Rock Creek II
Hydro power plant · Twin Falls County, Idaho
Nameplate capacity
1.9 MW
Rank in Idaho
#138
of 155 plants
In service since
1990
August 1990
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Hydroland Omega LLC
- County
- Twin Falls County
- Generating units
- 1
- Share of state capacity
- 0.03%
- Rank among hydro plants in Idaho
- #62 of 76
- EIA plant code
- 10809
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | 1.9 MW | 1.8 MW | 1990 | 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 Idaho
| Filer BESS | Battery storage | 2.0 MW |
| Melba BESS | Battery storage | 2.0 MW |
| Kettle Butte Digester, LLC | Other | 1.8 MW |
| Last Chance | Hydro | 1.7 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 1.9 MW solar plant and a 1.9 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 Idaho power plants · What Idaho actually generates