Millis MA 1
Norfolk County, Massachusetts · EIA plant ID 68437 · Operator: Millis MA 1 LLC
Nameplate1MWSummer 1 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor17%solar units, summer MW
Heat rate—thermal plants only
First online2018
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) |
|---|---|---|---|
| 2024 | 1.6 | 17.7% | — |
| 2025 | 1.5 | 17.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 11998 | Solar Photovoltaic | PV | 1 | 1 | Nov 2018 | Operating | — | coming soon |
Owner / operator
Operator: Millis MA 1 LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Millis MA 1 LLC | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Town of Norfolk MA at Medway Branch | 1 MW | 4.9 km |
| Medway Grid | 250 MW | 5.8 km |
| Exelon West Medway II LLC | 264 MW | 5.9 km |
| Exelon Medway LLC | 135 MW | 5.9 km |
| Holliston LLC | 2 MW | 6.4 km |
| Bourne (MA) - Holliston I | 2 MW | 6.5 km |