Alliant Energy Neenah
Natural gas power plant in Winnebago County, Wisconsin. 371 MW of nameplate capacity across 2 generators, operated by Wisconsin Power & Light Co.
Also known as Alliant Energy Neenah Power Plant · EIA plant 55135
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 371 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- May 2000First generator online
- Operator
- Wisconsin Power & Light CoEIA operator ID 20856
- Grid
- MISOBalancing authority MISO
- Price nodes
- 2 MISO nodesResource nodes with prices
- Location
- Winnebago County, WI44.1936, −88.5064
- EIA plant ID
- 55135EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Alliant Energy Neenah produces
Free · EIA-923Net generation, 2025
483 GWh
482,736 MWh, final
Capacity factor, 2025
Not reported
2024: 22.7%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2016 to 2025
236.3–739.9
GWh a year. Low 2018, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 158,453 | Not reported | 12 of 12 |
| 2001 | 239,995 | Not reported | 12 of 12 |
| 2002 | 298,577 | Not reported | 12 of 12 |
| 2003 | 186,312 | Not reported | 12 of 12 |
| 2004 | 55,782 | Not reported | 12 of 12 |
| 2005 | 437,298 | Not reported | 12 of 12 |
| 2006 | 115,718 | Not reported | 12 of 12 |
| 2007 | 103,997 | Not reported | 12 of 12 |
| 2008 | 25,848 | Not reported | 12 of 12 |
| 2009 | 19,149 | Not reported | 12 of 12 |
| 2010 | 14,060 | 0.4% | 12 of 12 |
| 2011 | 30,786 | 0.9% | 12 of 12 |
| 2012 | 103,180 | 3.2% | 12 of 12 |
| 2013 | 78,924 | 2.4% | 12 of 12 |
| 2014 | 50,809 | 1.6% | 12 of 12 |
| 2015 | 99,384 | 3.3% | 11 of 12 |
| 2016 | 275,003 | 8.4% | 12 of 12 |
| 2017 | 362,150 | 11.1% | 12 of 12 |
| 2018 | 236,325 | 7.3% | 12 of 12 |
| 2019 | 299,592 | 9.2% | 12 of 12 |
| 2020 | 412,896 | 12.7% | 12 of 12 |
| 2021 | 463,276 | 14.3% | 12 of 12 |
| 2022 | 500,169 | 15.4% | 12 of 12 |
| 2023 | 610,066 | 18.8% | 12 of 12 |
| 2024 | 739,903 | 22.7% | 12 of 12 |
| 2025 | 482,736 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · MISOEmissions
Free · EPA CAMPDCO₂, 2025
325,988
US short tons. 2024: 496,585
SO₂, 2025
2
US short tons
NOx, 2025
141
US short tons
CO₂ per MWh, calculated
0.68 t
About 1,351 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (CT01, CT02), matched to EIA plant 55135 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CT01 | Natural Gas Fired Combustion Turbine | 185.5 | May 2000 |
| CT02 | Natural Gas Fired Combustion Turbine | 185.5 | May 2000 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Wisconsin Power & Light Co as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Alliant Energy Neenah
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Questions about Alliant Energy Neenah
How much power does Alliant Energy Neenah produce?
Alliant Energy Neenah reported 482,736 MWh (483 GWh) of net generation in 2025.
Where is Alliant Energy Neenah?
Alliant Energy Neenah is in Winnebago County, Wisconsin, at 44.1936, −88.5064. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Alliant Energy Neenah?
EIA-860M for August 2026 lists Wisconsin Power & Light Co as the operator (EIA operator ID 20856). The operator is not always the owner.
When did Alliant Energy Neenah start operating?
Its first generator began operating in May 2000, according to EIA-860M.
Does InfraMap have power prices for Alliant Energy Neenah?
Yes. InfraMap has MISO day-ahead and real-time prices at 2 price nodes linked to Alliant Energy Neenah, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page