Cottage Street Solar Facility
Hampden County, Massachusetts · EIA plant ID 58568 · Operator: Western Massachusetts Electric Company
Nameplate3MWSummer 3 MW
Generators1in service
Net generation4GWh12 mo to Aug 2026
Capacity factor15%solar units, summer MW
Heat rate—thermal plants only
First online2014
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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 | 3 | 15.8% | — |
| 2015 | 5.1 | 18.3% | — |
| 2016 | 5.1 | 18.0% | — |
| 2017 | 4.3 | 15.5% | — |
| 2018 | 4.6 | 16.3% | — |
| 2019 | 4.2 | 14.9% | — |
| 2020 | 4.7 | 16.6% | — |
| 2021 | 4.6 | 16.3% | — |
| 2022 | 5.1 | 18.3% | — |
| 2023 | 3.6 | 12.7% | — |
| 2024 | 2.8 | 9.9% | — |
| 2025 | 3.6 | 12.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| PV-3 | Solar Photovoltaic | PV | 3.2 | 3.2 | May 2014 | Operating | — | coming soon |
Owner / operator
Operator: Western Massachusetts Electric Company. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Western Massachusetts Electric Company | 100.0% | 3 MW |
Nearby plants
Within 80 km.
| East Springfield Solar PV | 1 MW | 1.1 km |
| Chicopee River Solar | 2 MW | 1.3 km |
| Smith & Wesson at Springfield MA PV | 2 MW | 1.3 km |
| Springfield Solar PV | 4 MW | 1.5 km |
| Indian Orchard Plant 1 | 6 MW | 1.7 km |
| Masspower | 261 MW | 1.9 km |