MOUNTAIN ISLAND
OperatingHydro power plant
- Capacity
- 60 MW
- Primary fuel
- Hydro
- County
- Gaston County
- Operator
- DUKE ENERGY CAROLINAS, LLC
- Status
- Operating
- Commissioned
- 1923
- EIA plant ID
- 2728
- Coordinates
- 35.3341, -80.9866
MOUNTAIN ISLAND, a 60 MW Hydro power plant in Gaston County, North Carolina. Operated by DUKE ENERGY CAROLINAS, LLC, commissioned 1923.
Weather peril exposure
MOUNTAIN ISLAND is a 60 MW hydro power plant in Gaston County, NC, operated by DUKE ENERGY CAROLINAS, LLC, commissioned in 1923. Gaston County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.8 of 5 at the 21st national percentile. Ice storm is the leading peril, rated Very High by FEMA at the 88th 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.
Gaston County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Ice storm | Very High | 88th | 4.5 of 5 | 2.1 |
| Earthquake | Relatively Low | 70th | 3.8 of 5 | <0.01 |
| Lightning | Relatively High | 60th | 3.4 of 5 | 52.2 |
| Hurricane | Relatively Low | 55th | 3.2 of 5 | 0.07 |
| Tornado | Relatively High | 53rd | 3.1 of 5 | 0.19 |
| Riverine flooding | Relatively Moderate | 48th | 2.9 of 5 | 0.93 |
| Hail | Relatively Low | 31st | 2.2 of 5 | 5.1 |
| Wildfire | Very Low | 20th | 1.8 of 5 | <0.01 |
| Heat wave | Relatively Low | 16th | 1.6 of 5 | 2.1 |
| Strong wind | Relatively High | 11th | 1.5 of 5 | 2.7 |
| Winter weather | Relatively Low | 6th | 1.2 of 5 | 5.4 |
Perils not assessed in Gaston 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 Gaston 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.