WEBSTER
OperatingPower plant
- County
- Day County
- Operator
- NORTHWESTERN ENERGY - (SD)
- Status
- Operating
- EIA plant ID
- 3348
- Coordinates
- 45.3304, -97.5140
WEBSTER, a power plant in Day County, South Dakota. Operated by NORTHWESTERN ENERGY - (SD). One of 36 power plants tracked in South Dakota on Bywatts.
Weather peril exposure
WEBSTER is a power plant in Day County, SD, operated by NORTHWESTERN ENERGY - (SD). Day County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.8 of 5 at the 45th national percentile. Winter weather 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 this plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Day County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Winter weather | Relatively Moderate | 97th | 4.9 of 5 | 22.6 |
| Ice storm | Relatively Moderate | 85th | 4.4 of 5 | 0.51 |
| Heat wave | Very Low | 81st | 4.3 of 5 | 2.5 |
| Wildfire | Relatively Low | 78th | 4.1 of 5 | <0.01 |
| Strong wind | Relatively Moderate | 76th | 4.1 of 5 | 2.9 |
| Tornado | Relatively Low | 71st | 3.9 of 5 | 0.59 |
| Hail | Relatively Low | 52nd | 3.1 of 5 | 4.0 |
| Lightning | Very Low | 30th | 2.2 of 5 | 32.5 |
| Earthquake | Very Low | 13th | 1.5 of 5 | <0.01 |
| Riverine flooding | Very Low | 11th | 1.4 of 5 | 1.1 |
Perils not assessed in Day 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 Day 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.