Power plants in Idaho

Idaho has 153 power plants of 1 MW or more in the 2025 EIA-860 data, with 6,431 MW of nameplate capacity, the 43rd-largest total among the 50 states and DC. Hydroelectric accounts for 42% of that capacity. The biggest single site is Brownlee at 675 MW. Units that came online from 2020 to 2025 add 1,108 MW, led by solar at 42%. Units retired since 2016 at plants still operating total 21 MW, most of it geothermal.

Hydroelectric2,696 MW42%
Natural gas1,257 MW20%
Wind1,132 MW18%
Solar702 MW11%
Battery storage459 MW7.1%
Biomass and waste148 MW2.3%
Geothermal16 MW0.2%
Other sources15.9 MW0.2%
Oil and petroleum5 MW0.1%

What is running, by the decade it came online

Natural gasOil and petroleumHydroelectricWindSolarBattery storageGeothermalBiomass and wasteOther sources

Columns above the line show capacity still operating in 2025, stacked by fuel. Below the line: capacity retired in each decade at plants that still operate.

The 25 largest plants

Rank	Plant	Runs on	Capacity	First unit	Operator
1	Brownlee	Hydroelectric	675 MW	1958	Idaho Power Co
2	Dworshak	Hydroelectric	465 MW	1974	USACE Northwestern Division
3	Langley Gulch Power Plant	Natural gas	318 MW	2012	Idaho Power Co
4	Rathdrum Power LLC	Natural gas	302 MW	2001	Rathdrum Power LLC
5	Evander Andrews Power Complex	Natural gas	271 MW	2001	Idaho Power Co
6	Cabinet Gorge	Hydroelectric	265 MW	1952	Avista Corp
7	Matrix Pleasant Valley	Solar	200 MW	2025	Pleasant Valley Solar, LLC
8	Palisades Dam	Hydroelectric	176 MW	1957	U S Bureau of Reclamation
9	Bennett Mountain	Natural gas	173 MW	2005	Idaho Power Co
10	Rathdrum	Natural gas	166 MW	1994	Avista Corp
11	Cedar Creek Wind, LLC	Wind	160 MW	2024	Cedar Creek Wind, LLC
12	Kuna BESS	Battery storage	150 MW	2025	Kuna BESS, LLC
13	Goshen Phase II	Wind	124 MW	2010	Clearlight Energy Holdings LP
14	Jackpot Solar, LLC	Solar	120 MW	2022	Deriva Energy
15	Meadow Creek Project Company	Wind	120 MW	2012	Ridgeline Energy LLC
16	Hemmingway BESS	Battery storage	116 MW	2025	Idaho Power Co
17	Clearwater Paper IPP Lewiston	Biomass and waste	114 MW	1950	Clearwater Paper Corporation
18	Lucky Peak Power Plant Project	Hydroelectric	101 MW	1988	Boise-Kuna Irrigation District
19	Franklin Solar Hybrid	Solar	100 MW	2024	Franklin Solar Idaho
20	American Falls	Hydroelectric	92.4 MW	1978	Idaho Power Co
21	C J Strike	Hydroelectric	82.8 MW	1952	Idaho Power Co
22	Happy Valley Battery Storage	Battery storage	82 MW	2025	Idaho Power Co
23	Grand View Solar Two	Solar	80 MW	2016	Grand View PV Solar Two, LLC
24	Rockland Wind Farm	Wind	79.2 MW	2011	Ridgeline Energy LLC
25	Bliss (ID)	Hydroelectric	75 MW	1949	Idaho Power Co

All 153 plants in the finder

Largest plant for each main fuel

Main fuel	Plants	Capacity	Largest plant	Its capacity
Hydroelectric	76	2,696 MW	Brownlee	675 MW
Natural gas	8	1,257 MW	Langley Gulch Power Plant	318 MW
Wind	33	1,132 MW	Cedar Creek Wind, LLC	160 MW
Solar	13	702 MW	Matrix Pleasant Valley	200 MW
Battery storage	9	459 MW	Kuna BESS	150 MW
Biomass and waste	11	148 MW	Clearwater Paper IPP Lewiston	114 MW
Geothermal	1	16 MW	Raft River Geothermal Power Plant	16 MW
Other sources	1	15.9 MW	Simplot Leasing Don Plant	15.9 MW
Oil and petroleum	1	5 MW	Salmon Diesel	5 MW

Balancing areas

Area	Plants	Capacity
Idaho Power	109	3,989 MW
Bonneville Power Administration	13	894 MW
Avista	8	872 MW
PacifiCorp East	23	676 MW

Biggest operators here

Operator	Plants	Capacity
Idaho Power Co	28	2,294 MW
USACE Northwestern Division	2	507 MW
Avista Corp	3	446 MW
Rathdrum Power LLC	1	302 MW
U S Bureau of Reclamation	5	258 MW
Pleasant Valley Solar, LLC	1	200 MW
Ridgeline Energy LLC	2	199 MW
Idaho Wind Partners 1 LLC	11	185 MW
Cedar Creek Wind, LLC	1	160 MW
Kuna BESS, LLC	1	150 MW