23.4 MW Conventional Hydroelectric (3 MW) + Wood/Wood Waste Biomass (20 MW) operating in Marathon, WI — Midcontinent Independent Transmission System Operator, Inc..
23.4 MW
Nameplate Capacity
5
Generators
units
Hybrid (2)
Technology
Conventional Hydroelectric + Wood/Wood Waste Biomass
1916
Operating Since
Coordinates
44.7881, -89.6917
County
Marathon, WI
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Ahlstrom-Munksjo NA Specialty Solutions, LLC | Ahlstrom-Munksjo NA Specialty Solutions LLC | — |
| Owner(s) | Ahlstrom-Munksjo NA Specialty Solutions, LLC | Bain Capital | — |
| Status | Operating | operating | — |
The Mosinee Mill is a hybrid power plant located in Marathon County, Wisconsin. It has a total capacity of 23.4 MW across 5 generators, utilizing both conventional hydroelectric and wood/wood waste biomass technologies. The plant began operating in 1916 and is owned by Bain Capital, with Ahlstrom-Munksjo NA Specialty Solutions, LLC as the listed operator per EIA data. The primary fuel source is listed as WAT (waste).
The plant operates within the Midcontinent Independent Transmission System Operator, Inc. (MISO) balancing authority and the MRO NERC region. In the most recent year with available data, the Mosinee Mill generated 117,962 MWh, achieving a capacity factor of 57.6%. The plant is ranked 7th out of 65 power plants in Wisconsin and 456th out of 1464 nationally.
Generated from EIA, GEM, and public data sources
NERC Region
MRO
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
46 kV
Regulatory Status
NR
Entity Type
Industrial
Sector
Industrial CHP
11.2K MWh
Latest Month
118.0K MWh
Annual Generation
57.6%
Capacity Factor
No financial data available for this plant.
Market Position
ISO/RTO Market
MISO
LMP Node
—
Pricing Hub
MICHIGAN.HUB
Node Source
OSM spatial match
Ahlstrom to close Mosinee pulp mill, impacting more than 200 workers
The company filed a notice on Feb. 27, saying it was planning on laying off 28 workers but the number could be greater.
Ahlstrom to close, idle part of Mosinee facility
MOSINEE, Wis (WAOW) - Ahlstrom, the owner of the Mosinee paper mill, announced Wednesday plans to close and idle part of it's facility on...
Ahlstrom to downsize Mosinee paper mill, putting about 200 jobs at risk
By Shereen Siewert | Wausau Pilot & Review Editor's note: This version contains a correction about which paper machine will close on each...
Ahlstrom’s Mosinee plant announces closure of two paper machines, pulp mill
Ahlstrom announced Thursday it will close two of its four paper machines and the pulp mill at its Mosinee facility.
Last updated 2026-03-14
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