Theresa Plant
Jefferson County, New York · EIA plant ID 10539 · Operator: Energen Renewables, LLC
Nameplate1MWSummer 1 MW
Generators2in service
Net generation4GWh12 mo to Dec 2025
Capacity factor34%hydro units, summer MW
Heat rate—thermal plants only
First online1927
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) |
|---|---|---|---|
| 2001 | 5.1 | 47.1% | — |
| 2002 | 6.5 | 60.0% | — |
| 2003 | 4.9 | 45.3% | — |
| 2004 | 6 | 54.7% | — |
| 2005 | 6.5 | 59.9% | — |
| 2006 | 2.2 | 20.0% | — |
| 2007 | 0.4 | 3.7% | — |
| 2008 | 7.3 | 63.6% | — |
| 2009 | 7.3 | 64.1% | — |
| 2010 | 6.5 | 56.8% | — |
| 2011 | 6.8 | 60.1% | — |
| 2012 | 6.5 | 56.6% | — |
| 2013 | 7.6 | 66.9% | — |
| 2014 | 7.5 | 65.8% | — |
| 2015 | 6.3 | 55.1% | — |
| 2016 | 6.1 | 53.3% | — |
| 2017 | 8.8 | 77.1% | — |
| 2018 | 5.8 | 51.2% | — |
| 2019 | 5.9 | 52.2% | — |
| 2020 | 4.3 | 38.0% | — |
| 2021 | 4.7 | 41.6% | — |
| 2022 | 0.5 | 4.6% | — |
| 2023 | 1.3 | 11.0% | — |
| 2024 | 4.4 | 38.5% | — |
| 2025 | 3.9 | 34.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | HY | 1 | 1 | Jan 1929 | Operating | — | coming soon |
| GEN2 | Conventional Hydroelectric | HY | 0.3 | 0.3 | Jan 1927 | Operating | — | coming soon |
Owner / operator
Operator: Energen Renewables, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Energen Renewables, LLC | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Philadlephia | 4 MW | 9.5 km |
| Tracy Solar Energy Center | — | 15.8 km |
| OYA Robinson Road | 5 MW | 16.4 km |
| Blanchard Road 2 Community Solar | 10 MW | 17.7 km |
| NYS Rte 12 Community Solar | 10 MW | 17.7 km |
| Great Lakes Seaway Community Solar | 10 MW | 17.7 km |