Directory of Power Plants in Washington
| Plant Name | Utility | Location | Balancing Authority | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|---|
| Mint Farm Generating Station | Puget Sound Energy Inc | Longview, WA | Puget Sound Energy, Inc. (PSEI) | 2.3 TWh | Dec 2007 | Dec 2024 | Natural Gas |
| Marengo Wind Plant | PacifiCorp | Dayton, WA | PacifiCorp West (PACW) | 612.6 GWh | Jul 2007 | Dec 2025 | Wind |
| McNary Dam Fish Attraction Project | Northern Wasco County PUD - (OR) | Plymouth, WA | Bonneville Power Administration (BPAT) | 72.5 GWh | Oct 1997 | Dec 2025 | Water |
| Monroe Street | Avista Corp | Spokane, WA | Avista Corporation (AVA) | 87.5 GWh | Nov 1992 | Dec 2025 | Water |
| Main Canal Headworks | Columbia Basin Hydropower | Coulee City, WA | Avista Corporation (AVA) | 105.2 GWh | Dec 1986 | Oct 2025 | Water |
| Mossyrock | City of Tacoma - (WA) | Silver Creek, WA | City of Tacoma, Department of Public Utilities, Light Division (TPWR) | 1.0 TWh | Sep 1968 | Jun 2026 | Water |
| Mayfield | City of Tacoma - (WA) | Silver Creek, WA | City of Tacoma, Department of Public Utilities, Light Division (TPWR) | 602.5 GWh | Feb 1963 | Dec 2025 | Water |
| Merwin | PacifiCorp | Ariel, WA | PacifiCorp West (PACW) | 422.6 GWh | Jun 1931 | Dec 2025 | Water |
| Meyers Falls | Hydro Technology Systems Inc | Kettle Falls, WA | Avista Corporation (AVA) | 8.7 GWh | May 1915 | Dec 2025 | Water |
Browse Power Plants By Washington Counties
Figures are based on December 2025 generation numbers.| County | State Rank | Active Plants | Dec 2025 Generation |
|---|---|---|---|
| Jefferson County, WA | # 30 | 3 | 8.2 GWh |
| Franklin County, WA | # 29 | 3 | 10.9 GWh |
| Yakima County, WA | # 28 | 12 | 269.1 GWh |
| Mason County, WA | # 27 | 3 | 273.6 GWh |
| Stevens County, WA | # 26 | 4 | 302.8 GWh |
| Snohomish County, WA | # 25 | 9 | 359.3 GWh |
| King County, WA | # 24 | 12 | 392.2 GWh |
| Thurston County, WA | # 23 | 4 | 454.8 GWh |
| Adams County, WA | # 22 | 4 | 456.9 GWh |
| Skamania County, WA | # 21 | 1 | 503.6 GWh |
| Spokane County, WA | # 20 | 7 | 560.0 GWh |
| Lincoln County, WA | # 19 | 2 | 624.1 GWh |
| Garfield County, WA | # 18 | 2 | 811.6 GWh |
| Clark County, WA | # 17 | 2 | 812.4 GWh |
| Kittitas County, WA | # 16 | 9 | 1.2 TWh |
| County | State Rank | Active Plants | Dec 2025 Generation |
|---|---|---|---|
| Skagit County, WA | # 15 | 4 | 1.5 TWh |
| Whitman County, WA | # 14 | 6 | 1.8 TWh |
| Pierce County, WA | # 13 | 14 | 2.1 TWh |
| Grays Harbor County, WA | # 12 | 6 | 2.1 TWh |
| Walla Walla County, WA | # 11 | 4 | 3.2 TWh |
| Columbia County, WA | # 10 | 4 | 3.3 TWh |
| Cowlitz County, WA | # 9 | 6 | 3.7 TWh |
| Whatcom County, WA | # 8 | 13 | 4.1 TWh |
| Pend Oreille County, WA | # 7 | 3 | 4.4 TWh |
| Klickitat County, WA | # 6 | 17 | 5.4 TWh |
| Lewis County, WA | # 5 | 8 | 7.3 TWh |
| Benton County, WA | # 4 | 7 | 10.1 TWh |
| Douglas County, WA | # 3 | 1 | 11.7 TWh |
| Chelan County, WA | # 2 | 6 | 13.6 TWh |
| Grant County, WA | # 1 | 9 | 29.8 TWh |