South Fork Tolt
20030 Cedar Falls Road S.E., North Bend, WA 98045Plant Summary Information
South Fork Tolt is ranked #43 out of 70 hydroelectric power plants in Washington in terms of total annual net electricity generation.
South Fork Tolt is comprised of 1 generator and generated 13.6 GWh during the 3-month period between September 2025 to December 2025.
| Plant Name | South Fork Tolt |
|---|---|
| Utility Name | City of Seattle - (WA) |
| Location | King County, WA |
| Initial Operation Date | November 1995 |
| Last Update | Dec 2025 |
| Annual Generation | 48.6 GWh |
| Annual Consumption | 176.6 k MMBtu |
| Ranked #4,317 out of 13,301 Power Plants Nationwide | |
| Ranked #483 out of 1,316 Water Power Plants Nationwide | |
| Ranked #87 out of 132 Washington Power Plants | |
| Ranked #43 out of 70 Washington Water Power Plants | |
| Fuel Types | Water |
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Monthly Net Generation for South Fork Tolt
Monthly Plant Fuel Consumption for South Fork Tolt
South Fork Tolt Details
| Summary Information | |
|---|---|
| Plant Name | South Fork Tolt (622) |
| Plant Address | 20030 Cedar Falls Road S.E., North Bend, WA 98045 |
| Utility | City of Seattle - (WA) (16868) |
| Latitude, Longitude | 47.69917, -121.78333 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | November 1995 |
| Annual Generation | 48.6 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 | Seattle City Light (SCL) |
| NAICS Code | Utilities (22) |
| Sector | Electric Utility (1) |
| Water Source | South Fork Tolt River |
| Ash Impoundment | No |
| Transmission / Distribution Owner | City of Seattle - (WA) (16868) WA |
| Grid Voltage | 115.00 kV |
| Energy Storage | No |
Generator 1 Details Operating November 1995
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | S_TOLT_1_GEN81GNODE |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | S_TOLT_1_GEN81GNODE |
| Nameplate Capacity | 16.8 MW |
| Nameplate Power Factor | 0.9 |
| Summer Capacity | 16.8 MW |
| Winter Capacity | 16.8 MW |
| Minimum Load | 1 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
|---|---|
| First Operation Date | November 1995 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 1H |
| Other Planned Modifications | Yes |
| Other Modifications | December 2028 |
| Multiple Fuels | No |
South Fork Tolt Plant Owners
| Owner Name | Address | 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 |
|---|---|---|---|
| #473 | Flambeau Hydroelectric Station | Ladysmith, WI | 50.6 GWh |
| #474 | E J West | Lake Luzerne, NY | 50.3 GWh |
| #475 | Crescent | Crescent, NY | 50.1 GWh |
| #476 | Pejepscot Hydroelectric Project | Topsham, ME | 49.7 GWh |
| #477 | Kingsley | Ogallala, NE | 49.4 GWh |
| #478 | Lockhart | Lockhart, SC | 49.3 GWh |
| #479 | Jordanelle Dam Hydroelectric Project | Heber, UT | 49.3 GWh |
| #480 | Kilbourn | Wisconsin Dells, WI | 49.2 GWh |
| #481 | Browns Falls | Oswegatchie, NY | 49.2 GWh |
| #482 | Sturgeon | Tillson, NY | 49.1 GWh |
| #484 | Peavy Falls | Crystal Falls, MI | 48.4 GWh |
| #485 | Blake | Parishville, NY | 48.2 GWh |
| #486 | Beaver Falls | Ketchikan, AK | 48.0 GWh |
| #487 | Middle Gorge | Bishop, CA | 48.0 GWh |
| #488 | Vischer Ferry | Rexford, NY | 47.1 GWh |
| #489 | Horseshoe Bend Hydroelectric Co | Horseshoe Bend, ID | 46.8 GWh |
| #490 | Wisconsin Rapids | Wisconsin Rapids, WI | 46.4 GWh |
| #491 | Control Gorge | Bishop, CA | 46.4 GWh |
| #492 | Remmel | Malvern, AR | 46.1 GWh |
| #493 | Mojave Siphon | Hesperia, CA | 46.1 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding South Fork Tolt.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Arlington Microgrid | Arlington, WA | 601.0 MWh | 35.9 mi |
| Black Creek | Snoqualmie, WA | 8.7 GWh | 10.9 mi |
| Calligan Creek Hydroelectric Project | Snoqualmie, WA | 12.6 GWh | 8.1 mi |
| Cedar Falls (WA) | North Bend, WA | 53.6 GWh | 19.3 mi |
| Cedar Hills | Maple Valley, WA | 53.0 MWh | 20.7 mi |
| Crystal Mountain | Greenwater, WA | 560.0 MWh | 53.5 mi |
| Darrington | Darrington, WA | 12.3 GWh | 40.3 mi |
| Frederickson | Tacoma, WA | 20.8 GWh | 50.7 mi |
| Frederickson Power LP | Tacoma, WA | 1.6 TWh | 50.4 mi |
| H M Jackson | Sultan, WA | 333.6 GWh | 14.5 mi |
| Hancock Creek Hydroelectric Project | Snoqualmie, WA | 18.3 GWh | 9.8 mi |
| Port Townsend Paper | Port Townsend, WA | 7.7 GWh | 54.2 mi |
| Rocky Brook Hydroelectric | Brinnon, WA | 464.0 MWh | 53.9 mi |
| Snoqualmie | Snoqualmie, WA | 59.2 GWh | 11.3 mi |
| Snoqualmie 2 | Snoqualmie, WA | 106.8 GWh | 11 mi |
| Twin Falls Hydro | North Bend, WA | 59.3 GWh | 18.1 mi |
| University of Washington Power Plant | Seattle, WA | 125.4 MWh | 24.4 mi |
| Weeks Falls | North Bend, WA | 10.7 GWh | 19.4 mi |
| West Point Treatment Plant | Seattle, WA | 14.3 GWh | 31 mi |
| Youngs Creek Hydroelectric Project | Monroe, WA | 12.9 GWh | 6.4 mi |