KAPSTONE
Retired 2023Biomass power plant
- Capacity
- 99 MW
- Primary fuel
- Biomass
- County
- Charleston County
- Operator
- SOUTH CAROLINA ELECTRIC&GAS CO
- EIA plant ID
- 7737
- Coordinates
- 32.9000, -79.9667
KAPSTONE, a retired 99 MW Biomass power plant in Charleston County, South Carolina. It was retired in 2023, according to EIA-860.
How KAPSTONE compares
It was retired in 2023 according to EIA-860, so it is not counted in South Carolina's operating fleet. Its operator, SOUTH CAROLINA ELECTRIC&GAS CO, runs 12 operating plants in South Carolina totaling 5,236 MW. It shares Charleston County with one other operating plant, HAGOOD.
Grid neighborhood
The closest transmission line found within 10 miles is a 115 kV line owned by SOUTH CAROLINA ELECTRIC&GAS CO, under 0.1 miles away. Another 4 operating power plants totaling 1,108 MW sit within 25 miles; the largest is WILLIAMS (687 MW, Coal).
Computed by Bywatts from HIFLD power plant and transmission line records and EIA-860 retirement records; distances are straight-line. Sources and methodology
Weather peril exposure
KAPSTONE is a retired 99 MW biomass power plant in Charleston County, SC, formerly operated by SOUTH CAROLINA ELECTRIC&GAS CO. Charleston County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.5 of 5 at the 86th national percentile. Hurricane is the leading peril, rated Very High by FEMA at the 98th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a biomass plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Charleston County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hurricane | Very High | 98th | 4.9 of 5 | 0.34 |
| Earthquake | Relatively High | 96th | 4.8 of 5 | <0.01 |
| Coastal flooding | Very High | 75th | 4.0 of 5 | 3.6 |
| Ice storm | Relatively High | 70th | 3.8 of 5 | 0.88 |
| Wildfire | Relatively Moderate | 68th | 3.7 of 5 | <0.01 |
| Heat wave | Relatively Moderate | 44th | 2.7 of 5 | 9.6 |
| Winter weather | Relatively Moderate | 36th | 2.4 of 5 | 0.95 |
| Lightning | Relatively High | 20th | 1.8 of 5 | 63.3 |
| Tornado | Relatively Moderate | 13th | 1.5 of 5 | 0.49 |
| Riverine flooding | Relatively Moderate | 6th | 1.2 of 5 | 3.5 |
| Hail | Relatively Low | 6th | 1.2 of 5 | 2.2 |
| Strong wind | Relatively Moderate | 2nd | 1.1 of 5 | 1.6 |
Model hail, wind and flood exposure for Charleston 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.