99 Islands
Hydro power plant · Cherokee County, South Carolina
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Duke Energy Carolinas, LLC
- County
- Cherokee County
- Generating units
- 4
- Share of state capacity
- 0.04%
- Rank among hydro plants in South Carolina
- #16 of 32
- EIA plant code
- 3272
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 3.0 MW | 4.2 MW | 2010 | Operating |
| 2 | Conventional Hydroelectric | 3.0 MW | 3.4 MW | 2010 | Operating |
| 3 | Conventional Hydroelectric | 3.0 MW | 4.2 MW | 2010 | Operating |
| 4 | Conventional Hydroelectric | 3.0 MW | 3.4 MW | 2010 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in South Carolina
| Duke Energy CHP at Clemson University | Natural gas | 13 MW |
| Midway Green Solar | Solar | 13 MW |
| Great Falls (SC) | Hydro | 12 MW |
| Trask East Solar | Solar | 12 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 12 MW solar plant and a 12 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All South Carolina power plants · What South Carolina actually generates