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23.4 MW Conventional Hydroelectric (3 MW) + Wood/Wood Waste Biomass (20 MW) operating in Marathon, WI
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
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| 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
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
46.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Industrial
Sector
Industrial CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
11.2K MWh
Latest Month
118.0K MWh
Annual Generation
57.6%
Capacity Factor
Forward-looking generation outlook with probabilistic ranges across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.
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CO₂ Intensity
530 lb/MWh
NOx
2 lb/MWh
SO₂
6 lb/MWh
CH₄
0.091 lb/MWh
N₂O
0.023 lb/MWh
Capacity Factor
58.1%
Annual Net Gen
119 GWh
CO₂eq
538 lb/MWh
Subregion
MRO East
2013
$3,495/kW
Est. Construction Cost
Total estimated cost: $81.8M
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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Market Position
ISO/RTO Market
MISO
LMP Node
—
Pricing Hub
MICHIGAN.HUB
Alt. Hub / Zone
MINN.HUB
Node Source
OSM spatial match
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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