Where is Mosinee Mill?

In Marathon 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 Mosinee Mill?

23 MW of nameplate capacity across 5 units, as of the EIA-860M release for 2026-07.

Who owns Mosinee Mill?

EIA-860M names Ahlstrom-Munksjo NA Specialty Solutions, 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 Mosinee Mill LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Ahlstrom-Munksjo NA Specialty Solutions, 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 "Mosinee Mill LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Mosinee Mill still running?

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

Mosinee Mill

Mosinee Mill is a 23 MW biomass power plant in Marathon County, Wisconsin, operated by Ahlstrom-Munksjo NA Specialty Solutions, LLC. EIA-860M lists 5 generating units here, inside MISO. Its units entered service between 1916 and 1976.

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: 23.4 MW; 21.9 MW net summer
Generating units: 5
In service: 1916–1976
EIA plant ID: 50614

Where it is

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County: Marathon County, Wisconsin
Coordinates: 44.7881, -89.6917
Balancing authority: MISO
Sector: Industrial CHP

Units, technology and status

Operator of record: Ahlstrom-Munksjo NA Specialty Solutions, LLC
Primary energy source: Biomass
Technologies: Conventional Hydroelectric, Wood/Wood Waste Biomass
Status: Operating

This site runs on more than one energy source. EIA-860M capacity splits: Biomass 20 MW, Hydro 3 MW. It is filed here under Biomass, the source with the most capacity.

Every plant Ahlstrom-Munksjo NA Specialty Solutions, LLC reports to EIA →

Mosinee Mill: FAQ

Where is Mosinee Mill?: In Marathon 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 Mosinee Mill?: 23 MW of nameplate capacity across 5 units, as of the EIA-860M release for 2026-07.
Who owns Mosinee Mill?: EIA-860M names Ahlstrom-Munksjo NA Specialty Solutions, 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 Mosinee Mill LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Ahlstrom-Munksjo NA Specialty Solutions, 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 "Mosinee Mill LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Mosinee Mill still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.