Home / Power plants / Washington
Power Plants in Washington
All 140 operable plants · EIA inventory, August 2026.
Total capacity
31.8 GW
15th largest of the 50 states and DC
Plants
140
137 in service
Largest plant
6,809 MW
Grand Coulee
Capacity by fuel
68%
13%
| Fuel | Capacity | Share | Plants |
|---|---|---|---|
| Hydro | 21,776 MW | 68.5% | 73 |
| Natural gas | 4,037 MW | 12.7% | 16 |
| Wind | 3,387 MW | 10.7% | 23 |
| Nuclear | 1,200 MW | 3.8% | 1 |
| Coal | 730 MW | 2.3% | 1 |
| Solar | 348 MW | 1.1% | 8 |
| Other | 310 MW | 1.0% | 16 |
| Battery storage | 3.5 MW | 0.0% | 2 |
Nameplate capacity — what the fleet could produce running flat out — not what it actually generated. A plant is filed under the fuel carrying most of its capacity. See what Washington actually generated →
Largest plants in Washington
| # | Plant | Fuel | Capacity | Online |
|---|---|---|---|---|
| 1 | Grand CouleeGrant County | Hydro | 6,809 MW | 1941 |
| 2 | Chief JosephDouglas County | Hydro | 2,456 MW | 1955 |
| 3 | Rocky ReachChelan County | Hydro | 1,349 MW | 1961 |
| 4 | WanapumGrant County | Hydro | 1,220 MW | 2011 |
| 5 | Columbia Generating StationBenton County | Nuclear | 1,200 MW | 1984 |
| 6 | BoundaryPend Oreille County | Hydro | 1,160 MW | 1967 |
| 7 | Priest RapidsGrant County | Hydro | 950 MW | 1959 |
| 8 | WellsChelan County | Hydro | 867 MW | 1967 |
| 9 | Little GooseColumbia County | Hydro | 810 MW | 1970 |
| 10 | Lower GraniteWhitman County | Hydro | 810 MW | 1975 |
Washington's generating fleet in context
Washington holds 31.8 gigawatts of nameplate capacity across 137 plants in service as of August 2026, ranking 15th among the 50 states and DC by fleet size. Hydro dominates the state's generating portfolio at 68.5% of capacity, distributed across 73 plants. Natural gas provides 12.7%, wind 10.7%, nuclear 3.8%, coal 2.3%, and solar 1.1%, with battery storage and other sources making up the remainder. These figures represent what the equipment could produce running at full capacity, not actual generation, which varies significantly by fuel type and season.
The largest plants showcase the depth of the state's hydroelectric resources. Grand Coulee stands foremost at 6,809 megawatts across 33 units, followed by Chief Joseph at 2,456 megawatts with 27 units and Rocky Reach at 1,349 megawatts with 11 units. Wanapum, also hydro, adds 1,220 megawatts from 10 units. Columbia Generating Station, the state's nuclear facility, contributes 1,200 megawatts as a single unit. Together these five plants account for a substantial portion of Washington's generating capacity.
The fleet spans more than a century of installation. Snoqualmie, a hydro plant first online in January 1898, remains in service as the oldest facility. The newest addition is Ostrea Solar, which came online in June 2026. This long history reflects Washington's early development of hydroelectric generation and its more recent expansion into renewable sources like wind and solar.
Written from the EIA figures on this page, covering data through August 2026.
Every plant in Washington, by fuel
Hydro73 plants · 21,776 MW
All US hydro plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Grand Coulee | Grant | 6,809 MW | 33 | 1941 |
| Chief Joseph | Douglas | 2,456 MW | 27 | 1955 |
| Rocky Reach | Chelan | 1,349 MW | 11 | 1961 |
| Wanapum | Grant | 1,220 MW | 10 | 2011 |
| Boundary | Pend Oreille | 1,160 MW | 6 | 1967 |
| Priest Rapids | Grant | 950 MW | 10 | 1959 |
| Wells | Chelan | 867 MW | 10 | 1967 |
| Little Goose | Columbia | 810 MW | 6 | 1970 |
| Lower Granite | Whitman | 810 MW | 6 | 1975 |
| Lower Monumental | Walla Walla | 810 MW | 6 | 1969 |
| Rock Island | Chelan | 629 MW | 19 | 1931 |
| Ice Harbor | Walla Walla | 603 MW | 6 | 1962 |
| Ross | Whatcom | 450 MW | 4 | 1952 |
| Mossyrock | Lewis | 300 MW | 2 | 1968 |
| Swift 1 | Skamania | 240 MW | 3 | 1958 |
| Gorge | Whatcom | 207 MW | 4 | 1924 |
| Diablo | Whatcom | 182 MW | 4 | 1936 |
| Mayfield | Lewis | 162 MW | 4 | 1963 |
| Merwin | Cowlitz | 136 MW | 4 | 1931 |
| Yale | Cowlitz | 134 MW | 2 | 1953 |
| H M Jackson | Snohomish | 112 MW | 4 | 1984 |
| Upper Baker | Whatcom | 105 MW | 2 | 1959 |
| Lower Baker | Skagit | 104 MW | 2 | 1960 |
| Summer Falls Power Plant | Grant | 92 MW | 2 | 1985 |
| Box Canyon | Pend Oreille | 90 MW | 4 | 1955 |
| Cushman 2 | Mason | 85 MW | 5 | 1930 |
| Swift 2 | Cowlitz | 72 MW | 2 | 1958 |
| Cowlitz Falls | Lewis | 70 MW | 2 | 1994 |
| Long Lake | Lincoln | 70 MW | 4 | 1915 |
| LaGrande | Pierce | 64 MW | 5 | 1912 |
| Chelan | Chelan | 59 MW | 2 | 1927 |
| Alder | Pierce | 51 MW | 2 | 1945 |
| Cushman 1 | Mason | 50 MW | 2 | 1926 |
| Little Falls (WA) | Lincoln | 43 MW | 4 | 1910 |
| Snoqualmie 2 | King | 39 MW | 2 | 1957 |
| Nine Mile | Spokane | 38 MW | 4 | 1908 |
| Cedar Falls (WA) | King | 30 MW | 2 | 1921 |
| Packwood | Lewis | 28 MW | 1 | 1964 |
| Main Canal Headworks | Grant | 27 MW | 1 | 1987 |
| Twin Falls Hydro | King | 24 MW | 2 | 1989 |
| Electron | Pierce | 23 MW | 4 | 1904 |
| Upriver Dam Hydro Plant | Spokane | 18 MW | 5 | 1936 |
| South Fork Tolt | King | 17 MW | 1 | 1995 |
| Monroe Street | Spokane | 15 MW | 1 | 1992 |
| Tieton Dam Hydro Electric Project | Yakima | 14 MW | 2 | 2006 |
| Roza | Yakima | 13 MW | 1 | 1958 |
| Snoqualmie | King | 13 MW | 5 | 1898 |
| Wynoochee | Grays Harbor | 13 MW | 1 | 1994 |
| Chandler | Benton | 12 MW | 2 | 1956 |
| Koma Kulshan | Whatcom | 12 MW | 1 | 1990 |
| Yelm | Thurston | 12 MW | 3 | 1930 |
| McNary Dam Fish Attraction Project | Benton | 10 MW | 1 | 1997 |
| Upper Falls | Spokane | 10 MW | 1 | 1922 |
| Youngs Creek Hydroelectric Project | Snohomish | 7.5 MW | 1 | 2011 |
| Russell D Smith | Adams | 6.1 MW | 1 | 1982 |
| Calligan Creek Hydroelectric Project | King | 6.0 MW | 1 | 2018 |
| Hancock Creek Hydroelectric Project | King | 6.0 MW | 1 | 2018 |
| Weeks Falls | King | 4.3 MW | 1 | 1990 |
| Black Creek | King | 3.7 MW | 1 | 1994 |
| Drop 2 (WA) | Yakima | 2.5 MW | 1 | 1942 |
| Newhalem | Whatcom | 2.3 MW | 1 | 1970 |
| Potholes East Canal 66.0 | Franklin | 2.3 MW | 1 | 1985 |
| Eltopia Branch Canal 4.6 | Franklin | 2.2 MW | 1 | 1983 |
| Twin Reservoirs | Walla Walla | 2.2 MW | 1 | 1988 |
| Meyers Falls | Stevens | 1.8 MW | 4 | 1915 |
| Cowiche | Yakima | 1.7 MW | 1 | 1987 |
| Drop 3 (WA) | Yakima | 1.6 MW | 2 | 1932 |
| Orchard Avenue 1 | Yakima | 1.6 MW | 2 | 1987 |
| Rocky Brook Hydroelectric | Jefferson | 1.6 MW | 1 | 1985 |
| Sheep Creek Hydro | Stevens | 1.6 MW | 2 | 1986 |
| Nooksack Hydro | Whatcom | 1.5 MW | 1 | 1906 |
| Lilliwaup Falls Generating | Mason | 1.4 MW | 7 | 1986 |
| Skookumchuck | Thurston | 1.0 MW | 1 | 1990 |
Natural gas16 plants · 4,037 MW
All US natural gas plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Grays Harbor Energy Facility | Grays Harbor | 715 MW | 3 | 2008 |
| Chehalis Generating Facility | Lewis | 593 MW | 3 | 2003 |
| Fredonia (WA) | Skagit | 376 MW | 4 | 1984 |
| Mint Farm Generating Station | Cowlitz | 319 MW | 2 | 2008 |
| Frederickson Power LP | Pierce | 318 MW | 2 | 2002 |
| Goldendale Generating Station | Klickitat | 303 MW | 2 | 2004 |
| Ferndale Generating Station | Whatcom | 286 MW | 3 | 1994 |
| River Road Gen Plant | Clark | 248 MW | 1 | 1997 |
| Frederickson | Pierce | 178 MW | 2 | 1981 |
| Encogen | Whatcom | 176 MW | 4 | 1993 |
| Whitehorn | Whatcom | 169 MW | 2 | 1981 |
| HF Sinclair Puget Sound Refining | Skagit | 140 MW | 3 | 1991 |
| Sumas Power Plant | Whatcom | 126 MW | 2 | 1993 |
| Northeast (WA) | Spokane | 62 MW | 1 | 1978 |
| Boulder Park | Spokane | 25 MW | 6 | 2002 |
| Grimes Way | Whitman | 4.0 MW | 3 | 2005 |
Wind23 plants · 3,387 MW
All US wind plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Lower Snake River Wind Energy Project | Garfield | 343 MW | 1 | 2012 |
| Wild Horse | Kittitas | 273 MW | 3 | 2006 |
| Tucannon River Wind Farm | Columbia | 267 MW | 1 | 2014 |
| Windy Flats Wind Project | Klickitat | 262 MW | 1 | 2009 |
| Marengo Wind Plant | Columbia | 234 MW | 2 | 2007 |
| White Creek Wind Farm | Klickitat | 204 MW | 1 | 2007 |
| Big Horn Wind Project | Klickitat | 199 MW | 1 | 2006 |
| FPL Energy Vansycle LLC (WA) | Walla Walla | 177 MW | 1 | 2001 |
| Hopkins Ridge Wind | Columbia | 157 MW | 2 | 2005 |
| Juniper Canyon I Wind Project | Klickitat | 151 MW | 1 | 2011 |
| Rattlesnake Flat | Adams | 144 MW | 1 | 2020 |
| Washington Wind | Klickitat | 136 MW | 1 | 2009 |
| Skookumchuck Wind Facility | Thurston | 136 MW | 1 | 2020 |
| Palouse | Whitman | 105 MW | 1 | 2012 |
| Goodnoe Hills | Klickitat | 103 MW | 1 | 2008 |
| Sagebrush Power Partners | Kittitas | 101 MW | 1 | 2010 |
| Harvest Wind Project | Klickitat | 99 MW | 1 | 2009 |
| Nine Canyon | Benton | 96 MW | 1 | 2002 |
| Vantage Wind Energy LLC | Kittitas | 90 MW | 1 | 2010 |
| Big Horn Wind II | Klickitat | 50 MW | 1 | 2011 |
| Linden Wind Energy Project | Klickitat | 50 MW | 1 | 2010 |
| Coastal Energy Project | Grays Harbor | 6.0 MW | 1 | 2010 |
| Swauk Wind LLC | Kittitas | 4.3 MW | 1 | 2012 |
Nuclear1 plant · 1,200 MW
All US nuclear plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Columbia Generating Station | Benton | 1,200 MW | 1 | 1984 |
Coal1 plant · 730 MW
All US coal plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Transalta Centralia Generation | Lewis | 730 MW | 1 | 1973 |
Solar8 plants · 348 MW
All US solar plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Lund Hill Solar | Klickitat | 150 MW | 1 | 2022 |
| Goose Prairie Solar | Yakima | 80 MW | 1 | 2024 |
| Ostrea Solar, LLC | Yakima | 80 MW | 1 | 2026 |
| Adams Nielson Solar | Adams | 19 MW | 1 | 2018 |
| Camas Solar Project | Kittitas | 5.0 MW | 1 | 2022 |
| Penstemon Solar Project | Kittitas | 5.0 MW | 1 | 2022 |
| Urtica Solar Project | Kittitas | 5.0 MW | 1 | 2022 |
| Horn Rapids Solar, Storage and Training | Benton | 4.2 MW | 2 | 2020 |
Other16 plants · 310 MW
All US other plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Nippon Dynawave Packaging Longview WA | Cowlitz | 62 MW | 4 | 1948 |
| Kettle Falls Generating Station | Stevens | 58 MW | 2 | 1983 |
| Longview Fibre | Cowlitz | 45 MW | 2 | 1958 |
| Sierra Pacific Burlington Facility | Skagit | 28 MW | 1 | 2007 |
| Spokane Waste to Energy | Spokane | 26 MW | 1 | 1991 |
| Sierra Pacific Aberdeen | Grays Harbor | 18 MW | 1 | 2003 |
| Cosmo Specialty Fibers Plant | Grays Harbor | 15 MW | 2 | 1957 |
| University of Washington Power Plant | King | 15 MW | 7 | 1993 |
| McKinley Paper Co. - Washington Mill | Clallam | 13 MW | 1 | 2022 |
| Port Townsend Paper | Jefferson | 7.5 MW | 1 | 1986 |
| Cedar Hills | King | 5.4 MW | 18 | 2009 |
| West Point Treatment Plant | King | 4.6 MW | 2 | 2012 |
| Darrington | Snohomish | 4.5 MW | 1 | 2007 |
| LRI LFGTE Facility | Pierce | 4.5 MW | 3 | 2013 |
| Crystal Mountain | Pierce | 2.7 MW | 1 | 1969 |
| Biotech LS 0836 | Whitman | 1.0 MW | 1 | 2009 |
Battery storage2 plants · 3.5 MW
All US battery storage plants →| Plant | County | Capacity | Units | Online |
|---|---|---|---|---|
| Glacier Battery Storage | Whatcom | 2.0 MW | 1 | 2016 |
| Arlington Microgrid | Snohomish | 1.5 MW | 2 | 2019 |
Sorted by nameplate capacity within each fuel. “Online” is the year the plant’s earliest surviving unit entered service.
Frequently asked questions
›How many power plants are there in Washington?
Washington has 140 operable power plants with a combined nameplate capacity of 31.8 GW, the 15th largest generating fleet of the 50 states and DC. 137 of them are currently in service.
›What is the largest power plant in Washington?
Grand Coulee in Grant County, a hydro plant with 6,809 MW of capacity across 33 generating units, first online in March 1941.
›What fuel do Washington's power plants use?
Hydro accounts for the largest share of Washington's generating capacity — 21,776 MW, or 68.5% of the total, across 73 plants. Natural gas follows at 12.7%, Wind follows at 10.7%, Nuclear follows at 3.8%. Note this is capacity, not generation — what the fleet could produce, not what it did.
›What is the oldest power plant in Washington?
Snoqualmie is the oldest still operable, with its earliest unit entering service in January 1898. The most recent addition is Ostrea Solar, LLC, online since June 2026.