Hydroelectric Power Plants in Idaho
Every operating hydroelectric power plant in Idaho on EIA-860M for 2026-07: 76 plants, 164 generating units and 3 GW of nameplate capacity across 29 counties.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Plants
- 76
- 164 generating units
- Nameplate capacity
- 3 GW
- Counties
- 29
- Grid operator
- Mixed
- no single ISO covers a majority
Map of hydroelectric power plants in Idaho
Every one of the 76 plants is drawn at the coordinate EIA files for it.
Loading map…
- Hydro · 76
List of hydroelectric power plants in Idaho
Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.
| BrownleeConventional Hydroelectric | Idaho Power Co | Washington | 675 | 5 | 1958 | Operating |
| DworshakConventional Hydroelectric | USACE Northwestern Division | Clearwater | 465 | 3 | 1974 | Operating |
| Cabinet GorgeConventional Hydroelectric | Avista Corp | Bonner | 265.2 | 4 | 1952 | Operating |
| Palisades DamConventional Hydroelectric | U S Bureau of Reclamation | Bonneville | 176.4 | 4 | 1957 | Operating |
| Lucky Peak Power Plant ProjectConventional Hydroelectric | Boise-Kuna Irrigation District | Ada | 101.2 | 3 | 1988 | Operating |
| American FallsConventional Hydroelectric | Idaho Power Co | Power | 92.4 | 3 | 1978 | Standby/Backup |
| C J StrikeConventional Hydroelectric | Idaho Power Co | Owyhee | 82.8 | 3 | 1952 | Operating |
| Bliss (ID)Conventional Hydroelectric | Idaho Power Co | Gooding | 75 | 3 | 1949 | Operating |
| Lower SalmonConventional Hydroelectric | Idaho Power Co | Gooding | 60 | 4 | 1949 | Operating |
| Milner HydroConventional Hydroelectric | Idaho Power Co | Cassia | 59.5 | 3 | 1992 | Operating |
| Twin Falls (ID)Conventional Hydroelectric | Idaho Power Co | Twin Falls | 52.7 | 2 | 1935 | Operating |
| Albeni FallsConventional Hydroelectric | USACE Northwestern Division | Bonner | 42 | 3 | 1955 | Operating |
| Anderson RanchConventional Hydroelectric | U S Bureau of Reclamation | Elmore | 40 | 2 | 1950 | Operating |
| Smith Falls Hydro ProjectConventional Hydroelectric | Smith Creek Hydro, LLC | Boundary | 38.1 | 3 | 1989 | Operating |
| GraceConventional Hydroelectric | PacifiCorp | Caribou | 33 | 3 | 1923 | Operating |
| OneidaConventional Hydroelectric | PacifiCorp | Franklin | 30 | 3 | 1915 | Operating |
| MinidokaConventional Hydroelectric | U S Bureau of Reclamation | Minidoka | 27.7 | 4 | 1927 | Operating |
| Swan FallsConventional Hydroelectric | Idaho Power Co | Ada | 27.2 | 2 | 1994 | Operating |
| Gem StateConventional Hydroelectric | City of Idaho Falls - (ID) | Bonneville | 23.4 | 1 | 1988 | Operating |
| Upper Salmon AConventional Hydroelectric | Idaho Power Co | Twin Falls | 18 | 2 | 1937 | Operating |
| Upper Salmon BConventional Hydroelectric | Idaho Power Co | Twin Falls | 16.5 | 2 | 1947 | Operating |
| Arrowrock Hydroelectric ProjectConventional Hydroelectric | Boise-Kuna Irrigation District | Elmore | 15 | 2 | 2010 | Operating |
| Shoshone FallsConventional Hydroelectric | Idaho Power Co | Jerome | 14.7 | 2 | 1921 | Operating |
| SodaConventional Hydroelectric | PacifiCorp | Caribou | 14.6 | 2 | 1924 | Operating |
| Post FallsConventional Hydroelectric | Avista Corp | Kootenai | 14.5 | 6 | 1906 | Operating |
| Lower MaladConventional Hydroelectric | Idaho Power Co | Gooding | 13.5 | 1 | 1948 | Operating |
| Cascade Dam (ID)Conventional Hydroelectric | Idaho Power Co | Valley | 12.4 | 2 | 1983 | Operating |
| Black CanyonConventional Hydroelectric | U S Bureau of Reclamation | Gem | 10.2 | 2 | 1925 | Operating |
| BypassConventional Hydroelectric | North Side Energy Company | Jerome | 9.9 | 3 | 1987 | Operating |
| Horseshoe Bend Hydroelectric CoConventional Hydroelectric | Horseshoe Bend Hydroelectric Co | Boise | 9.4 | 2 | 1995 | Operating |
| Magic Dam Hydroelectric ProjectConventional Hydroelectric | Wood Hydro, LLC | Blaine | 9 | 3 | 1989 | Operating |
| Falls River HydroConventional Hydroelectric | Marysville Hydro Partners | Fremont | 9 | 2 | 1993 | Operating |
| S E Hazelton AConventional Hydroelectric | North Side Energy Company | Jerome | 8.7 | 3 | 1990 | Operating |
| Wilson Lake Hydroelectric ProjectConventional Hydroelectric | Hazelton/Wilson Joint Venture | Jerome | 8.4 | 2 | 1993 | Operating |
| Upper MaladConventional Hydroelectric | Idaho Power Co | Gooding | 8.3 | 1 | 1948 | Operating |
| City Power PlantConventional Hydroelectric | City of Idaho Falls - (ID) | Bonneville | 8 | 1 | 1982 | Operating |
| Upper Power PlantConventional Hydroelectric | City of Idaho Falls - (ID) | Bonneville | 8 | 1 | 1982 | Operating |
| Lower No 1Conventional Hydroelectric | City of Idaho Falls - (ID) | Bonneville | 8 | 1 | 1982 | Operating |
| South Forks HydroConventional Hydroelectric | South Forks Joint Venture | Twin Falls | 8 | 2 | 1984 | Operating |
| Hazelton B HydroConventional Hydroelectric | Hazelton/Wilson Joint Venture | Jerome | 7.6 | 2 | 1993 | Operating |
| FeltConventional Hydroelectric | Fall River Rural Elec Coop Inc | Teton | 7.4 | 4 | 1946 | Operating |
| Thousand SpringsConventional Hydroelectric | Idaho Power Co | Gooding | 6.8 | 1 | 1920 | Operating |
| AshtonConventional Hydroelectric | PacifiCorp | Fremont | 6.7 | 3 | 1917 | Operating |
| Island ParkConventional Hydroelectric | Fall River Rural Elec Coop Inc | Fremont | 4.8 | 2 | 1994 | Operating |
| Dietrich DropConventional Hydroelectric | Wood Hydro, LLC | Lincoln | 4.8 | 1 | 1990 | Operating |
| Barber DamConventional Hydroelectric | Barber Pool Hydro LLC | Ada | 4.1 | 1 | 1990 | Operating |
| Moyie SpringsConventional Hydroelectric | City of Bonners Ferry (ID) | Boundary | 3.9 | 4 | 1921 | Operating |
| Dry Creek ProjectConventional Hydroelectric | Dry Creek LLC | Butte | 3.6 | 1 | 1987 | Operating |
| Chester Diversion Hydroelectric ProjectConventional Hydroelectric | Fall River Rural Elec Coop Inc | Fremont | 3.6 | 3 | 2014 | Operating |
| Boise R DiversionConventional Hydroelectric | U S Bureau of Reclamation | Ada | 3.3 | 3 | 2004 | Operating |
| Mink Creek HydroConventional Hydroelectric | Mink Creek Hydro Entity | Franklin | 3.1 | 1 | 1986 | Operating |
| Lower No 2Conventional Hydroelectric | City of Idaho Falls - (ID) | Bonneville | 3 | 1 | 1940 | Operating |
| Low Line RapidsConventional Hydroelectric | Lower Lowline LLC | Twin Falls | 2.8 | 1 | 1990 | Operating |
| Little Wood Hydro ProjectConventional Hydroelectric | Littlewood Irrigation District | Blaine | 2.8 | 1 | 1985 | Standby/Backup |
| Birch Creek PowerConventional Hydroelectric | Birch Power Co | Clark | 2.6 | 1 | 1986 | Operating |
| El Dorado Hydro Elk CreekConventional Hydroelectric | Hydroland Omega LLC | Idaho | 2.6 | 1 | 1986 | Operating |
| Clear LakeConventional Hydroelectric | Idaho Power Co | Gooding | 2.5 | 1 | 1937 | Operating |
| Lateral 10 VenturesConventional Hydroelectric | Lateral 10 Ventures | Twin Falls | 2.4 | 1 | 1984 | Operating |
| Crystal SpringsConventional Hydroelectric | Crystal Springs Hydro Elec LP | Twin Falls | 2.3 | 1 | 1988 | Operating |
| MC6 Hydro FacilityConventional Hydroelectric | MC6 Hydro Facility | Ada | 2.3 | 1 | 2021 | Operating |
| Rock Creek IConventional Hydroelectric | Shorock Hydro Inc | Twin Falls | 2.1 | 1 | 1983 | Operating |
| Rock Creek IIConventional Hydroelectric | Hydroland Omega LLC | Twin Falls | 1.9 | 1 | 1990 | Operating |
| Last ChanceConventional Hydroelectric | PacifiCorp | Caribou | 1.7 | 3 | 1984 | Operating |
| Mora Drop Hydroelectric ProjectConventional Hydroelectric | Boise Project Board of Control | Ada | 1.7 | 1 | 2006 | Operating |
| Marsh Valley DevelopmentConventional Hydroelectric | Marsh Valley Development Inc | Bannock | 1.6 | 1 | 1993 | Operating |
| Little Mac ProjectConventional Hydroelectric | Little Mac Power Company | Twin Falls | 1.5 | 4 | 1984 | Operating |
| Mile 28 Water Power ProjectConventional Hydroelectric | Wood Hydro, LLC | Jerome | 1.4 | 2 | 1994 | Operating |
| Koyle Ranch Hydroelectric ProjectConventional Hydroelectric | Koyle Hydro Inc | Gooding | 1.3 | 3 | 1983 | Operating |
| Blind Canyon HydroConventional Hydroelectric | Blind Canyon Aquaranch, Inc. | Gooding | 1.3 | 1 | 1992 | Operating |
| North Gooding Main HydroConventional Hydroelectric | North Gooding Main Hydro LLC | Gooding | 1.3 | 1 | 2016 | Operating |
| Marco RanchConventional Hydroelectric | Marco Power Inc | Jerome | 1.2 | 4 | 1985 | Operating |
| Ford Hydro LPConventional Hydroelectric | Ford Hydro Ltd Partnership | Clearwater | 1.2 | 3 | 1988 | Operating |
| Head of U Canal Hydro ProjectConventional Hydroelectric | North Side Energy Company | Jerome | 1.2 | 1 | 2015 | Operating |
| AJMS, LLCConventional Hydroelectric | AJMS, LLC | Lincoln | 1.2 | 1 | 2015 | Operating |
| Fargo DropConventional Hydroelectric | Boise Project Board of Control | Canyon | 1.1 | 1 | 2013 | Operating |
| GeoBon IIConventional Hydroelectric | Koosh, Inc. | Lincoln | 1 | 1 | 1986 | Operating |
Largest hydroelectric power plants in Idaho
- 1BrownleeWashington County, Idaho675 MW
- 2DworshakClearwater County, Idaho465 MW
- 3Cabinet GorgeBonner County, Idaho265.2 MW
- 4Palisades DamBonneville County, Idaho176.4 MW
- 5Lucky Peak Power Plant ProjectAda County, Idaho101.2 MW
- 6American FallsPower County, Idaho92.4 MW
- 7C J StrikeOwyhee County, Idaho82.8 MW
- 8Bliss (ID)Gooding County, Idaho75 MW
- 9Lower SalmonGooding County, Idaho60 MW
- 10Milner HydroCassia County, Idaho59.5 MW
Hydroelectric power plants by county in Idaho
The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.
| County | Plants | Nameplate MW |
|---|---|---|
| Washington | 1 | 675 |
| Clearwater | 2 | 466.2 |
| Bonner | 2 | 307.2 |
| Bonneville | 6 | 226.8 |
| Gooding | 9 | 170 |
| Ada | 6 | 139.8 |
| Twin Falls | 10 | 108.2 |
| Power | 1 | 92.4 |
| Owyhee | 1 | 82.8 |
| Cassia | 1 | 59.5 |
| Elmore | 2 | 55 |
| Jerome | 8 | 53.1 |
| Caribou | 3 | 49.3 |
| Boundary | 2 | 42 |
| Franklin | 2 | 33.1 |
| Minidoka | 1 | 27.7 |
| Fremont | 4 | 24.1 |
| Kootenai | 1 | 14.5 |
| Valley | 1 | 12.4 |
| Blaine | 2 | 11.8 |
| Gem | 1 | 10.2 |
| Boise | 1 | 9.4 |
| Teton | 1 | 7.4 |
| Lincoln | 3 | 7 |
| Butte | 1 | 3.6 |
| Clark | 1 | 2.6 |
| Idaho | 1 | 2.6 |
| Bannock | 1 | 1.6 |
| Canyon | 1 | 1.1 |
Hydroelectric Power Plants in Idaho: FAQ
- How many hydroelectric power plants are in Idaho?
- 76, with 3 GW of nameplate capacity between them, spread over 29 counties. That is the EIA-860M operating count for 2026-07.
- Is there a map of Idaho hydroelectric power plants?
- Yes — the map above. Each dot is one hydroelectric power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
- Which is the largest hydroelectric power plant in Idaho?
- Brownlee, at 675 MW. The table is sorted largest first, so the rest follow it.
- Is there a hydroelectric power plant near me in Idaho?
- The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
- Which grid operator runs Idaho's hydroelectric power plants?
- No single ISO or RTO covers most of them. EIA files each plant against its own balancing authority, which in Idaho is largely a vertically integrated utility rather than an organised market.
- How current is this, and what is left out?
- EIA-860M for 2026-07. Conventional hydroelectric. Pumped storage is counted separately. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.