Alder
Hydro power plant in Pierce County, Washington. 51 MW of nameplate capacity across 2 generators, operated by City of Tacoma - (WA).
Also known as Alder Dam Power House · EIA plant 3913
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 51 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- December 1945First generator online
- Operator
- City of Tacoma - (WA)EIA operator ID 18429
- Grid
- TPWRBalancing authority TPWR
- Price nodes
- None linkedNo verified ISO node
- Location
- Pierce County, WA46.8016, −122.3102
- EIA plant ID
- 3913EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Alder produces
Free · EIA-923Net generation, 2025
187 GWh
187,040 MWh, final
Capacity factor, 2025
Not reported
2024: 41.6%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
142.7–251.3
GWh a year. Low 2019, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 188,226 | Not reported | 12 of 12 |
| 2001 | 156,937 | Not reported | 12 of 12 |
| 2002 | 212,997 | Not reported | 12 of 12 |
| 2003 | 194,508 | Not reported | 12 of 12 |
| 2004 | 197,829 | Not reported | 12 of 12 |
| 2005 | 164,028 | Not reported | 12 of 12 |
| 2006 | 227,781 | Not reported | 12 of 12 |
| 2007 | 201,137 | Not reported | 12 of 12 |
| 2008 | 196,604 | Not reported | 12 of 12 |
| 2009 | 25,089 | Not reported | 12 of 12 |
| 2010 | 227,217 | 51.9% | 12 of 12 |
| 2011 | 257,998 | 58.9% | 12 of 12 |
| 2012 | 274,238 | 62.4% | 12 of 12 |
| 2013 | 222,108 | 50.7% | 12 of 12 |
| 2014 | 247,536 | 56.5% | 12 of 12 |
| 2015 | 191,283 | 43.7% | 12 of 12 |
| 2016 | 251,255 | 57.2% | 12 of 12 |
| 2017 | 232,142 | 53.0% | 12 of 12 |
| 2018 | 206,343 | 47.1% | 12 of 12 |
| 2019 | 142,707 | 32.6% | 12 of 12 |
| 2020 | 211,748 | 48.2% | 12 of 12 |
| 2021 | 208,234 | 47.5% | 12 of 12 |
| 2022 | 227,526 | 51.9% | 12 of 12 |
| 2023 | 169,437 | 38.7% | 12 of 12 |
| 2024 | 182,852 | 41.6% | 12 of 12 |
| 2025 | 187,040 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 11 | Conventional Hydroelectric | 26.0 | May 1947 |
| 12 | Conventional Hydroelectric | 25.0 | December 1945 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists City of Tacoma - (WA) as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Alder
More plants operated by City of Tacoma - (WA)
Questions about Alder
How much power does Alder produce?
Alder reported 187,040 MWh (187 GWh) of net generation in 2025.
Where is Alder?
Alder is in Pierce County, Washington, at 46.8016, −122.3102. It is in the City of Tacoma, Department of Public Utilities, Light Division balancing area (TPWR).
Who operates Alder?
EIA-860M for August 2026 lists City of Tacoma - (WA) as the operator (EIA operator ID 18429). The operator is not always the owner.
When did Alder start operating?
Its first generator began operating in December 1945, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page