Marshalltown
Natural gas power plant in Marshall County, Iowa. 189 MW of nameplate capacity across 3 generators, operated by Interstate Power and Light Co.
Also known as Marshalltown Power Station · EIA plant 1068
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 189 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- June 1978First generator online
- Operator
- Interstate Power and Light CoEIA operator ID 9417
- Grid
- MISOBalancing authority MISO
- Price nodes
- 3 MISO nodesResource nodes with prices
- Location
- Marshall County, IA42.0474, −92.8594
- EIA plant ID
- 1068EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Marshalltown produces
Free · EIA-923Net generation, 2025
20.3 GWh
20,255 MWh, final
Capacity factor, 2025
1.2%
2024: 4.8%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
2.2–122.1
GWh a year. Low 2015, high 2023
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 25,965 | Not reported | 12 of 12 |
| 2001 | 21,017 | Not reported | 12 of 12 |
| 2002 | 11,850 | Not reported | 12 of 12 |
| 2003 | 20,180 | Not reported | 12 of 12 |
| 2004 | 18,472 | Not reported | 12 of 12 |
| 2005 | 46,947 | Not reported | 12 of 12 |
| 2006 | 28,647 | Not reported | 12 of 12 |
| 2007 | 54,620 | Not reported | 12 of 12 |
| 2008 | 9,730 | Not reported | 12 of 12 |
| 2009 | 13,269 | Not reported | 12 of 12 |
| 2010 | 17,803 | 1.0% | 12 of 12 |
| 2011 | 14,096 | Not reported | 12 of 12 |
| 2012 | 30,069 | 1.8% | 12 of 12 |
| 2013 | 18,277 | 1.1% | 12 of 12 |
| 2014 | 9,729 | 0.6% | 12 of 12 |
| 2015 | 2,157 | 0.1% | 12 of 12 |
| 2016 | 3,095 | 0.2% | 12 of 12 |
| 2017 | 17,911 | Not reported | 12 of 12 |
| 2018 | 30,809 | 1.9% | 12 of 12 |
| 2019 | 29,934 | 1.8% | 12 of 12 |
| 2020 | 48,735 | 2.9% | 12 of 12 |
| 2021 | 88,139 | 5.3% | 12 of 12 |
| 2022 | 71,850 | 4.3% | 12 of 12 |
| 2023 | 122,111 | 7.4% | 12 of 12 |
| 2024 | 79,031 | 4.8% | 12 of 12 |
| 2025 | 20,255 | 1.2% | 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
Not reported
US short tons. 2024: Not reported
SO₂, 2025
0
US short tons
NOx, 2025
36
US short tons
0 of 6 EPA units reported CO₂ in 2025 (1A, 1B, 2A, 2B, 3A, 3B), matched to EIA plant 1068 through the EPA–EIA crosswalk.
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 |
|---|---|---|---|
| 1 | Natural Gas Fired Combustion Turbine | 63.0 | June 1978 |
| 2 | Natural Gas Fired Combustion Turbine | 63.0 | June 1978 |
| 3 | Natural Gas Fired Combustion Turbine | 63.0 | July 1978 |
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 Interstate Power and 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 Marshalltown
More plants operated by Interstate Power and Light Co
Questions about Marshalltown
How much power does Marshalltown produce?
Marshalltown reported 20,255 MWh (20.3 GWh) of net generation in 2025, a 1.2% capacity factor on 189 MW of nameplate capacity.
Where is Marshalltown?
Marshalltown is in Marshall County, Iowa, at 42.0474, −92.8594. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Marshalltown?
EIA-860M for August 2026 lists Interstate Power and Light Co as the operator (EIA operator ID 9417). The operator is not always the owner.
When did Marshalltown start operating?
Its first generator began operating in June 1978, according to EIA-860M.
Does InfraMap have power prices for Marshalltown?
Yes. InfraMap has MISO day-ahead and real-time prices at 3 price nodes linked to Marshalltown, 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