Medway Grid
Medway Grid is a 250 MW battery storage project in Norfolk County, Massachusetts, operated by Medway Grid LLC. EIA-860M lists 1 generating unit here, inside ISO New England. Its unit entered service in 2026.
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
- 250 MW
- 250 MW net summer
- Generating units
- 1
- In service
- 2026
- EIA plant ID
- 69720
Where it is
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- County
- Norfolk County, Massachusetts
- Coordinates
- 42.1454, -71.4474
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Medway Grid LLC
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Operating
Medway Grid: FAQ
- Where is Medway Grid?
- 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 Medway Grid?
- 250 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Medway Grid?
- EIA-860M names Medway Grid LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Medway Grid LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Medway Grid LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Medway Grid LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Medway Grid still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.