Langley Gulch Power Plant
Natural gas power plant · Payette County, Idaho
Nameplate capacity
319 MW
Rank in Idaho
#3
of 155 plants
In service since
2012
June 2012
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Idaho Power Co
- County
- Payette County
- Generating units
- 2
- Share of state capacity
- 4.84%
- Rank among natural gas plants in Idaho
- #1 of 9
- EIA plant code
- 57028
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GTG | Natural Gas Fired Combined Cycle | 187 MW | 186 MW | 2012 | Operating |
| STG | Natural Gas Fired Combined Cycle | 132 MW | 118 MW | 2012 | 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
| Brownlee | Hydro | 675 MW |
| Dworshak | Hydro | 465 MW |
| Rathdrum Power LLC | Natural gas | 302 MW |
| Evander Andrews Power Complex | Natural gas | 271 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 319 MW solar plant and a 319 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