Skookumchuck
Thurston County, Washington · EIA plant ID 7259 · Operator: TransAlta Centralia Gen LLC
Nameplate1MWSummer 1 MW
Generators1in service
Net generation0GWh12 mo to Dec 2025
Capacity factor3%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 | 0 | 0.0% | — |
| 2002 | 0.8 | 9.1% | — |
| 2003 | 0.7 | 8.2% | — |
| 2004 | 0.2 | 2.4% | — |
| 2005 | 0 | 0.0% | — |
| 2006 | 0 | 0.0% | — |
| 2007 | 0 | 0.0% | — |
| 2008 | 0 | 0.0% | — |
| 2009 | 0 | 0.0% | — |
| 2010 | 0 | 0.0% | — |
| 2011 | 5.1 | 58.1% | — |
| 2012 | 6.3 | 71.9% | — |
| 2013 | 6.8 | 77.3% | — |
| 2014 | 6.5 | 73.9% | — |
| 2015 | 4.8 | 55.4% | — |
| 2016 | 4.5 | 50.7% | — |
| 2017 | 6.3 | 72.2% | — |
| 2018 | 3.3 | 37.4% | — |
| 2019 | 2.3 | 26.5% | — |
| 2020 | 4.5 | 51.0% | — |
| 2021 | 4.6 | 52.0% | — |
| 2022 | 4.2 | 47.8% | — |
| 2023 | 3.2 | 37.0% | — |
| 2024 | 2.2 | 24.6% | — |
| 2025 | 0.3 | 3.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 1 | 1 | Sep 1990 | Operating | — | coming soon |
Owner / operator
Operator: TransAlta Centralia Gen LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| TransAlta Centralia Gen LLC | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Skookumchuck Wind Facility | 136 MW | 8.5 km |
| Transalta Centralia Generation | 730 MW | 11.1 km |
| Centralia Battery Energy Storage System | — | 12.6 km |
| Yelm | 12 MW | 22.1 km |
| Chehalis Generating Facility | 593 MW | 23.3 km |
| LaGrande | 64 MW | 30.9 km |