Dwight
Hampden County, Massachusetts · EIA plant ID 6378 · Operator: nautilus hydro, llc
Nameplate1MWSummer 1 MW
Generators3in service
Net generation6GWh12 mo to Dec 2025
Capacity factor53%hydro units, summer MW
Heat rate—thermal plants only
First online1920
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 | 2.6 | 26.4% | — |
| 2002 | 3.4 | 18.9% | — |
| 2003 | 3.6 | 20.1% | — |
| 2004 | 4.1 | 37.2% | — |
| 2005 | 4.5 | 40.5% | — |
| 2006 | 3 | 27.4% | — |
| 2007 | 5.7 | 50.1% | — |
| 2008 | 2.1 | 18.5% | — |
| 2009 | 6.2 | 54.2% | — |
| 2010 | 3.4 | 30.2% | — |
| 2011 | 3.9 | 34.3% | — |
| 2012 | 3.7 | 32.7% | — |
| 2013 | 3.3 | 28.8% | — |
| 2014 | 0 | 0.0% | — |
| 2015 | 0 | 0.0% | — |
| 2016 | 1.6 | 13.6% | — |
| 2017 | 3.8 | 33.6% | — |
| 2018 | 6.4 | 60.6% | — |
| 2019 | 5.2 | 49.5% | — |
| 2020 | 4.3 | 40.5% | — |
| 2021 | 9 | 85.5% | — |
| 2022 | 5.3 | 50.0% | — |
| 2023 | 9.8 | 93.5% | — |
| 2024 | 6.3 | 60.2% | — |
| 2025 | 5.6 | 53.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| DW2 | Conventional Hydroelectric | HY | 0.4 | 0.4 | Jan 1920 | Operating | — | coming soon |
| DW3 | Conventional Hydroelectric | HY | 0.4 | 0.4 | Jan 1920 | Operating | — | coming soon |
| DW4 | Conventional Hydroelectric | HY | 0.4 | 0.4 | Jan 1920 | 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% | 1 MW |
Nearby plants
Within 80 km.
| Chicopee Granby Road Solar | 2 MW | 1.6 km |
| Front Street | 8 MW | 1.6 km |
| Chicopee Hydroelectric Station | 2 MW | 2.6 km |
| Chicopee BESS | — | 2.7 km |
| Holyoke MA BESS 1 | — | 3.7 km |
| Chicopee Solar | 3 MW | 4.6 km |