In Kennebec County, Maine (ME). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

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

EIA-860M names KEI (Maine) Power Management (III) 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 Gardiner LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — KEI (Maine) Power Management (III) 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 "Gardiner LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Gardiner still running?

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

Gardiner

Gardiner is a 1 MW hydroelectric power plant in Kennebec County, Maine, operated by KEI (Maine) Power Management (III) LLC. EIA-860M lists 1 generating unit here, inside ISO New England. Its unit entered service in 1985.

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 MW; 1 MW net summer
Generating units: 1
In service: 1985
EIA plant ID: 50688

Where it is

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County: Kennebec County, Maine
Coordinates: 44.2218, -69.7857
Balancing authority: ISNE
Sector: IPP Non-CHP

Units, technology and status

Operator of record: KEI (Maine) Power Management (III) LLC
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating

Every plant KEI (Maine) Power Management (III) LLC reports to EIA →

Gardiner: FAQ

Where is Gardiner?: In Kennebec County, Maine (ME). 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 Gardiner?: 1 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
Who owns Gardiner?: EIA-860M names KEI (Maine) Power Management (III) 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 Gardiner LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — KEI (Maine) Power Management (III) 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 "Gardiner LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Gardiner still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.