Yelm
Thurston County, Washington · EIA plant ID 3878 · Operator: City of Centralia - (WA)
Nameplate12MWSummer 11 MW
Generators3in service
Net generation32GWh12 mo to Dec 2025
Capacity factor32%hydro units, summer MW
Heat rate—thermal plants only
First online1930
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 | 63.1 | 63.2% | — |
| 2002 | 74.8 | 74.9% | — |
| 2003 | 58.6 | 58.7% | — |
| 2004 | 78.6 | 78.5% | — |
| 2005 | 67.2 | 67.3% | — |
| 2006 | 70.8 | 70.9% | — |
| 2007 | 63.8 | 63.8% | — |
| 2008 | 73.8 | 73.7% | — |
| 2009 | 70.4 | 70.5% | — |
| 2010 | 49 | 49.0% | — |
| 2011 | 77.4 | 77.5% | — |
| 2012 | 76 | 75.9% | — |
| 2013 | 71.6 | 71.7% | — |
| 2014 | 55 | 55.1% | — |
| 2015 | 69.3 | 69.4% | — |
| 2016 | 76.3 | 76.1% | — |
| 2017 | 85.7 | 85.9% | — |
| 2018 | 73.6 | 73.7% | — |
| 2019 | 64.1 | 64.2% | — |
| 2020 | 40 | 39.9% | — |
| 2021 | 30.8 | 30.8% | — |
| 2022 | 0.4 | 0.4% | — |
| 2023 | 26.2 | 26.3% | — |
| 2024 | 33.7 | 33.6% | — |
| 2025 | 32.2 | 32.3% | — |
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 | 3 | 2.7 | Dec 1930 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 3 | 2.7 | Dec 1930 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 6 | 6 | Dec 1955 | Operating | — | coming soon |
Owner / operator
Operator: City of Centralia - (WA). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Centralia - (WA) | 100.0% | 12 MW |
Nearby plants
Within 80 km.
| Skookumchuck Wind Facility | 136 MW | 14 km |
| Skookumchuck | 1 MW | 22.1 km |
| Frederickson | 178 MW | 23.6 km |
| Frederickson Power LP | 318 MW | 23.9 km |
| LRI LFGTE Facility | 5 MW | 26.2 km |
| LaGrande | 64 MW | 28.8 km |