Where is Diamond Island Plant?

In Jefferson County, New York (NY). 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 Diamond Island Plant?

1 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.

Who owns Diamond Island Plant?

EIA-860M names Energen Renewables, 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 Diamond Island Plant LLC?

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

Is Diamond Island Plant still running?

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

Diamond Island Plant

Diamond Island Plant is a 1 MW hydroelectric power plant in Jefferson County, New York, operated by Energen Renewables, LLC. EIA-860M lists 3 generating units here, inside NYISO. Its units entered service in 1914.

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: 1.2 MW; 1.2 MW net summer
Generating units: 3
In service: 1914
EIA plant ID: 10540

Where it is

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County: Jefferson County, New York
Coordinates: 43.9786, -75.8861
Balancing authority: NYIS
Sector: IPP Non-CHP

Units, technology and status

Operator of record: Energen Renewables, LLC
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating

Every plant Energen Renewables, LLC reports to EIA →

Diamond Island Plant: FAQ

Where is Diamond Island Plant?: In Jefferson County, New York (NY). 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 Diamond Island Plant?: 1 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.
Who owns Diamond Island Plant?: EIA-860M names Energen Renewables, 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 Diamond Island Plant LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Energen Renewables, 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 "Diamond Island Plant LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Diamond Island Plant still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.