HOLTER
OperatingHydro power plant
- Capacity
- 38 MW
- Primary fuel
- Hydro
- County
- Cascade County
- Operator
- PPL MONTANA LLC
- Status
- Operating
- Commissioned
- 1918
- EIA plant ID
- 2186
- Coordinates
- 46.9908, -112.0056
HOLTER, a 38 MW Hydro power plant in Cascade County, Montana. Operated by PPL MONTANA LLC, commissioned 1918.
Weather peril exposure
HOLTER is a 38 MW hydro power plant in Cascade County, MT, operated by PPL MONTANA LLC, commissioned in 1918. Cascade County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.9 of 5 at the 22nd national percentile. Riverine flooding is the leading peril, rated Relatively Moderate by FEMA at the 82nd 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.
Cascade County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Riverine flooding | Relatively Moderate | 82nd | 4.3 of 5 | 0.75 |
| Wildfire | Relatively Low | 76th | 4.0 of 5 | <0.01 |
| Earthquake | Relatively Low | 60th | 3.4 of 5 | <0.01 |
| Winter weather | Very High | 55th | 3.2 of 5 | 45.7 |
| Hail | Relatively Low | 39th | 2.6 of 5 | 1.0 |
| Heat wave | Relatively Low | 36th | 2.4 of 5 | 1.1 |
| Ice storm | Very Low | 18th | 1.7 of 5 | 0.01 |
| Lightning | Relatively Moderate | 16th | 1.6 of 5 | 25.1 |
| Tornado | Very Low | 16th | 1.6 of 5 | 0.13 |
| Strong wind | Relatively Moderate | 9th | 1.4 of 5 | 0.70 |
Perils not assessed in Cascade 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 Cascade 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.