten flywheels each.

## Facts

- **EIA operator:** Convergent Energy and Power LP — June 2026 preliminary EIA inventory; status OP.
- **Location:** Stephentown · Rensselaer · NY
- **Technology:** Flywheel
- **Operating records:** 2011-01

## Related parties

- **Portfolio operator / current portfolio sponsor:** Convergent Energy + Power — Financing covers a portfolio that includes Stephentown Spindle. ([source](https://convergentep.com/news/convergent-energy-power-acquires-40-mw-of-flywheel-projects))

## Sources

- [June 2026 EIA-860M generator inventory](https://www.eia.gov/electricity/data/eia860m/xls/june_generator2026.xlsx) — U.S. Energy Information Administration · authoritative — Current generator capacity, technology, operating status, operator, and service-date records.

---

Canonical page: https://askthegrid.com/assets/facilities/stephentown-spindle
Website: [Convergent Energy and Power LP](http://convergentep.com/)

Source: Ask the Grid — https://askthegrid.com/