WANAPUM
OperatingHydro power plant
- Capacity
- 989 MW
- Primary fuel
- Hydro
- County
- Grant County
- Operator
- PUD NO 2 OF GRANT COUNTY
- Status
- Operating
- Commissioned
- 2011
- EIA plant ID
- 3888
- Coordinates
- 46.8757, -119.9709
WANAPUM, a 989 MW Hydro power plant in Grant County, Washington. Operated by PUD NO 2 OF GRANT COUNTY, commissioned 2011.
Weather peril exposure
WANAPUM is a 989 MW hydro power plant in Grant County, WA, operated by PUD NO 2 OF GRANT COUNTY, commissioned in 2011. Grant County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.1 of 5 at the 2nd national percentile. Wildfire is the leading peril, rated Relatively Moderate by FEMA at the 93rd 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.
Grant County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Wildfire | Relatively Moderate | 93rd | 4.7 of 5 | <0.01 |
| Earthquake | Relatively Low | 83rd | 4.3 of 5 | <0.01 |
| Heat wave | Relatively Moderate | 63rd | 3.5 of 5 | 4.7 |
| Riverine flooding | Relatively Moderate | 22nd | 1.9 of 5 | 0.36 |
| Winter weather | Relatively Moderate | 17th | 1.7 of 5 | 9.7 |
| Lightning | Relatively Low | 10th | 1.4 of 5 | 9.2 |
| Strong wind | Relatively Low | 10th | 1.4 of 5 | 0.17 |
| Tornado | Very Low | 6th | 1.2 of 5 | 0.10 |
| Hail | Relatively Low | 2nd | 1.1 of 5 | 0.11 |
| Ice storm | Very Low | 0th | 1.0 of 5 | 0.01 |
Perils not assessed in Grant 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 Grant 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.