Exelon West Medway II LLC
Norfolk County, Massachusetts · EIA plant ID 59882 · Operator: Exelon Power
Nameplate264MWSummer 189 MW
Generators2in service
Net generation228GWh12 mo to Aug 2026
Capacity factor14%gas/coal/oil units, summer MW
Heat rate9,943Btu/kWhfossil units, electric fuel, HHV
First online2019Runs as peaking
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), 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) |
|---|---|---|---|
| 2019 | 114.6 | 8.9% | 10,643 |
| 2020 | 195.6 | 11.6% | 10,828 |
| 2021 | 190.9 | 11.5% | 10,196 |
| 2022 | 232.2 | 13.9% | 10,112 |
| 2023 | 164.2 | 10.4% | 10,446 |
| 2024 | 201.2 | 12.2% | 10,108 |
| 2025 | 210.9 | 12.8% | 9,973 |
Fuel capability
Gas-fired turbines (CT/GT/CA/CS) that can also burn liquid fuel. EIA-860 Schedule 3 for capability, EIA-923 for actual burn.
StatusLikely still dual fuel
Liquid fuel burned · 36 mo168,113 MMBtu
Last month with liquid burnFeb 2026
Switch while operatingYes
Net summer MW on gas189
Net summer MW on oil189
Time gas → oilup to 1 h (EIA 1H)
Time oil → gasup to 1 h (EIA 1H)
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 |
|---|---|---|---|---|---|---|---|---|
| 4 | Natural Gas Fired Combustion Turbine | GT | 131.8 | 94.4 | Mar 2019 | Operating | — | coming soon |
| 5 | Natural Gas Fired Combustion Turbine | GT | 131.8 | 94.2 | May 2019 | Operating | — | coming soon |
Owner / operator
Operator: Exelon Power. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Exelon Power | 100.0% | 264 MW |
Nearby plants
Within 80 km.
| Exelon Medway LLC | 135 MW | 0.3 km |
| Medway Grid | 250 MW | 0.9 km |
| ANP Bellingham Energy Project | 578 MW | 3 km |
| Holliston Solar CSG | 1 MW | 4.1 km |
| Bourne (MA) - Holliston I | 2 MW | 4.6 km |
| Milford Power LP | 249 MW | 5.6 km |