Wanapum
Hydro power plant in Grant County, Washington. 1,220 MW of nameplate capacity across 10 generators, operated by PUD No 2 of Grant County - (WA).
Also known as Wanapum Powerhouse · EIA plant 3888
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1,220 MWNameplate
- Generators
- 10 operatingEIA-860M, August 2026
- Operating since
- April 2011First generator online
- Operator
- PUD No 2 of Grant County - (WA)EIA operator ID 14624
- Grid
- GCPDBalancing authority GCPD
- Price nodes
- None linkedNo verified ISO node
- Location
- Grant County, WA46.8731, −119.9703
- EIA plant ID
- 3888EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Wanapum produces
Free · EIA-923Net generation, 2025
4.44 TWh
4,437,537 MWh, final
Capacity factor, 2025
41.5%
2024: 37.8%
January to July 2026
3.59 TWh
Provisional
Range, 2015 to 2025
4.1–5.4
TWh a year. Low 2024, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 5,040,702 | Not reported | 12 of 12 |
| 2001 | 3,685,563 | Not reported | 12 of 12 |
| 2002 | 4,757,059 | Not reported | 12 of 12 |
| 2003 | 4,397,395 | Not reported | 12 of 12 |
| 2004 | 4,611,704 | Not reported | 12 of 12 |
| 2005 | 5,005,590 | Not reported | 12 of 12 |
| 2006 | 5,141,576 | Not reported | 12 of 12 |
| 2007 | 5,300,140 | Not reported | 12 of 12 |
| 2008 | 4,725,839 | Not reported | 12 of 12 |
| 2009 | 4,358,985 | Not reported | 12 of 12 |
| 2010 | 4,198,171 | 46.2% | 12 of 12 |
| 2011 | 5,541,697 | Not reported | 12 of 12 |
| 2012 | 5,186,124 | Not reported | 12 of 12 |
| 2013 | 5,282,107 | Not reported | 12 of 12 |
| 2014 | 3,650,692 | Not reported | 12 of 12 |
| 2015 | 4,998,580 | Not reported | 12 of 12 |
| 2016 | 5,305,067 | Not reported | 12 of 12 |
| 2017 | 5,238,337 | Not reported | 12 of 12 |
| 2018 | 5,337,728 | Not reported | 12 of 12 |
| 2019 | 4,252,008 | Not reported | 12 of 12 |
| 2020 | 5,131,315 | Not reported | 12 of 12 |
| 2021 | 4,968,662 | 46.5% | 12 of 12 |
| 2022 | 5,409,304 | 50.6% | 12 of 12 |
| 2023 | 4,085,856 | 38.2% | 12 of 12 |
| 2024 | 4,052,946 | 37.8% | 12 of 12 |
| 2025 | 4,437,537 | 41.5% | 12 of 12 |
| 2026 (provisional, partial year) | 3,588,416 | 57.8% | 7 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 |
|---|---|---|---|
| 1A | Conventional Hydroelectric | 122.0 | October 2013 |
| 2A | Conventional Hydroelectric | 122.0 | December 2012 |
| 3A | Conventional Hydroelectric | 122.0 | August 2017 |
| 4A | Conventional Hydroelectric | 122.0 | September 2020 |
| 5A | Conventional Hydroelectric | 122.0 | February 2012 |
| 6A | Conventional Hydroelectric | 122.0 | July 2016 |
| 7A | Conventional Hydroelectric | 122.0 | April 2011 |
| 8A | Conventional Hydroelectric | 122.0 | November 2018 |
| 9A | Conventional Hydroelectric | 122.0 | June 2015 |
| 10A | Conventional Hydroelectric | 122.0 | June 2014 |
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 PUD No 2 of Grant County - (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 Wanapum
More plants operated by PUD No 2 of Grant County - (WA)
Questions about Wanapum
How much power does Wanapum produce?
Wanapum reported 4,437,537 MWh (4.44 TWh) of net generation in 2025, a 41.5% capacity factor on 1,220 MW of nameplate capacity. From January to July 2026 it reported 3.59 TWh, which is provisional.
Where is Wanapum?
Wanapum is in Grant County, Washington, at 46.8731, −119.9703. It is in the Public Utility District No. 2 of Grant County, Washington balancing area (GCPD).
Who operates Wanapum?
EIA-860M for August 2026 lists PUD No 2 of Grant County - (WA) as the operator (EIA operator ID 14624). The operator is not always the owner.
When did Wanapum start operating?
Its first generator began operating in April 2011, 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