Gardners Falls
Franklin County, Massachusetts · EIA plant ID 1634 · Operator: nautilus hydro, llc
Nameplate4MWSummer 4 MW
Generators4in service
Net generation11GWh12 mo to Dec 2025
Capacity factor37%hydro units, summer MW
Heat rate—thermal plants only
First online1914
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 | 9.8 | 33.4% | — |
| 2002 | 12.1 | 28.0% | — |
| 2003 | 14.4 | 33.3% | — |
| 2004 | 11.9 | 33.5% | — |
| 2005 | 12.4 | 35.2% | — |
| 2006 | 14.7 | 41.6% | — |
| 2007 | 10.7 | 32.0% | — |
| 2008 | 9 | 26.9% | — |
| 2009 | 11.6 | 34.8% | — |
| 2010 | 7.3 | 21.9% | — |
| 2011 | 4.6 | 13.7% | — |
| 2012 | 5.9 | 17.8% | — |
| 2013 | 7.2 | 21.7% | — |
| 2014 | 1.2 | 3.6% | — |
| 2015 | 2.3 | 6.9% | — |
| 2016 | 0 | 0.0% | — |
| 2017 | 1.8 | 5.4% | — |
| 2018 | 9.5 | 30.9% | — |
| 2019 | 11 | 35.8% | — |
| 2020 | 10.7 | 34.7% | — |
| 2021 | 6.1 | 19.9% | — |
| 2022 | 7.2 | 23.3% | — |
| 2023 | 17.7 | 57.7% | — |
| 2024 | 11.1 | 36.0% | — |
| 2025 | 11.4 | 37.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GF2 | Conventional Hydroelectric | HY | 0.4 | 0.4 | Jan 1964 | Operating | — | coming soon |
| GF3 | Conventional Hydroelectric | HY | 0.9 | 0.9 | Jan 1914 | Operating | — | coming soon |
| GF4 | Conventional Hydroelectric | HY | 0.9 | 0.9 | Jan 1914 | Operating | — | coming soon |
| GF5 | Conventional Hydroelectric | HY | 1.3 | 1.3 | Jan 1925 | Operating | — | coming soon |
Owner / operator
Operator: nautilus hydro, llc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| nautilus hydro, llc | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Deerfield 3 | 5 MW | 0.9 km |
| Deerfield 2 | 5 MW | 2.8 km |
| Deerfield 4 | 5 MW | 3.2 km |
| Axio Green LLC | 2 MW | 10 km |
| Deerfield CSG Solar | 5 MW | 12 km |
| Cabot | 62 MW | 12.4 km |