VIENNA WIND FARM
OperatingWind power plant
- Capacity
- 103 MW
- Primary fuel
- Wind
- County
- Marshall County
- Operator
- MIDAMERICAN ENERGY CO
- Status
- Operating
- Commissioned
- 2012
- EIA plant ID
- 57874
- Generators
- 2
- Technology
- Onshore Wind Turbine
- Net generation (2024)
- 398 GWh
- Capacity factor (2024, EIA nameplate)
- 30%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 42.1861, -92.7150
VIENNA WIND FARM, a 103 MW Wind power plant in Marshall County, Iowa. Operated by MIDAMERICAN ENERGY CO, commissioned 2012.
How VIENNA WIND FARM compares
With 103 MW of capacity, VIENNA WIND FARM ranks 39th among the 198 operating power plants Bywatts maps in Iowa and 18th of the 63 operating Wind plants in the state. It accounts for about 2.0% of Iowa's operating Wind capacity and 0.7% of all operating capacity in the state. Nationally it is the 220th-largest of the 708 operating Wind plants in the database. Commissioned in 2012, it is newer than 87% of the 198 operating Iowa plants with a recorded commissioning year. Its operator, MIDAMERICAN ENERGY CO, runs 28 operating plants in Iowa totaling 8,028 MW. It shares Marshall County with 5 other operating plants, including MARSHALLTOWN and LAUREL WIND FARM.
EIA-860 lists 2 generators at the site with 150 MW of nameplate capacity, all onshore wind turbine technology (this page's HIFLD capacity figure is 103 MW). Net generation was 398 GWh in 2024 (a 30% capacity factor), down 29% from 2022. Its generators came online between 2012 and 2013.
Grid neighborhood
The closest transmission line found within 10 miles is a 161 kV line, about 0.2 miles away. Another 9 operating power plants totaling 605 MW sit within 25 miles; the largest is ELECTRIFARM (264 MW, Natural Gas).
Computed by Bywatts from HIFLD power plant and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
VIENNA WIND FARM is a 103 MW wind power plant in Marshall County, IA, operated by MIDAMERICAN ENERGY CO, commissioned in 2012. Marshall County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.4 of 5 at the 35th national percentile. Tornado is the leading peril, rated Relatively Moderate by FEMA at the 93rd 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.
Marshall County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Tornado | Relatively Moderate | 93rd | 4.7 of 5 | 0.60 |
| Heat wave | Very Low | 90th | 4.6 of 5 | 4.9 |
| Strong wind | Relatively High | 70th | 3.8 of 5 | 6.4 |
| Winter weather | Relatively Moderate | 69th | 3.7 of 5 | 15.6 |
| Wildfire | Very Low | 56th | 3.3 of 5 | <0.01 |
| Lightning | Relatively Low | 52nd | 3.1 of 5 | 43.1 |
| Ice storm | Relatively Low | 46th | 2.8 of 5 | 0.56 |
| Hail | Relatively Moderate | 42nd | 2.7 of 5 | 6.2 |
| Riverine flooding | Relatively Low | 38th | 2.5 of 5 | 2.4 |
| Earthquake | Very Low | 15th | 1.6 of 5 | <0.01 |
| Hurricane | Very Low | 4th | 1.2 of 5 | <0.01 |
Perils not assessed in Marshall 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 |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Marshall 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.