High Dam
Oswego County, New York · EIA plant ID 2574 · Operator: Oswego City of
Nameplate12MWSummer 9 MW
Generators4in service
Net generation19GWh12 mo to Dec 2025
Capacity factor25%hydro units, summer MW
Heat rate—thermal plants only
First online1928
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), hydro 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2002 | 44 | 62.8% | — |
| 2003 | 48 | 62.3% | — |
| 2004 | 56.3 | 72.8% | — |
| 2005 | 42.4 | 55.0% | — |
| 2006 | 49.5 | 64.2% | — |
| 2007 | 40.5 | 52.6% | — |
| 2008 | 39.6 | 51.2% | — |
| 2009 | 42.2 | 54.8% | — |
| 2010 | 43.1 | 56.0% | — |
| 2011 | 48.3 | 62.6% | — |
| 2012 | 36.4 | 47.1% | — |
| 2013 | 46 | 59.6% | — |
| 2014 | 49.8 | 64.6% | — |
| 2015 | 45.1 | 58.5% | — |
| 2016 | 35.6 | 46.1% | — |
| 2017 | 43.3 | 56.1% | — |
| 2018 | 30.3 | 39.3% | — |
| 2019 | 43.6 | 56.6% | — |
| 2020 | 18.9 | 24.4% | — |
| 2021 | 21.4 | 27.8% | — |
| 2022 | 0 | 0.0% | — |
| 2023 | 3.8 | 5.0% | — |
| 2024 | 25.6 | 33.1% | — |
| 2025 | 19.1 | 24.8% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 2.8 | 2.2 | Aug 1928 | Operating (Out of service, expected back within the year) | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 2.8 | 2.2 | Aug 1928 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 2.8 | 2.2 | Aug 1928 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 3.5 | 2.2 | Aug 1949 | Operating | — | coming soon |
Owner / operator
Operator: Oswego City of. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Oswego City of | 100.0% | 12 MW |
Nearby plants
Within 80 km.
| Varick | 8 MW | 0.9 km |
| Onondaga County- Clearwater | 2 MW | 2.2 km |
| Summit - Scriba CSG | 5 MW | 3.1 km |
| Indeck Oswego Energy Center | 57 MW | 3.1 km |
| Oswego Harbor Power | 1,804 MW | 3.3 km |
| SSC Oswego II LLC | 5 MW | 3.6 km |