Whispering Willow North
Franklin County, Iowa · EIA plant ID 62079 · Operator: Interstate Power and Light Co
Nameplate201MWSummer 201 MW
Generators1in service
Net generation739GWh12 mo to Aug 2026
Capacity factor42%wind units, summer MW
Heat rate—thermal plants only
First online2020
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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) |
|---|---|---|---|
| 2020 | 812.1 | 45.9% | — |
| 2021 | 820.1 | 46.5% | — |
| 2022 | 884.3 | 50.1% | — |
| 2023 | 703.4 | 39.9% | — |
| 2024 | 795.5 | 45.0% | — |
| 2025 | 733.9 | 41.6% | — |
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 | 201.3 | 201.3 | Jan 2020 | Operating | — | ge 2.5-127 |
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% | 201 MW |
Nearby plants
Within 80 km.
| Alliant SBD 9502 Eaton | retired | 16.7 km |
| Hampton Substation Energy Storage | 2 MW | 18.1 km |
| Franklin County Solar | 7 MW | 18.3 km |
| Franklin County Wind Farm | 99 MW | 19.9 km |
| Whispering Willow Wind Farm - East | 200 MW | 23.6 km |
| Century | 201 MW | 29.5 km |