# Granite Ridge

ISO-NE asset profile · https://askthegrid.com/assets/facilities/granite-ridge

Granite Ridge Energy LLC - Rockingham County - ISONE

Granite Ridge is a 790 MW operating natural-gas-fired combined-cycle power station located at 21 North Wentworth Avenue in Londonderry, Rockingham County, New Hampshire.

## Metrics

- **Nameplate capacity:** 790 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 55170 — plant-55170

## Facts

- **Technology:** Natural Gas Fired Combined Cycle
- **Operator:** Granite Ridge Energy LLC

## Related parties

- **Operator / parent company:** Calpine LLC — Acquiring company and operating parent ([source](https://www.calpine.com/))
- **Parent company:** Constellation Energy Corporation — Current ultimate parent ([source](https://www.constellationenergy.com/))
- **Former owner / developer:** AES Corporation — Original developer and predecessor owner through subsidiary AES Londonderry LLC ([source](https://www.aes.com/))
- **Equity investor:** Granite Ridge I SPE LLC — Lender-formed entity that received foreclosure equity
- **O&M provider / power marketer:** Energy Northwest — Early operator and potential output purchaser ([source](https://www.energy-northwest.com/))

## Sources

- [constellationenergy.gcs-web.com](https://constellationenergy.gcs-web.com/static-files/d490ed49-5b20-4619-b6f7-65fcb90c7e99) — constellationenergy.gcs-web.com · public_source — Source retained for exact-record publication review.
- [constellationenergy.com](https://www.constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html) — constellationenergy.com · public_source — Source retained for exact-record publication review.
- [industrialinfo.com](https://www.industrialinfo.com/news/article/aes-nearing-completion-on-granite-ridge-project--12961) — industrialinfo.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/granite-ridge

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