Langley Gulch Power Plant
Payette County, Idaho · EIA plant ID 57028 · Operator: Idaho Power Co
Nameplate319MWSummer 303 MW
Generators2in service
Net generation1,721GWh12 mo to Aug 2026
Capacity factor65%gas/coal/oil units, summer MW
Heat rate7,468Btu/kWhfossil units, electric fuel, HHV
First online2012Runs as baseload
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2012 | 425.3 | 27.7% | 6,877 |
| 2013 | 1,295.9 | 49.5% | 7,077 |
| 2014 | 1,049.9 | 40.0% | 6,943 |
| 2015 | 1,662.8 | 63.3% | 6,950 |
| 2016 | 1,420.2 | 53.9% | 7,078 |
| 2017 | 1,350.4 | 51.4% | 7,009 |
| 2018 | 1,131.2 | 43.1% | 6,993 |
| 2019 | 1,501.4 | 57.2% | 7,040 |
| 2020 | 1,521.5 | 57.8% | 7,032 |
| 2021 | 1,927.1 | 73.0% | 7,071 |
| 2022 | 1,548.1 | 50.9% | 6,915 |
| 2023 | 1,628.5 | 52.7% | 6,988 |
| 2024 | 1,826.9 | 68.1% | 7,002 |
| 2025 | 1,755.2 | 66.1% | 7,469 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GTG | Natural Gas Fired Combined Cycle | CT | 187 | 185.7 | Jun 2012 | Operating | — | coming soon |
| STG | Natural Gas Fired Combined Cycle | CA | 131.5 | 117.7 | Jun 2012 | Operating | — | coming soon |
Owner / operator
Operator: Idaho Power Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Idaho Power Co | 100.0% | 319 MW |
Nearby plants
Within 80 km.
| Thunderegg Solar Center, LLC | 10 MW | 13.8 km |
| Verde Light Community Solar | 3 MW | 20.8 km |
| Morgan Solar Center | 3 MW | 21.1 km |
| Open Range Solar Center, LLC | 10 MW | 23 km |
| Railroad Solar Center, LLC | 5 MW | 24.8 km |
| Fry Ontario Solar Project | — | 27.1 km |