Sheffield Hewins
Berkshire County, Massachusetts · EIA plant ID 69943 · Operator: Navisun LLC
Nameplate2MWSummer 2 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor11%solar units, summer MW
Heat rate—thermal plants only
First online2022
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) |
|---|---|---|---|
| 2025 | 2 | 10.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| HEWIN | Solar Photovoltaic | PV | 2.1 | 2.1 | Dec 2022 | Operating | — | coming soon |
Owner / operator
Operator: Navisun LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Navisun LLC | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Sand Road | 2 MW | 4 km |
| Bunce | 2 MW | 4.9 km |
| Becton Canaan | 3 MW | 6.4 km |
| Seaboard Sheffield, LLC | 2 MW | 7.9 km |
| Berkshire 1 | 2 MW | 9 km |
| New Marlborough | 5 MW | 10.1 km |