Whispering Willow Wind Farm - East
Wind power plant in Franklin County, Iowa. 199.7 MW of nameplate capacity across 1 generator, operated by Interstate Power and Light Co.
Also known as Whispering Willow I · EIA plant 56355
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 199.7 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- December 2009First generator online
- Operator
- Interstate Power and Light CoEIA operator ID 9417
- Grid
- MISOBalancing authority MISO
- Price nodes
- 1 MISO nodeResource nodes with prices
- Location
- Franklin County, IA42.6305, −93.2064
- EIA plant ID
- 56355EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Whispering Willow Wind Farm - East produces
Free · EIA-923Net generation, 2025
405 GWh
404,628 MWh, final
Capacity factor, 2025
23.1%
2024: 24.2%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
393.1–653.1
GWh a year. Low 2021, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | 40,919 | Not reported | 3 of 12 |
| 2010 | 353,163 | 20.2% | 12 of 12 |
| 2011 | 568,237 | 32.5% | 12 of 12 |
| 2012 | 579,025 | 33.0% | 12 of 12 |
| 2013 | 639,069 | 36.5% | 12 of 12 |
| 2014 | 621,597 | 35.5% | 12 of 12 |
| 2015 | 653,103 | 37.3% | 12 of 12 |
| 2016 | 630,455 | 35.9% | 12 of 12 |
| 2017 | 626,369 | 35.8% | 12 of 12 |
| 2018 | 582,943 | 33.3% | 12 of 12 |
| 2019 | 566,024 | 32.4% | 12 of 12 |
| 2020 | 445,474 | 25.4% | 12 of 12 |
| 2021 | 393,082 | 22.5% | 12 of 12 |
| 2022 | 584,245 | 33.4% | 12 of 12 |
| 2023 | 459,373 | 26.3% | 12 of 12 |
| 2024 | 425,170 | 24.2% | 12 of 12 |
| 2025 | 404,628 | 23.1% | 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 CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Onshore Wind Turbine | 199.7 | December 2009 |
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.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Power plants near Whispering Willow Wind Farm - East
More plants operated by Interstate Power and Light Co
Questions about Whispering Willow Wind Farm - East
How much power does Whispering Willow Wind Farm - East produce?
Whispering Willow Wind Farm - East reported 404,628 MWh (405 GWh) of net generation in 2025, a 23.1% capacity factor on 199.7 MW of nameplate capacity.
Where is Whispering Willow Wind Farm - East?
Whispering Willow Wind Farm - East is in Franklin County, Iowa, at 42.6305, −93.2064. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Whispering Willow Wind Farm - East?
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 Whispering Willow Wind Farm - East start operating?
Its first generator began operating in December 2009, according to EIA-860M.
Does InfraMap have power prices for Whispering Willow Wind Farm - East?
Yes. InfraMap has MISO day-ahead and real-time prices at 1 price node linked to Whispering Willow Wind Farm - East, 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)
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Project names from the USGS U.S. Wind Turbine Database
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page