Energizar BESSPlanned
Suffolk County, Massachusetts · EIA plant ID 69721 · Operator: Energizar Storage LLC
250 MW planned (Batteries), first expected Dec 2027 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online—
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.
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 |
|---|---|---|---|---|---|---|---|---|
| BESS1 | Batteries | BA | 250 | 250 | planned Dec 2027 | Planned | — | coming soon |
Owner / operator
Operator: Energizar Storage LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| Signature Breads Chelsea | 2 MW | 2 km |
| Charlestown Wind Turbine | 2 MW | 4 km |
| CoreSite - Somerville | 4 MW | 5.2 km |
| Kendall Square Station | 235 MW | 5.9 km |
| M Street Jet | 69 MW | 6.3 km |
| Gillette SBMC | 14 MW | 6.4 km |