Mass Midstate Solar 1
Worcester County, Massachusetts · EIA plant ID 58279 · Operator: First Wind O&M, LLC
Nameplate5MWSummer 5 MW
Generators1in service
Net generation7GWh12 mo to Dec 2025
Capacity factor16%solar units, summer MW
Heat rate—thermal plants only
First online2014
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) |
|---|---|---|---|
| 2014 | 4.5 | 15.4% | — |
| 2015 | 7.4 | 17.0% | — |
| 2016 | 7.6 | 17.4% | — |
| 2017 | 6.3 | 14.3% | — |
| 2018 | 6.4 | 14.5% | — |
| 2019 | 7.3 | 16.7% | — |
| 2020 | 7.4 | 16.9% | — |
| 2021 | 7.4 | 16.9% | — |
| 2022 | 7.8 | 17.8% | — |
| 2023 | 7.3 | 16.7% | — |
| 2024 | 7.2 | 16.5% | — |
| 2025 | 7.1 | 16.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Solar Photovoltaic | PV | 5 | 5 | May 2014 | Operating | — | coming soon |
Owner / operator
Operator: First Wind O&M, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| First Wind O&M, LLC | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Mass Midstate Solar 3 | 4 MW | 0 km |
| Leicester One MA Solar LLC | 5 MW | 0.3 km |
| Stafford St Solar 1 CSG | 2 MW | 0.8 km |
| Stafford St 2 Community Solar | 2 MW | 0.8 km |
| Stafford St Solar 3 CSG | 1 MW | 0.8 km |
| Boutillier Solar, LLC CSG | 3 MW | 1 km |