Wanapum
Grant County, Washington · EIA plant ID 3888 · Operator: PUD No 2 of Grant County
Nameplate1,220MWSummer 1,220 MW
Generators10in service
Net generation5,412GWh12 mo to Aug 2026
Capacity factor51%hydro units, summer MW
Heat rate—thermal plants only
First online2011
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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 | 3,685.6 | 43.4% | — |
| 2002 | 4,757.1 | 56.0% | — |
| 2003 | 4,397.4 | 51.8% | — |
| 2004 | 4,611.7 | 53.4% | — |
| 2005 | 5,005.6 | 58.1% | — |
| 2006 | 5,141.6 | 58.8% | — |
| 2007 | 5,300.1 | 59.7% | — |
| 2008 | 4,725.8 | 52.3% | — |
| 2009 | 4,359 | 47.7% | — |
| 2010 | 4,198.2 | 45.3% | — |
| 2011 | 5,541.7 | 66.7% | — |
| 2012 | 5,186.1 | 60.8% | — |
| 2013 | 5,282.1 | 60.7% | — |
| 2014 | 3,650.7 | 40.3% | — |
| 2015 | 4,998.6 | 54.2% | — |
| 2016 | 5,305.1 | 56.9% | — |
| 2017 | 5,238.3 | 55.9% | — |
| 2018 | 5,337.7 | 55.4% | — |
| 2019 | 4,252 | 41.9% | — |
| 2020 | 5,131.3 | 51.3% | — |
| 2021 | 4,968.7 | 46.5% | — |
| 2022 | 5,409.3 | 50.6% | — |
| 2023 | 4,085.9 | 38.2% | — |
| 2024 | 4,052.9 | 37.8% | — |
| 2025 | 4,437.5 | 41.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 10A | Conventional Hydroelectric | HY | 122 | 122 | Jun 2014 | Operating | — | coming soon |
| 1A | Conventional Hydroelectric | HY | 122 | 122 | Oct 2013 | Operating | — | coming soon |
| 2A | Conventional Hydroelectric | HY | 122 | 122 | Dec 2012 | Operating | — | coming soon |
| 3A | Conventional Hydroelectric | HY | 122 | 122 | Aug 2017 | Operating | — | coming soon |
| 4A | Conventional Hydroelectric | HY | 122 | 122 | Sep 2020 | Operating | — | coming soon |
| 5A | Conventional Hydroelectric | HY | 122 | 122 | Feb 2012 | Operating | — | coming soon |
| 6A | Conventional Hydroelectric | HY | 122 | 122 | Jul 2016 | Operating | — | coming soon |
| 7A | Conventional Hydroelectric | HY | 122 | 122 | Apr 2011 | Operating | — | coming soon |
| 8A | Conventional Hydroelectric | HY | 122 | 122 | Nov 2018 | Operating | — | coming soon |
| 9A | Conventional Hydroelectric | HY | 122 | 122 | Jun 2015 | Operating | — | coming soon |
| 1 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Sep 1963 | Retired Dec 2012 | — | coming soon |
| 10 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Nov 1963 | Retired Oct 2013 | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Sep 1963 | Retired Feb 2012 | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Jun 1963 | Retired Aug 2016 | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Sep 1963 | Retired Aug 2019 | — | coming soon |
| 5 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Sep 1963 | Retired Apr 2011 | — | coming soon |
| 6 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Sep 1963 | Retired Aug 2015 | — | coming soon |
| 7 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Nov 1963 | Retired Jun 2010 | — | coming soon |
| 8 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Dec 1963 | Retired Aug 2017 | — | coming soon |
| 9 | Conventional Hydroelectric | HY | 103.8 | 103.8 | Jan 1964 | Retired Aug 2014 | — | coming soon |
Owner / operator
Operator: PUD No 2 of Grant County. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| PUD No 2 of Grant County | 100.0% | 1,220 MW |
Nearby plants
Within 80 km.
| Royal Slope | — | 3.9 km |
| Vantage Wind Energy LLC | 90 MW | 18.5 km |
| Wild Horse | 273 MW | 25.5 km |
| Priest Rapids | 950 MW | 25.8 km |
| PEC Headworks | retired | 32.3 km |
| Ostrea Solar, LLC | 80 MW | 38.3 km |