# Oswego Harbor Power

NYISO battery_storage · https://askthegrid.com/nyiso/assets/plant/oswego-harbor-power

Oswego Harbor Power is an approximately 1,600–1,800 MW oil-fired steam-electric generation facility located in Oswego, New York, on the southeastern shore of Lake Ontario. Both units fire residual fuel oil (#6); Unit 6 also has limited natural-gas capability. The plant includes two auxiliary house boilers for station heating and four on-site residual-oil storage tanks. The facility is interconnected with the transmission system through an agreement with Niagara Mohawk Power Corporation and participates in the New York Independent System Operator market. Unit 5 was completed in 1975 and Unit 6 in 1979–1980. The facility is owned and operated by Oswego Harbor Power LLC, an indirect subsidiary of Alpha Generation, LLC, which is in turn a majority subsidiary of ArcLight Energy Partners Fund VII, L.P. The facility operates as an exempt wholesale generator with Federal Energy Regulatory Commission market-based-rate authorization and generally sells energy into NYISO markets without serving captive retail load.

## Key facts

- Technology: Petroleum Liquids
- Power capacity: 1803.6 MW

## Grid and market context

- ISO/RTO: NYISO
- Balancing authority: NYISO

## Source-backed facts

- Technical.site acres: 93 acres — alphagen.com · confidence: review_required
- Technical.power mw: 1641 MW — alphagen.com · confidence: review_required
- Technical.unit 5 commissioning year: 1975 year — alphagen.com · confidence: review_required
- Technical.unit 6 commissioning year: 1980 year — downloads.regulations.gov · confidence: review_required
- Technical.unit count: 2 — documents.dps.ny.gov · confidence: review_required
- Technical.unit 5 capacity mw: 850 MW — epa.gov · confidence: review_required
- Technical.unit 6 capacity mw: 850 MW — epa.gov · confidence: review_required
- Transactions.acquisition date: 2021-12-01 — documents.dps.ny.gov · confidence: review_required

## Timeline

- 1999-09-15 — FERC market-based-rate authorization
  FERC issued market-based-rate tariff authorization for Oswego Harbor Power, LLC in docket ER99-3637-000 and related dockets, granting the facility exempt wholesale generator status.
  Source: energy.gov (https://www.energy.gov/sites/default/files/2026-02/EA-528_OswegoHarborPowerLLC_App%20%281%29.pdf)
- 2021-04-05 — Generation Bridge/ArcLight acquisition petition filed
  Generation Bridge Acquisition, LLC and NRG Energy, Inc. jointly filed a petition with the New York PSC for transfer of upstream ownership interests in Oswego Harbor Power, LLC.
  Source: documents.dps.ny.gov (https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7BB59C3749-BA15-4960-BC0B-BBE5B8660165%7D&DocTitle=Order%20Approving%20Financing%20and%20Ruling%20on%20Transfer)
- 2021-11-22 — Generation Bridge/ArcLight acquisition authorized and financing approved
  New York Public Service Commission issued an order approving the transfer of upstream ownership interests from NRG to Generation Bridge without further PSL §70 review. The order authorized up to $700 million in indebtedness for the acquisition, transaction expenses, and working capital, secured by interests in all eight project companies in the broader portfolio.
  Source: documents.dps.ny.gov (https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7BB59C3749-BA15-4960-BC0B-BBE5B8660165%7D&DocTitle=Order%20Approving%20Financing%20and%20Ruling%20on%20Transfer)
- 2021-12-01 — Generation Bridge closed portfolio acquisition from NRG
  Generation Bridge closed the acquisition of a 4.9 GW power generation portfolio from NRG Energy, including Oswego Harbor Power. The broader portfolio acquisition was financed with $540 million of senior-secured institutional term-loan facilities.
  Source: prnewswire.com (https://www.prnewswire.com/news-releases/arclight-closes-acquisition-of-4-9gw-power-generation-portfolio-from-nrg-energy-301437923.html)
- 2022-02-01 — Post-acquisition operating structure documented
  PSC-filed materials document the post-acquisition operating structure, identifying Oswego Harbor Power as a Generation Bridge subsidiary with Consolidated Asset Management Services providing operations services and Eastern Generation providing asset management.
  Source: documents.dps.ny.gov (https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B5F1B2E46-F4DC-4C29-B761-99E0DCF8B23A%7D)
- 2025-11-05 — DOE export application filed
  Oswego Harbor Power LLC filed an application with the U.S. Department of Energy for authorization to transmit electric energy to Canada for five years. The application describes the facility as approximately 1,564 MW summer-rating oil-fired generation and states that Oswego Harbor has entered into a contractual arrangement to sell installed capacity and associated energy to Canada.
  Source: energy.gov (https://www.energy.gov/sites/default/files/2026-02/EA-528_OswegoHarborPowerLLC_App%20%281%29.pdf)

## Sources

- [arclight.com](https://arclight.com/focus/) — arclight.com · tier public_source
- [camstex.com](https://camstex.com/wp-content/uploads/2023/12/EHSR-Q1-2022-Newsletter.pdf) — camstex.com · tier public_source
- [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B508FF888-0000-CA18-A228-C29FE2AAA5FD%7D) — documents.dps.ny.gov · tier authoritative
- [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7B5F1B2E46-F4DC-4C29-B761-99E0DCF8B23A%7D) — documents.dps.ny.gov · tier authoritative
- [documents.dps.ny.gov](https://documents.dps.ny.gov/public/Common/ViewDoc.aspx?DocRefId=%7BB59C3749-BA15-4960-BC0B-BBE5B8660165%7D&DocTitle=Order%20Approving%20Financing%20and%20Ruling%20on%20Transfer) — documents.dps.ny.gov · tier authoritative
- [downloads.regulations.gov](https://downloads.regulations.gov/EPA-R02-OAR-2012-0296-0064/attachment_12.pdf) — downloads.regulations.gov · tier authoritative
- [alphagen.com](https://www.alphagen.com/) — alphagen.com · tier public_source
- [alphagen.com](https://www.alphagen.com/compliance/plant/oswego/) — alphagen.com · tier public_source
- [energy.gov](https://www.energy.gov/oe/ea-528-oswego-harbor-power-llc) — energy.gov · tier authoritative
- [energy.gov](https://www.energy.gov/sites/default/files/2026-02/EA-528_OswegoHarborPowerLLC_App%20%281%29.pdf) — energy.gov · tier authoritative
- [epa.gov](https://www.epa.gov/sites/default/files/2021-05/documents/ny_rh_oswego_harbor_power_final_bart_permit.pdf) — epa.gov · tier authoritative
- [prnewswire.com](https://www.prnewswire.com/news-releases/arclight-closes-acquisition-of-4-9gw-power-generation-portfolio-from-nrg-energy-301437923.html) — prnewswire.com · tier public_source

## Data quality

- The plant is consistently identified by EIA plant ID 2594, DEC Facility ID 7351200030, and the Oswego Harbor Power name; the historical name Oswego Steam Station refers to the same site. Published capacity figures differ by definition and source: approximately 1,564 MW summer rating in the 2025 DOE filing, approximately 1,617 MW nominal capacity in New York PSC materials, and 1,803.6 MW in the GlobalData/Power Technology profile. These should not be treated as interchangeable net, summer, nominal, or nameplate ratings. Unit 6 commissioning year shows 1979 in the Alpha Generation owner website and 1980 in the TRK engineering report. The 1980 date is selected as it appears in the detailed engineering assessment prepared in 2012. The official DEC permit identifies Units 5 and 6 and their emissions compliance obligations. NYISO materials indicate Unit 6 may operate up to 245 MW on natural gas under specified conditions, while the PSC operations plan describes Unit 6 as having limited natural-gas capability; this reflects differing regulatory descriptions of the same dual-fuel capability rather than evidence of a separate gas plant. The evidence supports construction and commercial-operation milestones, ownership transfers, fuel capability, and acquisition financing. It does not establish a separate post-1975 repowering project or a permanent retirement date for Units 5 or 6. Older Units 1–4 are reported as retired by October 1999. The $540 million senior-secured credit facilities and the $700 million authorized debt ceiling relate to the broader Generation Bridge acquisition and associated transaction/working-capital financing; neither figure is identified as the purchase price of Oswego Harbor Power alone. The primary sources do not name an EPC firm.
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