Minuteman Energy Storage
Middlesex County, Massachusetts · EIA plant ID 62644 · Operator: Minuteman Eenergy Storage, LLC
Nameplate5MWSummer 5 MW
Generators1in service
Net generation-0GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2019
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), 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) |
|---|---|---|---|
| 2019 | -0.1 | — | — |
| 2020 | -0.2 | — | — |
| 2021 | -0.2 | — | — |
| 2022 | -0.2 | — | — |
| 2023 | -0.2 | — | — |
| 2024 | -0.3 | — | — |
| 2025 | -0.2 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| MMES | Batteries | BA | 5 | 5 | May 2019 | Operating | — | coming soon |
Owner / operator
Operator: Minuteman Eenergy Storage, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Minuteman Eenergy Storage, LLC | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Kearsarge Wilmington | 2 MW | 3.2 km |
| Kearsarge Riverpark I LLC | 5 MW | 3.4 km |
| Kearsarge Riverpark II LLC | 5 MW | 3.4 km |
| Wilmington Solar | 2 MW | 6.7 km |
| Woburn | 1 MW | 7.1 km |
| Syncarpha Tewksbury Hybrid CSG | 5 MW | 7.1 km |