DIAMOND WILLOW WIND FACILITY
OperatingWind power plant
- Capacity
- 30 MW
- Primary fuel
- Wind
- County
- Fallon County
- Operator
- MONTANA-DAKOTA UTILITIES CO
- Status
- Operating
- Commissioned
- 2007
- EIA plant ID
- 56782
- Coordinates
- 46.2748, -104.1825
DIAMOND WILLOW WIND FACILITY, a 30 MW Wind power plant in Fallon County, Montana. Operated by MONTANA-DAKOTA UTILITIES CO, commissioned 2007.
Weather peril exposure
DIAMOND WILLOW WIND FACILITY is a 30 MW wind power plant in Fallon County, MT, operated by MONTANA-DAKOTA UTILITIES CO, commissioned in 2007. Fallon County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.2 of 5 at the 55th national percentile. Winter weather is the leading peril, rated Relatively Low by FEMA at the 99th 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.
Fallon County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Winter weather | Relatively Low | 99th | 5.0 of 5 | 16.3 |
| Heat wave | Very Low | 95th | 4.8 of 5 | 1.9 |
| Wildfire | Very Low | 86th | 4.4 of 5 | <0.01 |
| Hail | Very Low | 63rd | 3.5 of 5 | 2.2 |
| Ice storm | Very Low | 62nd | 3.5 of 5 | 0.16 |
| Strong wind | Very Low | 54th | 3.2 of 5 | 1.3 |
| Riverine flooding | Very Low | 34th | 2.4 of 5 | 0.43 |
| Tornado | Very Low | 30th | 2.2 of 5 | 0.18 |
| Lightning | Very Low | 30th | 2.2 of 5 | 32.1 |
| Earthquake | Very Low | 21st | 1.8 of 5 | <0.01 |
Perils not assessed in Fallon 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 "Not Applicable" for this county |
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Fallon 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.