Power plants in the Idaho Power balancing area
The Idaho Power balancing area takes in 134 power plants with 4,872 MW of nameplate capacity, the 29th-largest of the 40 areas covered here. Its plants sit in two states, with Idaho holding 82% of the capacity. Hydroelectric makes up 42% of the mix, and the largest plant is Brownlee (675 MW). Since 2020, 961 MW has come online here, 51% of it solar.
- Hydroelectric2,057 MW42%
- Natural gas783 MW16%
- Solar781 MW16%
- Wind715 MW15%
- Battery storage459 MW9.4%
- Geothermal33 MW0.7%
- Biomass and waste23.5 MW0.5%
- Other sources15.9 MW0.3%
- Oil and petroleum5 MW0.1%
Capacity by decade it came online
Natural gasOil and petroleumHydroelectricWindSolarBattery storageGeothermalBiomass and wasteOther sources
Above the line: capacity operating in 2025. Below: capacity retired at plants that still run.
The 25 largest plants in the area
| Rank | Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|---|
| 1 | Brownlee | Idaho | Hydroelectric | 675 MW | 1958 |
| 2 | Hells Canyon | Oregon | Hydroelectric | 411 MW | 1967 |
| 3 | Langley Gulch Power Plant | Idaho | Natural gas | 318 MW | 2012 |
| 4 | Evander Andrews Power Complex | Idaho | Natural gas | 271 MW | 2001 |
| 5 | Matrix Pleasant Valley | Idaho | Solar | 200 MW | 2025 |
| 6 | Oxbow (OR) | Oregon | Hydroelectric | 190 MW | 1961 |
| 7 | Bennett Mountain | Idaho | Natural gas | 173 MW | 2005 |
| 8 | Kuna BESS | Idaho | Battery storage | 150 MW | 2025 |
| 9 | Jackpot Solar, LLC | Idaho | Solar | 120 MW | 2022 |
| 10 | Hemmingway BESS | Idaho | Battery storage | 116 MW | 2025 |
| 11 | Lucky Peak Power Plant Project | Idaho | Hydroelectric | 101 MW | 1988 |
| 12 | Elkhorn Valley Wind Farm | Oregon | Wind | 101 MW | 2007 |
| 13 | Franklin Solar Hybrid | Idaho | Solar | 100 MW | 2024 |
| 14 | American Falls | Idaho | Hydroelectric | 92.4 MW | 1978 |
| 15 | C J Strike | Idaho | Hydroelectric | 82.8 MW | 1952 |
| 16 | Happy Valley Battery Storage | Idaho | Battery storage | 82 MW | 2025 |
| 17 | Grand View Solar Two | Idaho | Solar | 80 MW | 2016 |
| 18 | Rockland Wind Farm | Idaho | Wind | 79.2 MW | 2011 |
| 19 | Bliss (ID) | Idaho | Hydroelectric | 75 MW | 1949 |
| 20 | Franklin Battery Storage | Idaho | Battery storage | 60 MW | 2025 |
| 21 | Lower Salmon | Idaho | Hydroelectric | 60 MW | 1949 |
| 22 | Milner Hydro | Idaho | Hydroelectric | 59.5 MW | 1992 |
| 23 | Twin Falls (ID) | Idaho | Hydroelectric | 52.7 MW | 1935 |
| 24 | Black Mesa BESS | Idaho | Battery storage | 40 MW | 2024 |
| 25 | Black Mesa Solar, LLC | Idaho | Solar | 40 MW | 2023 |
Operators with the most capacity
| Operator | Plants | Capacity |
|---|---|---|
| Idaho Power Co | 30 | 2,895 MW |
| Pleasant Valley Solar, LLC | 1 | 200 MW |
| Idaho Wind Partners 1 LLC | 11 | 185 MW |
| Kuna BESS, LLC | 1 | 150 MW |
| Mountain Air Projects, LLC | 6 | 138 MW |
| Deriva Energy | 1 | 120 MW |
| Boise-Kuna Irrigation District | 2 | 116 MW |
| Telocaset Wind Power Partners | 1 | 101 MW |
| Franklin Solar Idaho | 1 | 100 MW |
| Grand View PV Solar Two, LLC | 1 | 80 MW |