Alder
Pierce County, Washington · EIA plant ID 3913 · Operator: City of Tacoma - (WA)
Nameplate51MWSummer 51 MW
Generators2in service
Net generation187GWh12 mo to Dec 2025
Capacity factor42%hydro units, summer MW
Heat rate—thermal plants only
First online1945
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 | 156.9 | 34.4% | — |
| 2002 | 213 | 48.6% | — |
| 2003 | 194.5 | 44.4% | — |
| 2004 | 197.8 | 45.0% | — |
| 2005 | 164 | 37.5% | — |
| 2006 | 227.8 | 52.0% | — |
| 2007 | 201.1 | 44.2% | — |
| 2008 | 196.6 | 43.0% | — |
| 2009 | 25.1 | 5.5% | — |
| 2010 | 227.2 | 51.5% | — |
| 2011 | 258 | 58.4% | — |
| 2012 | 274.2 | 61.9% | — |
| 2013 | 222.1 | 50.3% | — |
| 2014 | 247.5 | 56.1% | — |
| 2015 | 191.3 | 43.3% | — |
| 2016 | 251.3 | 56.8% | — |
| 2017 | 232.1 | 52.6% | — |
| 2018 | 206.3 | 46.7% | — |
| 2019 | 142.7 | 32.3% | — |
| 2020 | 211.7 | 47.8% | — |
| 2021 | 208.2 | 47.2% | — |
| 2022 | 227.5 | 51.5% | — |
| 2023 | 169.4 | 37.9% | — |
| 2024 | 182.9 | 40.8% | — |
| 2025 | 187 | 41.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 11 | Conventional Hydroelectric | HY | 26 | 25.8 | May 1947 | Operating | — | coming soon |
| 12 | Conventional Hydroelectric | HY | 25 | 25.2 | Dec 1945 | Operating | — | coming soon |
Owner / operator
Operator: City of Tacoma - (WA). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Tacoma - (WA) | 100.0% | 51 MW |
Nearby plants
Within 80 km.
| LaGrande | 64 MW | 3.5 km |
| LRI LFGTE Facility | 5 MW | 19.4 km |
| Electron | 23 MW | 23.4 km |
| Skookumchuck Wind Facility | 136 MW | 27.5 km |
| Mossyrock | 300 MW | 30.9 km |
| Frederickson | 178 MW | 31.2 km |