GEM STATE
OperatingHydro power plant
- Capacity
- 23 MW
- Primary fuel
- Hydro
- County
- Bonneville County
- Operator
- CITY OF IDAHO FALLS - (ID)
- Status
- Operating
- Commissioned
- 1988
- EIA plant ID
- 790
- Coordinates
- 43.4201, -112.1015
GEM STATE, a 23 MW Hydro power plant in Bonneville County, Idaho. Operated by CITY OF IDAHO FALLS - (ID), commissioned 1988.
Weather peril exposure
GEM STATE is a 23 MW hydro power plant in Bonneville County, ID, operated by CITY OF IDAHO FALLS - (ID), commissioned in 1988. Bonneville County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.6 of 5 at the 64th national percentile. Wildfire is the leading peril, rated Relatively Moderate by FEMA at the 94th 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.
Bonneville County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Wildfire | Relatively Moderate | 94th | 4.8 of 5 | <0.01 |
| Earthquake | Relatively Moderate | 92nd | 4.7 of 5 | 0.03 |
| Hail | Relatively Moderate | 70th | 3.8 of 5 | 0.43 |
| Riverine flooding | Relatively Moderate | 53rd | 3.1 of 5 | 0.61 |
| Heat wave | Relatively Moderate | 45th | 2.8 of 5 | 0.65 |
| Lightning | Relatively High | 31st | 2.2 of 5 | 36.0 |
| Ice storm | Very Low | 17th | 1.7 of 5 | 0.01 |
| Strong wind | Relatively Low | 13th | 1.5 of 5 | 0.76 |
| Tornado | Very Low | 11th | 1.4 of 5 | 0.18 |
| Winter weather | Relatively Moderate | 3rd | 1.1 of 5 | 24.3 |
Perils not assessed in Bonneville 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 Bonneville 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.