Wilmarth Solar
Norfolk County, Massachusetts · EIA plant ID 64436 · Operator: Wilmarth Lane Solar 1, LLC
Nameplate7MWSummer 7 MW
Generators2in service
Net generation8GWh12 mo to Dec 2025
Capacity factor18%solar units, summer MW
Heat rate—thermal plants only
First online2020
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) |
|---|---|---|---|
| 2020 | 6.4 | 15.8% | — |
| 2021 | 8.7 | 19.8% | — |
| 2022 | 8.5 | 19.7% | — |
| 2023 | 8.3 | 19.0% | — |
| 2024 | 8 | 18.4% | — |
| 2025 | 7.9 | 18.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| WIL | Solar Photovoltaic | PV | 5 | 5 | Feb 2020 | Operating | — | coming soon |
| WILB | Batteries | BA | 2.3 | 2.3 | Feb 2020 | Operating | — | coming soon |
Owner / operator
Operator: Wilmarth Lane Solar 1, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wilmarth Lane Solar 1, LLC | 100.0% | 7 MW |
Nearby plants
Within 80 km.
| 5 Berry | 7 MW | 1.1 km |
| Franklin 1 | 3 MW | 3.7 km |
| Kearsarge Upper Union | 2 MW | 4.2 km |
| Franklin 2 | 4 MW | 4.5 km |
| Solten Plainville 6000, LLC | 5 MW | 5.3 km |
| 126 Grove Solar LLC | 2 MW | 8.1 km |