RedbridgeOut of service
Hampden County, Massachusetts · EIA plant ID 1638 · Operator: nautilus hydro, llc
Nameplate4MWSummer 4 MW
Generators2in service
Net generation0GWh12 mo to Dec 2025
Capacity factor0%hydro units, summer MW
Heat rate—thermal plants only
First online1926
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 | 9.7 | 32.5% | — |
| 2002 | 4.9 | 26.5% | — |
| 2003 | 14.3 | 77.1% | — |
| 2004 | 13 | 70.0% | — |
| 2005 | 17.5 | 94.6% | — |
| 2006 | 17.4 | 94.2% | — |
| 2007 | 8.6 | 46.6% | — |
| 2008 | 18.6 | 101.0% | — |
| 2009 | 19.8 | 107.4% | — |
| 2010 | 13 | 70.5% | — |
| 2011 | 20.6 | 112.1% | — |
| 2012 | 10.7 | 58.0% | — |
| 2013 | 11.7 | 33.3% | — |
| 2014 | 8.6 | 24.5% | — |
| 2015 | 6.6 | 18.9% | — |
| 2016 | 6.7 | 19.1% | — |
| 2017 | 10.7 | 30.6% | — |
| 2018 | 22.8 | 72.3% | — |
| 2019 | 17.8 | 56.6% | — |
| 2020 | 14.1 | 44.5% | — |
| 2021 | 18.1 | 57.5% | — |
| 2022 | 14.4 | 45.7% | — |
| 2023 | 13.4 | 42.4% | — |
| 2024 | 0 | 0.0% | — |
| 2025 | 0 | 0.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| RB3 | Conventional Hydroelectric | HY | 1.8 | 1.8 | Jan 1934 | Operating (Out of service) | — | coming soon |
| RB4 | Conventional Hydroelectric | HY | 1.8 | 1.8 | Jan 1926 | Operating (Out of service) | — | 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.
| Three Rivers Solar LLC | 5 MW | 1.5 km |
| Collins Facility | 1 MW | 2.4 km |
| Ludlow Site 72 - Conti | 2 MW | 3.3 km |
| Palmer Solar LLC | 3 MW | 3.8 km |
| Huxley Solar | 10 MW | 6.3 km |
| Putts Bridge | 3 MW | 6.7 km |