BOYSEN
OperatingHydro power plant
- Capacity
- 15 MW
- Primary fuel
- Hydro
- County
- Fremont County
- Operator
- U S BUREAU OF RECLAMATION
- Status
- Operating
- Commissioned
- 1952
- EIA plant ID
- 505
- Coordinates
- 43.4179, -108.1776
BOYSEN, a 15 MW Hydro power plant in Fremont County, Wyoming. Operated by U S BUREAU OF RECLAMATION, commissioned 1952.
Weather peril exposure
BOYSEN is a 15 MW hydro power plant in Fremont County, WY, operated by U S BUREAU OF RECLAMATION, commissioned in 1952. Fremont County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.9 of 5 at the 22nd national percentile. Earthquake is the leading peril, rated Relatively Low by FEMA at the 88th 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.
Fremont County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Relatively Low | 88th | 4.5 of 5 | <0.01 |
| Wildfire | Relatively Moderate | 88th | 4.5 of 5 | <0.01 |
| Riverine flooding | Relatively Low | 69th | 3.7 of 5 | 1.5 |
| Hail | Relatively Low | 38th | 2.5 of 5 | 0.24 |
| Lightning | Relatively High | 37th | 2.5 of 5 | 35.1 |
| Winter weather | Relatively Moderate | 33rd | 2.3 of 5 | 18.3 |
| Ice storm | Very Low | 19th | 1.8 of 5 | 0.01 |
| Strong wind | Relatively Low | 16th | 1.6 of 5 | 0.29 |
| Heat wave | Very Low | 13th | 1.5 of 5 | 0.11 |
| Tornado | Very Low | 13th | 1.5 of 5 | 0.34 |
Perils not assessed in Fremont 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 Fremont 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.