Oswego Harbor Power
Oswego County, New York · EIA plant ID 2594 · Operator: oswego harbor power
Nameplate1,804MWSummer 1,614 MW
Generators2in service
Net generation117GWh12 mo to Aug 2026
Capacity factor0%gas/coal/oil units, summer MW
Heat rate13,257Btu/kWhfossil units, electric fuel, HHV
First online1975Runs as rarely runs
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 465.5 | 3.1% | 13,363 |
| 2002 | 415.2 | 2.8% | 12,944 |
| 2003 | 389.8 | 2.7% | 10,779 |
| 2004 | 406.7 | 2.8% | 10,479 |
| 2005 | 1,021.4 | 7.0% | 10,572 |
| 2006 | 126.4 | 0.9% | 11,809 |
| 2007 | 247.7 | 1.7% | 10,833 |
| 2008 | 91.9 | 0.6% | 11,816 |
| 2009 | 74.6 | 0.5% | 11,698 |
| 2010 | 64.7 | 0.4% | 12,438 |
| 2011 | 68.2 | 0.5% | 12,023 |
| 2012 | 63.4 | 0.4% | 12,887 |
| 2013 | 84.7 | 0.6% | 12,267 |
| 2014 | 83.9 | 0.6% | 11,552 |
| 2015 | 69.3 | 0.5% | 11,440 |
| 2016 | 38.9 | 0.3% | 11,696 |
| 2017 | 39.7 | 0.3% | 11,050 |
| 2018 | 41.7 | 0.3% | 13,914 |
| 2019 | 16.8 | 0.1% | 24,982 |
| 2020 | 22.5 | 0.2% | 25,439 |
| 2021 | 11.6 | 0.1% | — |
| 2022 | 41.1 | 0.3% | 16,515 |
| 2023 | 46.9 | 0.3% | 14,576 |
| 2024 | 44.3 | 0.3% | 12,533 |
| 2025 | 85.1 | 0.6% | 13,062 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| ST5 | Petroleum Liquids | ST | 901.8 | 800.6 | Jun 1975 | Operating | — | coming soon |
| ST6 | Petroleum Liquids | ST | 901.8 | 812.9 | Dec 1979 | Operating | — | coming soon |
| 5 | Petroleum Liquids | ST | 901.8 | 842.5 | Jun 1975 | not_current | — | coming soon |
| 6 | — | ST | 901.8 | 838.3 | Dec 1979 | not_current | — | coming soon |
| 3 | Natural Gas Steam Turbine | ST | 92 | — | Dec 1948 | Retired Dec 2003 | — | coming soon |
Owner / operator
Operator: oswego harbor power. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| ArcLight Capital Partners LLC | 100.0% | 1,804 MW |
Nearby plants
Within 80 km.
| Varick | 8 MW | 2.4 km |
| High Dam | 12 MW | 3.3 km |
| Indeck Oswego Energy Center | 57 MW | 3.4 km |
| Onondaga County- Clearwater | 2 MW | 3.5 km |
| SSC Oswego II LLC | 5 MW | 5 km |
| Summit - Scriba CSG | 5 MW | 5.4 km |