Where is Stony Brook?

In Hampden 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 Stony Brook?

542 MW of nameplate capacity across 10 units, as of the EIA-860M release for 2026-07.

Who owns Stony Brook?

EIA-860M names Massachusetts Mun Wholes Electric Co 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 Stony Brook LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Massachusetts Mun Wholes Electric Co 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 "Stony Brook LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Stony Brook still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Stony Brook

Stony Brook is a 542 MW oil-fired power plant in Hampden County, Massachusetts, operated by Massachusetts Mun Wholes Electric Co. EIA-860M lists 10 generating units here, inside ISO New England. Its units entered service between 1981 and 2018.

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: 541.5 MW; 446.6 MW net summer
Generating units: 10
In service: 1981–2018
EIA plant ID: 6081

Where it is

Loading map…

County: Hampden County, Massachusetts
Coordinates: 42.1978, -72.5106
Balancing authority: ISNE
Sector: Electric Utility

Units, technology and status

Operator of record: Massachusetts Mun Wholes Electric Co
Primary energy source: Petroleum
Technologies: Natural Gas Fired Combined Cycle, Petroleum Liquids, Solar Photovoltaic
Status: Operating (8) · Standby/Backup (2)

This site runs on more than one energy source. EIA-860M capacity splits: Petroleum 280 MW, Natural gas 255 MW, Solar 7 MW. It is filed here under Petroleum, the source with the most capacity.

Every plant Massachusetts Mun Wholes Electric Co reports to EIA →

Stony Brook: FAQ

Where is Stony Brook?: In Hampden 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 Stony Brook?: 542 MW of nameplate capacity across 10 units, as of the EIA-860M release for 2026-07.
Who owns Stony Brook?: EIA-860M names Massachusetts Mun Wholes Electric Co 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 Stony Brook LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Massachusetts Mun Wholes Electric Co 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 "Stony Brook LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Stony Brook still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.