Stevenson
Fairfield County, Connecticut · EIA plant ID 553 · Operator: FirstLight Power Resources Services LLC
Nameplate31MWSummer 29 MW
Generators4in service
Net generation71GWh12 mo to Dec 2025
Capacity factor28%hydro units, summer MW
Heat rate—thermal plants only
First online1919
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 | 62.2 | 24.5% | — |
| 2002 | 74.7 | 30.0% | — |
| 2003 | 127.6 | 51.5% | — |
| 2004 | 102.4 | 41.2% | — |
| 2005 | 106.1 | 42.8% | — |
| 2006 | 122.7 | 49.5% | — |
| 2007 | 80.3 | 32.3% | — |
| 2008 | 127.3 | 51.0% | — |
| 2009 | 114.7 | 46.1% | — |
| 2010 | 88.7 | 35.7% | — |
| 2011 | 136 | 54.7% | — |
| 2012 | 71.9 | 28.3% | — |
| 2013 | 93.9 | 37.1% | — |
| 2014 | 93.2 | 36.8% | — |
| 2015 | 70.2 | 27.7% | — |
| 2016 | 50.1 | 19.8% | — |
| 2017 | 77.2 | 30.5% | — |
| 2018 | 138.1 | 54.5% | — |
| 2019 | 105.7 | 41.7% | — |
| 2020 | 79.4 | 31.3% | — |
| 2021 | 116.6 | 46.0% | — |
| 2022 | 61.6 | 24.3% | — |
| 2023 | 111.2 | 43.9% | — |
| 2024 | 95.8 | 37.7% | — |
| 2025 | 70.8 | 28.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 7.5 | 7.1 | Jan 1919 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 7.5 | 7.1 | Jan 1919 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 7.5 | 7.1 | Jan 1919 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 8 | 7.6 | Jan 1936 | Operating | — | coming soon |
Owner / operator
Operator: FirstLight Power Resources Services LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| FirstLight Hydro Generating Company | 100.0% | 31 MW |
Nearby plants
Within 80 km.
| Kinneytown New Old | 2 MW | 7.3 km |
| Derby Hydro | 9 MW | 8.7 km |
| Derby Fuel Cell | 14 MW | 8.9 km |
| Benz Solar 1 | 1 MW | 10.2 km |
| Benz Solar 2 | 1 MW | 10.2 km |
| IBM Southbury | retired | 10.4 km |