99 ISLANDS
OperatingHydro power plant
- Capacity
- 18 MW
- Primary fuel
- Hydro
- County
- Cherokee County
- Operator
- DUKE ENERGY CAROLINAS, LLC
- Status
- Operating
- Commissioned
- 1910
- EIA plant ID
- 3272
- Coordinates
- 35.0318, -81.4935
99 ISLANDS, an 18 MW Hydro power plant in Cherokee County, South Carolina. Operated by DUKE ENERGY CAROLINAS, LLC, commissioned 1910.
Weather peril exposure
99 ISLANDS is an 18 MW hydro power plant in Cherokee County, SC, operated by DUKE ENERGY CAROLINAS, LLC, commissioned in 1910. Cherokee County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.9 of 5 at the 24th national percentile. Lightning is the leading peril, rated Relatively Moderate by FEMA at the 95th 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.
Cherokee County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Lightning | Relatively Moderate | 95th | 4.8 of 5 | 53.0 |
| Ice storm | Relatively High | 87th | 4.5 of 5 | 2.1 |
| Earthquake | Relatively Low | 69th | 3.7 of 5 | <0.01 |
| Hurricane | Relatively Low | 64th | 3.5 of 5 | 0.06 |
| Tornado | Relatively Moderate | 51st | 3.0 of 5 | 0.24 |
| Riverine flooding | Relatively Low | 50th | 3.0 of 5 | 0.39 |
| Wildfire | Very Low | 35th | 2.4 of 5 | <0.01 |
| Hail | Relatively Low | 32nd | 2.3 of 5 | 5.6 |
| Strong wind | Relatively Moderate | 31st | 2.3 of 5 | 3.1 |
| Heat wave | Relatively Low | 14th | 1.6 of 5 | 1.7 |
| Winter weather | Relatively Low | 6th | 1.2 of 5 | 4.4 |
Perils not assessed in Cherokee 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 |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Cherokee 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.