401 South
Berkshire County, Massachusetts · EIA plant ID 67241 · Operator: Madison Energy Investments LLC
Nameplate2MWSummer 2 MW
Generators2in service
Net generation1GWh12 mo to Dec 2025
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2023
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), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
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) |
|---|---|---|---|
| 2023 | 0 | — | — |
| 2024 | 0.4 | — | — |
| 2025 | 0.9 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 401SB | Batteries | BA | 1 | 1 | Dec 2023 | Operating | — | coming soon |
| 4SPV1 | Solar Photovoltaic | PV | 0.5 | 0.5 | Dec 2023 | Operating | — | coming soon |
Owner / operator
Operator: Madison Energy Investments LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Madison Energy Investments LLC | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Downing Parkway Solar | 2 MW | 1.2 km |
| Doreen | retired | 2.9 km |
| Pittsfield Generating LP | 176 MW | 2.9 km |
| Pittsfield 44 - M&W PV | 1 MW | 3.7 km |
| Partridge Solar | 8 MW | 3.8 km |
| Silver Lake Solar Photovoltaic Facility | 2 MW | 4.8 km |