Holyoke MA BESS 1Under construction
Hampden County, Massachusetts · EIA plant ID 69551 · Operator: Holyoke MA BESS 1 LLC
5 MW under construction (Batteries), first expected Oct 2026 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 5 MW building
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 |
|---|---|---|---|---|---|---|---|---|
| 90915 | Batteries | BA | 5 | 5 | planned Oct 2026 | Under construction | — | coming soon |
Owner / operator
Operator: Holyoke MA BESS 1 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.
| Chicopee BESS | — | 3.1 km |
| Dwight | 1 MW | 3.7 km |
| Holyoke Solar Cooperative at Mueller | 3 MW | 3.8 km |
| Chemical | 2 MW | 4.2 km |
| Chicopee Granby Road Solar | 2 MW | 4.5 km |
| Cabot Holyoke | 3 MW | 4.8 km |