CoreSite - Somerville
Middlesex County, Massachusetts · EIA plant ID 66151 · Operator: Bloom Energy
Nameplate4MWSummer 4 MW
Generators1in service
Net generation28GWh12 mo to Dec 2025
Capacity factor88%gas/coal/oil units, summer MW
Heat rate6,947Btu/kWhfossil units, electric fuel, HHV
First online2020Runs as baseload
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), gas/coal/oil 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2022 | 33.2 | 105.2% | 6,228 |
| 2023 | 29.8 | 94.6% | 6,047 |
| 2024 | 4.5 | 14.3% | 7,296 |
| 2025 | 27.8 | 88.2% | 6,947 |
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 |
|---|---|---|---|---|---|---|---|---|
| CST00 | Other Natural Gas | FC | 3.6 | 3.6 | Sep 2020 | Operating | — | coming soon |
Owner / operator
Operator: Bloom Energy. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Bloom Energy | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Kendall Square Station | 235 MW | 1.5 km |
| Charlestown Wind Turbine | 2 MW | 1.8 km |
| Mass Inst Tech Cntrl Utilities/Cogen Plt | 43 MW | 2.1 km |
| Signature Breads Chelsea | 2 MW | 3.4 km |
| Gillette SBMC | 14 MW | 4.2 km |
| Boston Medical Center CHP Plant | 3 MW | 4.7 km |