In Rusk County, Wisconsin (WI). 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 Thornapple?

1 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.

EIA-860M names Northern States Power Co - Minnesota 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 Thornapple LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Northern States Power Co - Minnesota 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 "Thornapple LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Thornapple still running?

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

Thornapple

Thornapple is a 1 MW hydroelectric power plant in Rusk County, Wisconsin, operated by Northern States Power Co - Minnesota. EIA-860M lists 2 generating units here, inside MISO. Its units entered service between 1927 and 1929.

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: 1.4 MW; 0.8 MW net summer
Generating units: 2
In service: 1927–1929
EIA plant ID: 3988

Where it is

Loading map…

County: Rusk County, Wisconsin
Coordinates: 45.4111, -91.2183
Balancing authority: MISO
Sector: Electric Utility

Units, technology and status

Operator of record: Northern States Power Co - Minnesota
Primary energy source: Hydro
Technologies: Conventional Hydroelectric
Status: Operating

Every plant Northern States Power Co - Minnesota reports to EIA →

Thornapple: FAQ

Where is Thornapple?: In Rusk County, Wisconsin (WI). 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 Thornapple?: 1 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
Who owns Thornapple?: EIA-860M names Northern States Power Co - Minnesota 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 Thornapple LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Northern States Power Co - Minnesota 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 "Thornapple LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Thornapple still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.