YELLOWTAIL
OperatingHydro power plant
- Capacity
- 250 MW
- Primary fuel
- Hydro
- County
- Big Horn County
- Operator
- U S BUREAU OF RECLAMATION
- Status
- Operating
- Commissioned
- 1966
- EIA plant ID
- 2204
- Coordinates
- 45.3072, -107.9581
YELLOWTAIL, a 250 MW Hydro power plant in Big Horn County, Montana. Operated by U S BUREAU OF RECLAMATION, commissioned 1966.
Weather peril exposure
YELLOWTAIL is a 250 MW hydro power plant in Big Horn County, MT, operated by U S BUREAU OF RECLAMATION, commissioned in 1966. Big Horn County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.2 of 5 at the 56th national percentile. Wildfire is the leading peril, rated Relatively Moderate by FEMA at the 97th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a hydro plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Big Horn County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Wildfire | Relatively Moderate | 97th | 4.9 of 5 | <0.01 |
| Riverine flooding | Relatively Low | 84th | 4.4 of 5 | 0.68 |
| Hail | Relatively Low | 62nd | 3.5 of 5 | 1.6 |
| Heat wave | Very Low | 49th | 3.0 of 5 | 2.0 |
| Earthquake | Very Low | 44th | 2.8 of 5 | <0.01 |
| Lightning | Relatively High | 28th | 2.1 of 5 | 32.4 |
| Ice storm | Very Low | 21st | 1.8 of 5 | 0.01 |
| Winter weather | Relatively High | 18th | 1.7 of 5 | 24.4 |
| Tornado | Very Low | 16th | 1.6 of 5 | 0.32 |
| Strong wind | Relatively High | 7th | 1.3 of 5 | 0.83 |
Perils not assessed in Big Horn 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 Big Horn 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.