Holyoke Solar Cooperative at Mueller
Hampden County, Massachusetts · EIA plant ID 57931 · Operator: Holyoke Solar LLC
Nameplate3MWSummer 3 MW
Generators1in service
Net generation4GWh12 mo to Dec 2025
Capacity factor16%solar units, summer MW
Heat rate—thermal plants only
First online2011
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), solar 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) |
|---|---|---|---|
| 2011 | 0.1 | 6.9% | — |
| 2012 | 4.3 | 18.3% | — |
| 2013 | 4.1 | 17.5% | — |
| 2014 | 5.1 | 21.5% | — |
| 2015 | 3.8 | 16.2% | — |
| 2016 | 4.2 | 17.7% | — |
| 2017 | 3.8 | 16.2% | — |
| 2018 | 3.8 | 16.0% | — |
| 2019 | 3.9 | 16.7% | — |
| 2020 | 4.1 | 17.3% | — |
| 2021 | 3.9 | 16.4% | — |
| 2022 | 4.2 | 17.8% | — |
| 2023 | 3.9 | 16.3% | — |
| 2024 | 3.8 | 16.2% | — |
| 2025 | 3.8 | 16.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| PV1 | Solar Photovoltaic | PV | 2.7 | 2.7 | Dec 2011 | Operating | — | coming soon |
Owner / operator
Operator: Holyoke Solar LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Holyoke Solar LLC | 100.0% | 3 MW |
Nearby plants
Within 80 km.
| Southampton Solar PV | 2 MW | 2.5 km |
| Holyoke MA BESS 1 | — | 3.8 km |
| GSPP Terrawatt Westfield LLC CSG | 4 MW | 4 km |
| Chemical | 2 MW | 6 km |
| Cabot Holyoke | 3 MW | 6.1 km |
| Chicopee BESS | — | 6.1 km |