Where is Deer Island Treatment Plant?

In Suffolk 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 Deer Island Treatment Plant?

73 MW of nameplate capacity across 8 units, as of the EIA-860M release for 2026-07.

Who owns Deer Island Treatment Plant?

EIA-860M names Massachusetts Wtr Rauth-Deer I 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 Deer Island Treatment Plant LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Massachusetts Wtr Rauth-Deer I 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 "Deer Island Treatment Plant LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Deer Island Treatment Plant still running?

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

Deer Island Treatment Plant

Deer Island Treatment Plant is a 73 MW oil-fired power plant in Suffolk County, Massachusetts, operated by Massachusetts Wtr Rauth-Deer I. EIA-860M lists 8 generating units here, inside ISO New England. Its units entered service between 1995 and 2009.

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: 72.8 MW; 56.3 MW net summer
Generating units: 8
In service: 1995–2009
EIA plant ID: 10823

Where it is

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County: Suffolk County, Massachusetts
Coordinates: 42.3533, -70.9628
Balancing authority: ISNE
Sector: Commercial CHP

Units, technology and status

Operator of record: Massachusetts Wtr Rauth-Deer I
Primary energy source: Petroleum
Technologies: Conventional Hydroelectric, Onshore Wind Turbine, Other Waste Biomass, Petroleum Liquids, Solar Photovoltaic
Status: Operating (6) · Standby/Backup (2)

This site runs on more than one energy source. EIA-860M capacity splits: Petroleum 52 MW, Biomass 18 MW, Hydro 2 MW, Wind 1 MW, Solar 0 MW. It is filed here under Petroleum, the source with the most capacity.

Every plant Massachusetts Wtr Rauth-Deer I reports to EIA →

Deer Island Treatment Plant: FAQ

Where is Deer Island Treatment Plant?: In Suffolk 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 Deer Island Treatment Plant?: 73 MW of nameplate capacity across 8 units, as of the EIA-860M release for 2026-07.
Who owns Deer Island Treatment Plant?: EIA-860M names Massachusetts Wtr Rauth-Deer I 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 Deer Island Treatment Plant LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Massachusetts Wtr Rauth-Deer I 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 "Deer Island Treatment Plant LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Deer Island Treatment Plant still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.