WALNUT WIND FARM
OperatingWind power plant
- Capacity
- 153 MW
- Primary fuel
- Wind
- County
- Pottawattamie County
- Operator
- MIDAMERICAN ENERGY CO
- Status
- Operating
- Commissioned
- 2008
- EIA plant ID
- 56811
- Coordinates
- 41.4517, -95.2383
WALNUT WIND FARM, a 153 MW Wind power plant in Pottawattamie County, Iowa. Operated by MIDAMERICAN ENERGY CO, commissioned 2008.
Weather peril exposure
WALNUT WIND FARM is a 153 MW wind power plant in Pottawattamie County, IA, operated by MIDAMERICAN ENERGY CO, commissioned in 2008. Pottawattamie County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.5 of 5 at the 86th national percentile. Tornado is the leading peril, rated Relatively High by FEMA at the 98th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a wind plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Pottawattamie County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Tornado | Relatively High | 98th | 4.9 of 5 | 0.82 |
| Heat wave | Relatively Moderate | 95th | 4.8 of 5 | 7.8 |
| Hail | Relatively High | 88th | 4.5 of 5 | 6.6 |
| Ice storm | Relatively Moderate | 79th | 4.1 of 5 | 0.91 |
| Strong wind | Relatively High | 77th | 4.1 of 5 | 4.6 |
| Winter weather | Relatively Moderate | 70th | 3.8 of 5 | 14.1 |
| Riverine flooding | Relatively Moderate | 67th | 3.7 of 5 | 1.3 |
| Lightning | Relatively Moderate | 63rd | 3.5 of 5 | 45.6 |
| Wildfire | Relatively Low | 53rd | 3.1 of 5 | <0.01 |
| Earthquake | Very Low | 12th | 1.5 of 5 | <0.01 |
Perils not assessed in Pottawattamie County
These perils carry no usable National Risk Index figure for this county, so they are excluded from the scoring rather than scored zero. A zero would claim the peril was assessed and found benign.
| Peril | Why it is not scored |
|---|---|
| Hurricane | FEMA rating is "No Rating" for this county |
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Pottawattamie County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.