Walnut Wind Farm
Pottawattamie County, Iowa · EIA plant ID 56811 · Operator: MidAmerican Energy Co
Nameplate165MWSummer 150 MW
Generators1in service
Net generation558GWh12 mo to Dec 2025
Capacity factor42%wind units, summer MW
Heat rate—thermal plants only
First online2008
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) |
|---|---|---|---|
| 2008 | 5 | 4.4% | — |
| 2009 | 375.8 | 28.0% | — |
| 2010 | 439.7 | 32.8% | — |
| 2011 | 484.5 | 36.1% | — |
| 2012 | 511.8 | 38.1% | — |
| 2013 | 511 | 38.1% | — |
| 2014 | 474.4 | 35.4% | — |
| 2015 | 472.7 | 35.3% | — |
| 2016 | 497.2 | 37.0% | — |
| 2017 | 469.3 | 35.0% | — |
| 2018 | 431.5 | 32.2% | — |
| 2019 | 403.6 | 27.9% | — |
| 2020 | 542.1 | 37.4% | — |
| 2021 | 532.2 | 36.8% | — |
| 2022 | 634.6 | 48.3% | — |
| 2023 | 538.1 | 40.9% | — |
| 2024 | 584.1 | 44.3% | — |
| 2025 | 558.3 | 42.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| WWF | Onshore Wind Turbine | WT | 165.2 | 150 | Dec 2008 | Operating | — | ge 1.5 SLE |
Owner / operator
Operator: MidAmerican Energy Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| MidAmerican Energy Co | 100.0% | 165 MW |
Nearby plants
Within 80 km.
| Atlantic | 10 MW | 20.4 km |
| Harlan | 3 MW | 22.4 km |
| Exira | 182 MW | 27.4 km |
| Wiota | 2 MW | 30.9 km |
| Anita | 3 MW | 39.3 km |
| Heartland Divide II | 200 MW | 39.5 km |