Putts Bridge
Hampden County, Massachusetts · EIA plant ID 1637 · Operator: nautilus hydro, llc
Nameplate3MWSummer 3 MW
Generators2in service
Net generation11GWh12 mo to Dec 2025
Capacity factor38%hydro units, summer MW
Heat rate—thermal plants only
First online1918
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 | 11 | 41.3% | — |
| 2002 | 8.1 | 17.3% | — |
| 2003 | 15 | 32.1% | — |
| 2004 | 11.5 | 39.4% | — |
| 2005 | 13.7 | 47.0% | — |
| 2006 | 15.1 | 51.9% | — |
| 2007 | 12.1 | 41.9% | — |
| 2008 | 0 | 0.0% | — |
| 2009 | 18.7 | 64.6% | — |
| 2010 | 12.7 | 44.0% | — |
| 2011 | 21.1 | 73.0% | — |
| 2012 | 10.6 | 36.7% | — |
| 2013 | 13.9 | 44.0% | — |
| 2014 | 14.3 | 45.3% | — |
| 2015 | 8.6 | 27.4% | — |
| 2016 | 8.1 | 25.5% | — |
| 2017 | 13.2 | 42.0% | — |
| 2018 | 22.6 | 80.5% | — |
| 2019 | 19.5 | 69.4% | — |
| 2020 | 8.1 | 29.0% | — |
| 2021 | 10.5 | 37.5% | — |
| 2022 | 15.1 | 53.8% | — |
| 2023 | 22.2 | 79.3% | — |
| 2024 | 16 | 56.9% | — |
| 2025 | 10.6 | 37.7% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| PB2 | Conventional Hydroelectric | HY | 1.6 | 1.6 | Jan 1918 | Operating | — | coming soon |
| PB3 | Conventional Hydroelectric | HY | 1.6 | 1.6 | Jan 1918 | 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% | 3 MW |
Nearby plants
Within 80 km.
| Indian Orchard PV Facility | 2 MW | 1.3 km |
| Oak Street Solar | 4 MW | 1.3 km |
| Indian Orchard | 4 MW | 1.8 km |
| Masspower | 261 MW | 3 km |
| Indian Orchard Plant 1 | 6 MW | 3.1 km |
| Ludlow Landfill | 2 MW | 3.2 km |