# Gowanus Gas Turbines Generating

NYISO power_plant · https://askthegrid.com/nyiso/assets/plant/gowanus-gas-turbines-generating

A floating Brooklyn generating station consisting of 32 simple-cycle combustion-turbine units on four power barges. The facility operates as a fast-start peaking resource with dual-fuel capability (natural gas and distillate fuel oil) on 16 of its 32 units. The station has black-start capability and is critical to reliability in NYISO Zone J. The facility was commissioned in June 1971 and remains operational, having been subject to proposed repowering and retirement notices that were withdrawn in April 2026 based on NYISO reliability determinations through May 1, 2029.

## Key facts

- Technology: Natural Gas Fired Combustion Turbine
- Power capacity: 300 MW

## Grid and market context

- ISO/RTO: NYISO
- Balancing authority: NYISO

## Source-backed facts

- Technical.power mw: 640 MW — documents.dps.ny.gov · confidence: review_required
- Technical.unit count: 32 units — documents.dps.ny.gov · confidence: review_required
- Technical.site acres: 25 acres — documents.dps.ny.gov · confidence: review_required
- Operations.interconnection voltage kv: 138 kV — documents.dps.ny.gov · confidence: review_required
- Operations.balancing authority: New York Independent System Operator (NYISO) — alphagen.com · confidence: review_required
- Operations.operating status: operating — psehealthyenergy.org · confidence: review_required
- Operations.status date: 2026-04-16 — alphagen.com · confidence: review_required
- Technical.duration hours: 4.8 hours — psehealthyenergy.org · confidence: review_required
- Operations.grid role: Fast-start, dual-fuel, dispatchable peaking and black-start resource supporting reliability in NYISO Zone J — alphagen.com · confidence: review_required

## Timeline

- 2002-02 — Reliant Energy acquires Orion Power Holdings (includes Gowanus)
  Reliant Energy acquired Orion Power Holdings, thereby becoming the owner of the Gowanus facility.
  Source: nydailynews.com (https://www.nydailynews.com/2004/03/05/power-plant-in-astoria-up-for-sale/)
- 2019 — Gowanus Repowering Project regulatory proposal
  Astoria Generating Company proposed repowering the Gowanus facility by replacing the 32 older, less-efficient units with eight larger, more efficient units on two barges. The proposed repowered Gowanus would have a rating of no greater than 590 MW (50 MW less than the existing 640 MW). The proposal also included permanent retirement of the Narrows facility's 16 units.
  Source: documents.dps.ny.gov (https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B50EEA8CD-58A9-40FC-87B5-3DC6E1CE3D4E%7D)
- 2025-06 — Retirement notices submitted to NYISO
  AlphaGen submitted formal notices of intent to retire the Gowanus and Narrows generating stations following the Peaker Rule timeframe.
  Source: alphagen.com (https://www.alphagen.com/newsroom/press-releases/alphagen-withdraws-retirement-notices-for-gowanus-narrows-generating-stations-following-nyiso-reliability-determinations/)
- 2026-03-16 — AlphaGen proposes Gowanus and Narrows Repowering Projects
  AlphaGen submitted a proposal to Con Edison's Request for Information seeking clean and non-emitting reliability solutions. The proposal included repowering the Gowanus and Narrows sites with three new state-of-the-art lower-emitting power barges, each delivering 273 MW of fast-start, dispatchable capacity, for a potential total of 819 MW. The new barges would be hydrogen-ready and reduce emissions intensity by more than 50% compared to existing units.
  Source: prnewswire.com (https://www.prnewswire.com/news-releases/alphagen-proposes-repowering-and-battery-projects-to-secure-nycs-long-term-grid-reliability-302714755.html)
- 2026-04-16 — Withdrawal of Gowanus and Narrows retirement notices
  AlphaGen formally withdrew the previously submitted notices of intent to retire Gowanus and Narrows after NYISO issued a Short-Term Reliability Process Report determining that continued operation of both facilities was required to maintain reliable electric service in NYISO Zone J through at least May 1, 2029. AlphaGen announced it would continue operating the facilities on a merchant basis.
  Source: alphagen.com (https://www.alphagen.com/newsroom/press-releases/alphagen-withdraws-retirement-notices-for-gowanus-narrows-generating-stations-following-nyiso-reliability-determinations/)

## Sources

- [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B50EEA8CD-58A9-40FC-87B5-3DC6E1CE3D4E%7D) — documents.dps.ny.gov · tier authoritative
- [investor.conedison.com](https://investor.conedison.com/news-releases/news-release-details/con-edison-completes-sales-major-new-york-city-power-plants/) — investor.conedison.com · tier public_source
- [alphagen.com](https://www.alphagen.com/) — alphagen.com · tier public_source
- [alphagen.com](https://www.alphagen.com/newsroom/press-releases/alphagen-withdraws-retirement-notices-for-gowanus-narrows-generating-stations-following-nyiso-reliability-determinations/) — alphagen.com · tier public_source
- [electricnet.com](https://www.electricnet.com/doc/reliant-energy-completes-sale-of-new-york-cit-0001) — electricnet.com · tier public_source
- [nydailynews.com](https://www.nydailynews.com/2004/03/05/power-plant-in-astoria-up-for-sale/) — nydailynews.com · tier public_source
- [prnewswire.com](https://www.prnewswire.com/news-releases/alphagen-proposes-repowering-and-battery-projects-to-secure-nycs-long-term-grid-reliability-302714755.html) — prnewswire.com · tier public_source
- [prnewswire.com](https://www.prnewswire.com/news-releases/arclight-capital-partners-announces-completion-of-eastern-generations-acquisition-of-a-power-asset-portfolio-from-tenaska-300196879.html) — prnewswire.com · tier public_source
- [psehealthyenergy.org](https://www.psehealthyenergy.org/wp-content/uploads/2020/05/New-York.pdf) — psehealthyenergy.org · tier public_source

## Data quality

- Reported capacity figures vary by source and rating convention: Con Edison reported 494 MW (1999), Eastern Generation reported 631 MW (2015), regulatory materials refer to 640 MW, and AlphaGen described 260 MW in one asset-description context. The 640-MW nameplate appears in the primary regulatory filing and is used as the basis for this record. The 2019 Gowanus Repowering Project proposal was a regulatory filing that did not result in completed construction. AlphaGen's 2026 repowering proposal remains a concept subject to Con Edison's Request for Information process. Retirement notices filed in June 2025 were formally withdrawn in April 2026 following NYISO's determination that continued operation is required for Zone J reliability through at least May 1, 2029. The facility's exact asset identity is confirmed by FERC/EIA registry, which maps plant ID 2494 to Gowanus Gas Turbines Generating in Kings County, New York, with associated generator IDs GT31–GT38 and GT41–GT46. NYISO's 2025 Q3 Short-Term Reliability Process Report identifies Gowanus units as operating in NYISO Zone J with specific PTIDs (24114–24121 and 24122–24129), confirming continued operational relevance and market participation.
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