Directory of Power Plants in Washington
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Nooksack Hydro | Puget Sound Hydro LLC | Glacier, WA | Puget Sound Energy, Inc. (PSEI) | 20.2 GWh | Oct 1906 | Dec 2025 | Water |
| Hancock Creek Hydroelectric Project | PUD No 1 of Snohomish County - (WA) | Snoqualmie, WA | Puget Sound Energy, Inc. (PSEI) | 18.3 GWh | Jan 2018 | Dec 2025 | Water |
| PEC Headworks | Columbia Basin Hydropower | Moses Lake, WA | Public Utility District No. 2 of Grant County, Washington (GCPD) | 17.7 GWh | Aug 1990 | Oct 2025 | Water |
| Russell D Smith | Columbia Basin Hydropower | Othello, WA | Bonneville Power Administration (BPAT) | 14.4 GWh | Aug 1982 | Oct 2025 | Water |
| West Point Treatment Plant | King County Dept-Natural Res - (WA) | Seattle, WA | Seattle City Light (SCL) | 14.3 GWh | May 2012 | Dec 2025 | Other Biomass Gas |
| Youngs Creek Hydroelectric Project | PUD No 1 of Snohomish County - (WA) | Monroe, WA | Bonneville Power Administration (BPAT) | 12.9 GWh | Oct 2011 | Dec 2025 | Water |
| Calligan Creek Hydroelectric Project | PUD No 1 of Snohomish County - (WA) | Snoqualmie, WA | Puget Sound Energy, Inc. (PSEI) | 12.6 GWh | Jan 2018 | Dec 2025 | Water |
| Darrington | Hampton Lumber Mills - Washington Inc | Darrington, WA | Bonneville Power Administration (BPAT) | 12.3 GWh | Jan 2007 | Dec 2025 | Wood/Wood Waste Solids |
| Urtica Solar Project | Altus Power America Management, LLC | Ellensburg, WA | Puget Sound Energy, Inc. (PSEI) | 11.4 GWh | Oct 2022 | Dec 2025 | Solar |
| Penstemon Solar Project | Altus Power America Management, LLC | Ellensburg, WA | Puget Sound Energy, Inc. (PSEI) | 11.2 GWh | Dec 2021 | Dec 2025 | Solar |
| Camas Solar Project | Altus Power America Management, LLC | Ellensburg, WA | Puget Sound Energy, Inc. (PSEI) | 10.7 GWh | May 2022 | Dec 2025 | Solar |
| Weeks Falls | Eagle Creek Renewable Energy, LLC | North Bend, WA | Puget Sound Energy, Inc. (PSEI) | 10.7 GWh | May 1990 | Dec 2025 | Water |
| Meyers Falls | Hydro Technology Systems Inc | Kettle Falls, WA | Avista Corporation (AVA) | 8.7 GWh | May 1915 | Dec 2025 | Water |
| Black Creek | Black Creek Hydro Inc | Snoqualmie, WA | Puget Sound Energy, Inc. (PSEI) | 8.7 GWh | Jan 1994 | Dec 2025 | Water |
| Port Townsend Paper | Port Townsend Paper Co | Port Townsend, WA | Bonneville Power Administration (BPAT) | 7.7 GWh | Dec 1928 | Dec 2025 | Black Liquor : 48.8% Wood/Wood Waste Solids : 40.5% Natural Gas : 9.0% Waste/Other Oil : 1.6% |
| Eltopia Branch Canal 4.6 | Columbia Basin Hydropower | Pasco, WA | Bonneville Power Administration (BPAT) | 7.7 GWh | Apr 1983 | Oct 2025 | Water |
| Twin Reservoirs | City of Walla Walla - (WA) | Walla Walla, WA | Bonneville Power Administration (BPAT) | 6.9 GWh | Mar 1988 | Dec 2025 | Water |
| Sheep Creek Hydro | Sheep Creek Hydro Inc | Northport, WA | Avista Corporation (AVA) | 6.8 GWh | May 1986 | Dec 2025 | Water |
| Lilliwaup Falls Generating | William G. Reed Jr | Lilliwaup, WA | Bonneville Power Administration (BPAT) | 5.3 GWh | Apr 1986 | Dec 2025 | Water |
| Horn Rapids Solar, Storage and Training | Energy Northwest | Richland, WA | Bonneville Power Administration (BPAT) | 4.6 GWh | Sep 2020 | Dec 2025 | Solar |
| Cowiche | Yakima-Tieton Irrigation Dist | Tieton, WA | PacifiCorp West (PACW) | 3.4 GWh | Feb 1987 | Oct 2025 | Water |
| Potholes East Canal 66.0 | Columbia Basin Hydropower | Pasco, WA | Bonneville Power Administration (BPAT) | 3.2 GWh | Feb 1985 | Oct 2025 | Water |
| Orchard Avenue 1 | Yakima-Tieton Irrigation Dist | Yakima, WA | PacifiCorp West (PACW) | 2.9 GWh | Feb 1987 | Oct 2025 | Water |
| Swauk Wind LLC | Gamesa Wind US LLC | Thorp, WA | Puget Sound Energy, Inc. (PSEI) | 2.9 GWh | Nov 2012 | Dec 2025 | Wind |
| Skookumchuck | TransAlta Centralia Gen LLC | Tenino, WA | Bonneville Power Administration (BPAT) | 1.8 GWh | Aug 1990 | Apr 2025 | Water |
| Crystal Mountain | Puget Sound Energy Inc | Greenwater, WA | Puget Sound Energy, Inc. (PSEI) | 775.0 MWh | Nov 1969 | May 2026 | Distillate Fuel Oil |
| Arlington Microgrid | PUD No 1 of Snohomish County - (WA) | Arlington, WA | Bonneville Power Administration (BPAT) | 601.0 MWh | May 2019 | Dec 2025 | Solar |
| Northeast (WA) | Avista Corp | Spokane, WA | Avista Corporation (AVA) | 526.0 MWh | Nov 1978 | Dec 2025 | Natural Gas |
| Rocky Brook Hydroelectric | Rocky Brook Electric Inc | Brinnon, WA | Bonneville Power Administration (BPAT) | 464.0 MWh | Nov 1985 | May 2025 | Water |
| Grimes Way | Washington State University | Pullman, WA | Avista Corporation (AVA) | 138.0 MWh | Dec 2004 | Jun 2026 | Natural Gas : 57.1% Distillate Fuel Oil : 42.9% |
| University of Washington Power Plant | University of Washington | Seattle, WA | Seattle City Light (SCL) | 127.4 MWh | Dec 1968 | Jun 2026 | Distillate Fuel Oil |
| Cedar Hills | King County Solid Waste Division | Maple Valley, WA | Puget Sound Energy, Inc. (PSEI) | 53.0 MWh | Mar 2009 | Dec 2025 | Landfill Gas : 86.4% Distillate Fuel Oil : 13.6% |
Browse Power Plants By Washington Counties
Figures are based on June 2026 generation numbers.| County | State Rank | Active Plants | Jun 2026 Generation |
|---|---|---|---|
| Grant County, WA | # 1 | 9 | 29.8 TWh |
| Chelan County, WA | # 2 | 6 | 13.6 TWh |
| Douglas County, WA | # 3 | 1 | 11.7 TWh |
| Benton County, WA | # 4 | 7 | 10.1 TWh |
| Lewis County, WA | # 5 | 8 | 7.3 TWh |
| Klickitat County, WA | # 6 | 17 | 5.4 TWh |
| Pend Oreille County, WA | # 7 | 3 | 4.4 TWh |
| Whatcom County, WA | # 8 | 13 | 4.1 TWh |
| Cowlitz County, WA | # 9 | 6 | 3.7 TWh |
| Columbia County, WA | # 10 | 4 | 3.3 TWh |
| Walla Walla County, WA | # 11 | 4 | 3.2 TWh |
| Grays Harbor County, WA | # 12 | 6 | 2.1 TWh |
| Pierce County, WA | # 13 | 14 | 2.1 TWh |
| Whitman County, WA | # 14 | 6 | 1.8 TWh |
| Skagit County, WA | # 15 | 4 | 1.5 TWh |
| County | State Rank | Active Plants | Jun 2026 Generation |
|---|---|---|---|
| Kittitas County, WA | # 16 | 9 | 1.2 TWh |
| Clark County, WA | # 17 | 2 | 812.4 GWh |
| Garfield County, WA | # 18 | 2 | 811.6 GWh |
| Lincoln County, WA | # 19 | 2 | 624.1 GWh |
| Spokane County, WA | # 20 | 7 | 560.0 GWh |
| Skamania County, WA | # 21 | 1 | 503.6 GWh |
| Adams County, WA | # 22 | 4 | 456.9 GWh |
| Thurston County, WA | # 23 | 4 | 454.8 GWh |
| King County, WA | # 24 | 12 | 392.2 GWh |
| Snohomish County, WA | # 25 | 9 | 359.3 GWh |
| Stevens County, WA | # 26 | 4 | 302.8 GWh |
| Mason County, WA | # 27 | 3 | 273.6 GWh |
| Yakima County, WA | # 28 | 12 | 269.1 GWh |
| Franklin County, WA | # 29 | 3 | 10.9 GWh |
| Jefferson County, WA | # 30 | 3 | 8.2 GWh |