Whispering Willow Wind Farm - East
Franklin County, Iowa · EIA plant ID 56355 · Operator: Interstate Power and Light Co
Nameplate200MWSummer 200 MW
Generators1in service
Net generation405GWh12 mo to Dec 2025
Capacity factor23%wind units, summer MW
Heat rate—thermal plants only
First online2009
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), wind units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2009 | 40.9 | 27.5% | — |
| 2010 | 353.2 | 20.2% | — |
| 2011 | 568.2 | 32.5% | — |
| 2012 | 579 | 33.0% | — |
| 2013 | 639.1 | 36.5% | — |
| 2014 | 621.6 | 35.5% | — |
| 2015 | 653.1 | 37.3% | — |
| 2016 | 630.5 | 35.9% | — |
| 2017 | 626.4 | 35.8% | — |
| 2018 | 582.9 | 33.3% | — |
| 2019 | 566 | 32.4% | — |
| 2020 | 445.5 | 25.4% | — |
| 2021 | 393.1 | 22.5% | — |
| 2022 | 584.2 | 33.4% | — |
| 2023 | 459.4 | 26.3% | — |
| 2024 | 425.2 | 24.2% | — |
| 2025 | 404.6 | 23.1% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Onshore Wind Turbine | WT | 199.7 | 199.7 | Dec 2009 | Operating | — | vestas V82-1.65 |
Owner / operator
Operator: Interstate Power and Light Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Interstate Power and Light Co | 100.0% | 200 MW |
Nearby plants
Within 80 km.
| Hampton Substation Energy Storage | 2 MW | 6.6 km |
| Franklin County Solar | 7 MW | 10 km |
| Franklin County Wind Farm | 99 MW | 11 km |
| Leonardo Wind 1 LLC | 3 MW | 19.8 km |
| Whispering Willow North | 201 MW | 23.6 km |
| Wellsburg Wind Project | 141 MW | 33.1 km |