Exelon West Medway II LLC
Exelon West Medway II LLC is a 264 MW natural gas power plant in Norfolk County, Massachusetts, operated by Constellation Power, Inc. EIA-860M lists 2 generating units here, inside ISO New England. Its units entered service in 2019.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 263.6 MW
- 188.6 MW net summer
- Generating units
- 2
- In service
- 2019
- EIA plant ID
- 59882
Where it is
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- County
- Norfolk County, Massachusetts
- Coordinates
- 42.1372, -71.4447
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Constellation Power, Inc
- Primary energy source
- Natural gas
- Technologies
- Natural Gas Fired Combustion Turbine
- Status
- Operating
Exelon West Medway II LLC: FAQ
- Where is Exelon West Medway II LLC?
- In Norfolk County, Massachusetts (MA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Exelon West Medway II LLC?
- 264 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
- Who owns Exelon West Medway II LLC?
- EIA-860M names Constellation Power, Inc as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is Exelon West Medway II LLC still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.