Langley Gulch Power Plant
Natural gas power plant in Payette County, Idaho. 318.5 MW of nameplate capacity across 2 generators, operated by Idaho Power Co.
Also known as EIA plant 57028
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Key facts
- Capacity
- 318.5 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- June 2012First generator online
- Operator
- Idaho Power CoEIA operator ID 9191
- Grid
- IPCOBalancing authority IPCO
- Price nodes
- None linkedNo verified ISO node
- Location
- Payette County, ID43.9044, −116.8197
- EIA plant ID
- 57028EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Langley Gulch produces
Free · EIA-923Net generation, 2025
1.76 TWh
1,755,150 MWh, final
Capacity factor, 2025
62.9%
2024: 65.3%
January to July 2026
909 GWh
Provisional
Range, 2015 to 2025
1.1–1.9
TWh a year. Low 2018, high 2021
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | 425,263 | Not reported | 7 of 12 |
| 2013 | 1,295,859 | Not reported | 12 of 12 |
| 2014 | 1,049,876 | 41.1% | 11 of 12 |
| 2015 | 1,662,770 | 59.6% | 12 of 12 |
| 2016 | 1,420,178 | 50.8% | 12 of 12 |
| 2017 | 1,350,426 | 48.4% | 12 of 12 |
| 2018 | 1,131,203 | 40.5% | 12 of 12 |
| 2019 | 1,501,424 | 53.8% | 12 of 12 |
| 2020 | 1,521,451 | 54.4% | 12 of 12 |
| 2021 | 1,927,107 | 69.1% | 12 of 12 |
| 2022 | 1,548,091 | 55.5% | 12 of 12 |
| 2023 | 1,628,533 | Not reported | 12 of 12 |
| 2024 | 1,826,940 | 65.3% | 12 of 12 |
| 2025 | 1,755,150 | 62.9% | 12 of 12 |
| 2026 (provisional, partial year) | 909,139 | 56.1% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
728,628
US short tons. 2024: 754,965
SO₂, 2025
4
US short tons
NOx, 2025
38
US short tons
CO₂ per MWh, calculated
0.42 t
About 830 lb per MWh
1 of 1 EPA units reported CO₂ in 2025 (CT1), matched to EIA plant 57028 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
365
million gallons
Consumption, 2024
365
million gallons
Source
Snake River Plain Aquifer Wells
Ground, Fresh. Induced-draft tower
Watershed stress
Very low/none · 0.124
USGS SUI, HUC12 Big Willow Creek-Payette River
12 of 12 cooling months report withdrawal. Groundwater user; SUI describes surface water and is context only. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GTG | Natural Gas Fired Combined Cycle | 187.0 | June 2012 |
| STG | Natural Gas Fired Combined Cycle | 131.5 | June 2012 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Idaho Power Co as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Langley Gulch
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Questions about Langley Gulch
How much power does Langley Gulch Power Plant produce?
Langley Gulch Power Plant reported 1,755,150 MWh (1.76 TWh) of net generation in 2025, a 62.9% capacity factor on 318.5 MW of nameplate capacity. From January to July 2026 it reported 909 GWh, which is provisional.
Where is Langley Gulch Power Plant?
Langley Gulch Power Plant is in Payette County, Idaho, at 43.9044, −116.8197. It is in the Idaho Power Company balancing area (IPCO).
Who operates Langley Gulch Power Plant?
EIA-860M for August 2026 lists Idaho Power Co as the operator (EIA operator ID 9191). The operator is not always the owner.
When did Langley Gulch Power Plant start operating?
Its first generator began operating in June 2012, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page