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16.8 MW Hydro operating in King, WA
16.8 MW
Nameplate Capacity
1
Generators
unit
Conventional Hydroelectric
Technology
1995
Operating Since
Coordinates
47.6993, -121.7834
County
King, WA
Nearby Plants
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Request a demo →| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | City of Seattle - (WA) | — | — |
| Owner(s) | City of Seattle - (WA) | — | — |
| Status | Operating | — | — |
South Fork Tolt is a 16.8 MW conventional hydroelectric power plant located in King County, Washington. The plant began operating in 1995 and has one generator. It is owned and operated by the City of Seattle. The plant's primary fuel source is water (WAT). South Fork Tolt is ranked 43rd out of 75 power plants in Washington state, and 524th out of 1464 nationally.
The plant operates within the Seattle City Light balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. In the most recent year with available data, South Fork Tolt generated 44,630 MWh of electricity, achieving a capacity factor of 30.2%.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Seattle City Light (SCL)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Municipal
Sector
Electric Utility
3.2K MWh
Latest Month
44.6K MWh
Annual Generation
30.2%
Capacity Factor
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$2,294/kW
Est. Construction Cost
Total estimated cost: $38.5M
Market Position
LMP Node
S_TOLT_1_GEN81GNODE
Pricing Hub
—
Last updated 2026-03-26
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