Hydroelectric power plants in Idaho

74 operating hydroelectric power plants in Idaho with 2,596 MW of hydroelectric capacity, largest first. From EIA-860M, August 2026.

Plants

Hydroelectric capacity

2,596 MW

Net generation, 2025

8.63 TWh

72 of 74 plants reported

Largest

Brownlee

675 MW

Largest hydroelectric power plants in Idaho

#	Plant	Hydroelectric MW	2025 net generation, GWhGWh, 2025	Capacity factor	Operator
1	BrownleeWashington County	675	2,256	38.1%	Idaho Power Co
2	DworshakClearwater County	465	1,517	37.2%	USACE Northwestern Division
3	Cabinet GorgeBonner County	265	886	38.2%	Avista Corp
4	Palisades DamBonneville County	176	657	42.5%	U S Bureau of Reclamation
5	Lucky Peak Power Plant ProjectAda County	101	311	35.1%	Boise-Kuna Irrigation District
6	C J StrikeOwyhee County	83	364	50.2%	Idaho Power Co
7	Bliss (ID)Gooding County	75	298	45.3%	Idaho Power Co
8	Lower SalmonGooding County	60	197	37.4%	Idaho Power Co
9	Milner HydroCassia County	60	33.7	6.5%	Idaho Power Co
10	Twin Falls (ID)Twin Falls County	53	43.5	9.4%	Idaho Power Co
11	Albeni FallsBonner County	42	177	48.1%	USACE Northwestern Division
12	Anderson RanchElmore County	40	85.8	24.5%	U S Bureau of Reclamation
13	Smith Falls Hydro ProjectBoundary County	38	87.2	26.1%	Smith Creek Hydro, LLC
14	GraceCaribou County	33	82.7	28.6%	PacifiCorp
15	OneidaFranklin County	30	39.4	15.0%	PacifiCorp
16	MinidokaMinidoka County	28	98.8	40.7%	U S Bureau of Reclamation
17	Swan FallsAda County	27	110	46.2%	Idaho Power Co
18	Gem StateBonneville County	23	117	57.2%	City of Idaho Falls - (ID)
19	Upper Salmon ATwin Falls County	18	92.6	58.8%	Idaho Power Co
20	Upper Salmon BTwin Falls County	17	89.1	61.7%	Idaho Power Co
21	Arrowrock Hydroelectric ProjectElmore County	15	63.2	48.1%	Boise-Kuna Irrigation District
22	Shoshone FallsJerome County	15	51.9	40.3%	Idaho Power Co
23	SodaCaribou County	15	16.3	12.7%	PacifiCorp
24	Lower MaladGooding County	14	104	88.3%	Idaho Power Co
25	Cascade Dam (ID)Valley County	12	40.3	37.1%	Idaho Power Co
26	Black CanyonGem County	10	62.9	70.4%	U S Bureau of Reclamation
27	BypassJerome County	9.9	28.2	32.6%	North Side Energy Company
28	Horseshoe Bend Hydroelectric CoBoise County	9.4	46.8	56.8%	Horseshoe Bend Hydroelectric Co
29	Magic Dam Hydroelectric ProjectBlaine County	9.0	9.8	12.5%	Wood Hydro, LLC
30	Falls River HydroFremont County	9.0	43.2	54.8%	Marysville Hydro Partners
31	Post FallsKootenai County	8.8	60.4	47.6%	Avista Corp
32	S E Hazelton AJerome County	8.7	24.9	32.6%	North Side Energy Company
33	Wilson Lake Hydroelectric ProjectJerome County	8.4	27.3	37.1%	Hazelton/Wilson Joint Venture
34	Upper MaladGooding County	8.3	55.3	76.1%	Idaho Power Co
35	City Power PlantBonneville County	8.0	39.6	56.5%	City of Idaho Falls - (ID)
36	Upper Power PlantBonneville County	8.0	44.8	63.9%	City of Idaho Falls - (ID)
37	Lower No 1Bonneville County	8.0	41.6	59.4%	City of Idaho Falls - (ID)
38	South Forks HydroTwin Falls County	8.0	26.3	37.6%	South Forks Joint Venture
39	Hazelton B HydroJerome County	7.6	23.3	35.1%	Hazelton/Wilson Joint Venture
40	FeltTeton County	7.4	24.2	37.4%	Fall River Rural Elec Coop Inc
41	Thousand SpringsGooding County	6.8	51.8	87.0%	Idaho Power Co
42	AshtonFremont County	6.7	28.0	47.7%	PacifiCorp
43	Island ParkFremont County	4.8	9.7	23.0%	Fall River Rural Elec Coop Inc
44	Dietrich DropLincoln County	4.8	11.9	28.3%	Wood Hydro, LLC
45	Barber DamAda County	4.1	6.7	18.6%	Barber Pool Hydro LLC
46	Moyie SpringsBoundary County	3.9	21.4	62.6%	City of Bonners Ferry (ID)
47	Dry Creek ProjectButte County	3.6	7.8	24.6%	Dry Creek LLC
48	Chester Diversion Hydroelectric ProjectFremont County	3.6	7.8	24.7%	Fall River Rural Elec Coop Inc
49	Boise R DiversionAda County	3.3	0.1	0.3%	U S Bureau of Reclamation
50	Mink Creek HydroFranklin County	3.1	8.7	31.9%	Mink Creek Hydro Entity
51	Lower No 2Bonneville County	3.0	3.8	14.3%	City of Idaho Falls - (ID)
52	Low Line RapidsTwin Falls County	2.8	8.3	33.9%	Lower Lowline LLC
53	Birch Creek PowerClark County	2.6	10.4	45.5%	Birch Power Co
54	El Dorado Hydro Elk CreekIdaho County	2.6	–	–	Hydroland Omega LLC
55	Clear LakeGooding County	2.5	11.8	53.9%	Idaho Power Co
56	Lateral 10 VenturesTwin Falls County	2.4	0.6	2.7%	Lateral 10 Ventures
57	Crystal SpringsTwin Falls County	2.3	8.5	42.1%	Crystal Springs Hydro Elec LP
58	MC6 Hydro FacilityAda County	2.3	8.4	41.5%	MC6 Hydro Facility
59	Rock Creek ITwin Falls County	2.1	0.1	0.5%	Shorock Hydro Inc
60	Rock Creek IITwin Falls County	1.9	–	–	Hydroland Omega LLC
61	Last ChanceCaribou County	1.7	3.5	23.4%	PacifiCorp
62	Mora Drop Hydroelectric ProjectAda County	1.7	4.6	30.9%	Boise Project Board of Control
63	Marsh Valley DevelopmentBannock County	1.6	3.5	25.0%	Marsh Valley Development Inc
64	Little Mac ProjectTwin Falls County	1.5	4.3	32.5%	Little Mac Power Company
65	Mile 28 Water Power ProjectJerome County	1.4	5.0	40.7%	Wood Hydro, LLC
66	Koyle Ranch Hydroelectric ProjectGooding County	1.3	3.4	29.5%	Koyle Hydro Inc
67	Blind Canyon HydroGooding County	1.3	3.7	32.2%	Blind Canyon Aquaranch, Inc.
68	North Gooding Main HydroGooding County	1.3	4.6	40.1%	North Gooding Main Hydro LLC
69	Ford Hydro LPClearwater County	1.2	3.1	29.1%	Ford Hydro Ltd Partnership
70	Marco RanchJerome County	1.2	2.5	23.5%	Marco Power Inc
71	Head of U Canal Hydro ProjectJerome County	1.2	4.6	43.8%	North Side Energy Company
72	AJMS, LLCLincoln County	1.2	3.4	32.1%	AJMS, LLC
73	Fargo DropCanyon County	1.1	3.8	39.0%	Boise Project Board of Control
74	GeoBon IILincoln County	1.0	0.1	0.6%	Koosh, Inc.

Projects where hydroelectric is the largest fuel or at least a fifth of nameplate capacity. MW is hydroelectric nameplate only; net generation covers the whole project. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources

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