Mossyrock
418 Gershick Road, Silver Creek, WA 98585Plant Summary Information
Mossyrock is ranked #42 out of 1,331 hydroelectric power plants nationwide in terms of total annual net electricity generation.
Mossyrock is comprised of 2 generators and generated 270.2 GWh during the 3-month period between September 2025 to December 2025.
| Plant Name | Mossyrock |
|---|---|
| Utility Name | City of Tacoma - (WA) |
| Location | Lewis County, WA |
| Initial Operation Date | October 1968 |
| Last Update | Dec 2025 |
| Annual Generation | 902.7 GWh |
| Annual Consumption | 3.3 M MMBtu |
| Ranked #790 out of 12,613 Power Plants Nationwide | |
| Ranked #42 out of 1,331 Water Power Plants Nationwide | |
| Ranked #23 out of 133 Washington Power Plants | |
| Ranked #13 out of 70 Washington Water Power Plants | |
| Fuel Types | Water |
| Previous Operator |
City of Tacoma - (WA) (2013 to 2015) City of Tacoma - (WA) (2016 to 2024) |
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Monthly Net Generation for Mossyrock
Monthly Plant Fuel Consumption for Mossyrock
Mossyrock Details
| Summary Information | |
|---|---|
| Plant Name | Mossyrock (3918) |
| Plant Address | 418 Gershick Road, Silver Creek, WA 98585 |
| Utility | City of Tacoma - (WA) (18429) |
| Latitude, Longitude | 46.5347, -122.4247 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | October 1968 |
| Annual Generation | 902.7 GWh |
| Fuel Types | Water |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | No |
| FERC Exempt Wholesale Generator Status | No |
| Regulatory Information | |
|---|---|
| Regulatory Status | Regulated |
| NERC Region | WECC |
| Balancing Authority | City of Tacoma, Department of Public Utilities, Light Division (TPWR) |
| NAICS Code | Utilities (22) |
| Sector | Electric Utility (1) |
| Water Source | Cowlitz River |
| Ash Impoundment | No |
| Transmission / Distribution Owner | City of Tacoma - (WA) (18429) WA |
| Grid Voltage | 240.00 kV |
| Energy Storage | No |
Generator 52 Details Operating October 1968
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 150 MW |
| Nameplate Power Factor | 1 |
| Summer Capacity | 157 MW |
| Winter Capacity | 147 MW |
| Minimum Load | 85 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | October 1968 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Time From Cold Shutdown To Full Load | 1H |
Generator 51 Details Operating November 1968
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 150 MW |
| Nameplate Power Factor | 1 |
| Summer Capacity | 186 MW |
| Winter Capacity | 175.3 MW |
| Minimum Load | 100 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | November 1968 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Time From Cold Shutdown To Full Load | 1H |
Mossyrock Plant Owners
| Owner Name | Address | Generator | Ownership | We couldn't locate any owners for this plant |
|---|
Power Plants with Similar Net Generation
Power plants with a similar annual net generation from Water.
| Rank | Plant Name | Plant Location | Annual Generation |
|---|---|---|---|
| #32 | Colgate | Dobbins, CA | 1.3 TWh |
| #33 | Noxon Rapids | Noxon, MT | 1.3 TWh |
| #34 | Pickwick Landing Dam | Pickwick Dam, TN | 1.3 TWh |
| #35 | Wheeler Dam | Town Creek, AL | 1.2 TWh |
| #36 | Kentucky Dam | Grand Rivers, KY | 1.1 TWh |
| #37 | Safe Harbor | Conestoga, PA | 1.0 TWh |
| #38 | Selis Ksanka Qlispe | Polson, MT | 970.3 GWh |
| #39 | Oxbow (OR) | Oxbow, OR | 965.3 GWh |
| #40 | Davis Dam | Kingman, AZ | 958.2 GWh |
| #41 | Hoover Dam (AZ) | Boulder City, AZ | 927.1 GWh |
| #43 | Watts Bar Hydro | Spring City, TN | 895.6 GWh |
| #44 | Keokuk | Keokuk, IA | 888.3 GWh |
| #45 | Sidney A Murray Jr Hydroelectric | Vidalia, LA | 885.2 GWh |
| #46 | Fontana Dam | Fontana Dam, NC | 879.0 GWh |
| #47 | Holtwood | Holtwood, PA | 866.1 GWh |
| #48 | Cabinet Gorge | Clark Fork, ID | 857.6 GWh |
| #49 | Big Bend Dam | Chamberlain, SD | 813.0 GWh |
| #50 | Yellowtail | Hardin, MT | 798.4 GWh |
| #51 | Round Butte | Madras, OR | 794.4 GWh |
| #52 | Devil Canyon | San Bernardino, CA | 789.9 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Mossyrock.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Alder | La Grande, WA | 182.9 GWh | 19.2 mi |
| Chehalis Generating Facility | Chehalis, WA | 2.3 TWh | 24 mi |
| Cowlitz Falls | Randle, WA | 196.3 GWh | 15.7 mi |
| Frederickson | Tacoma, WA | 87.8 GWh | 37.8 mi |
| Frederickson Power LP | Tacoma, WA | 1.7 TWh | 38.2 mi |
| LaGrande | La Grande, WA | 297.3 GWh | 21.2 mi |
| Longview Fibre | Longview, WA | 235.4 GWh | 38 mi |
| LRI LFGTE Facility | Graham, WA | 32.1 GWh | 31.1 mi |
| Mayfield | Silver Creek, WA | 576.4 GWh | 8.1 mi |
| Merwin | Ariel, WA | 467.3 GWh | 40.4 mi |
| Mint Farm Generating Station | Longview, WA | 2.3 TWh | 38.3 mi |
| Nippon Dynawave Packaging Longview WA | Longview, WA | 272.1 GWh | 38.6 mi |
| Packwood | Packwood, WA | 63.0 GWh | 40.8 mi |
| Port Westward Unit 2 | Clatskanie, OR | 1.1 TWh | 43.3 mi |
| Skookumchuck | Tenino, WA | 2.2 GWh | 22.2 mi |
| Skookumchuck Wind Facility | Rainier, WA | 392.8 GWh | 24.6 mi |
| Swift 1 | Cougar, WA | 534.7 GWh | 34.4 mi |
| Transalta Centralia Generation | Centralia, WA | 3.2 TWh | 25.7 mi |
| Yale | Amboy, WA | 488.4 GWh | 39.7 mi |
| Yelm | Yelm, WA | 33.7 GWh | 32 mi |