Weeks Falls
King County, Washington · EIA plant ID 54387 · Operator: Eagle Creek RE LLC
Nameplate4MWSummer 4 MW
Generators1in service
Net generation11GWh12 mo to Dec 2025
Capacity factor29%hydro units, summer MW
Heat rate—thermal plants only
First online1990
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 10.9 | 30.4% | — |
| 2002 | 12.8 | 16.8% | — |
| 2003 | 11.8 | 36.5% | — |
| 2004 | 11.7 | 31.8% | — |
| 2005 | 8.1 | 22.3% | — |
| 2006 | 12.7 | 34.7% | — |
| 2007 | 13.4 | 36.4% | — |
| 2008 | 12 | 32.5% | — |
| 2009 | 12.3 | 33.6% | — |
| 2010 | 13.2 | 36.0% | — |
| 2011 | 15.8 | 43.0% | — |
| 2012 | 17.1 | 46.4% | — |
| 2013 | 14.7 | 40.0% | — |
| 2014 | 16.4 | 44.6% | — |
| 2015 | 8.5 | 23.1% | — |
| 2016 | 11.1 | 30.1% | — |
| 2017 | 13.6 | 37.1% | — |
| 2018 | 14.6 | 39.7% | — |
| 2019 | 9.5 | 25.8% | — |
| 2020 | 15.7 | 42.6% | — |
| 2021 | 14.4 | 39.1% | — |
| 2022 | 12.4 | 33.8% | — |
| 2023 | 8.8 | 23.9% | — |
| 2024 | 13.1 | 35.5% | — |
| 2025 | 10.7 | 29.0% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | HY | 4.3 | 4.2 | Jun 1990 | Operating | — | coming soon |
Owner / operator
Operator: Eagle Creek RE LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| South Fork II Associates, LP | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Twin Falls Hydro | 24 MW | 3.2 km |
| Black Creek | 4 MW | 8.8 km |
| Cedar Falls (WA) | 30 MW | 10.2 km |
| Hancock Creek Hydroelectric Project | 6 MW | 15.7 km |
| Snoqualmie | 13 MW | 18.5 km |
| Calligan Creek Hydroelectric Project | 6 MW | 18.8 km |