GridPlants

Wanapum

HydroelectricWashingtonFirst unit online 2011

Wanapum is a hydroelectric plant in Grant County, Washington, operated by PUD No 2 of Grant County (WA). It ranks fourth by nameplate capacity among Washington’s 138 power plants. Among the 1,390 hydroelectric plants in the country it is the eighth-largest. Retired units here add up to 1,038 MW across 10 units, taken out of service between 2010 and 2019.

Nameplate capacity, 2025

1,220 MW

1,220 MW net summer capacity

10 operable units

  • Hydro1,220 MW100%

Unit by unit, 1963 to 2025

operating in 2025retiredbar height follows unit size

2 units Hydro, 208 MW, 1963, retired by 2012
Unit 10 Hydro, 104 MW, 1963–2013
Unit 3 Hydro, 104 MW, 1963–2016
Unit 4 Hydro, 104 MW, 1963–2019
Unit 5 Hydro, 104 MW, 1963–2011
Unit 6 Hydro, 104 MW, 1963–2015
Unit 7 Hydro, 104 MW, 1963–2010
Unit 8 Hydro, 104 MW, 1963–2017
Unit 9 Hydro, 104 MW, 1964–2014
Unit 7A Hydro, 122 MW, 2011
2 units Hydro, 244 MW, 2012
Unit 1A Hydro, 122 MW, 2013
Unit 10A Hydro, 122 MW, 2014
Unit 9A Hydro, 122 MW, 2015
Unit 6A Hydro, 122 MW, 2016
Unit 3A Hydro, 122 MW, 2017
Unit 8A Hydro, 122 MW, 2018
Unit 4A Hydro, 122 MW, 2020

Among Washington’s plants

Largest plants in the state by nameplate capacity, with the plants ranked next to this one.

  1. 1Grand Coulee6,809 MW
  2. 2Chief Joseph2,456 MW
  3. 3Rocky Reach1,349 MW
  4. 4Wanapumthis plant
  5. 5Columbia Generating Station1,200 MW
  6. 6Boundary1,160 MW

All power plants in Washington

Other rankings

All US power plants
216th of 14,286
Hydroelectric plants in Washington
4th of 72
Plants run by PUD No 2 of Grant County (WA)
1st of 2
Biggest single unit, among Washington’s plants
31st of 138

Operable units

UnitTechnologyNameplateSummerOnlineStatus
7AHydro122 MW122 MW2011Operating
5AHydro122 MW122 MW2012Operating
2AHydro122 MW122 MW2012Operating
1AHydro122 MW122 MW2013Operating
10AHydro122 MW122 MW2014Operating
9AHydro122 MW122 MW2015Operating
6AHydro122 MW122 MW2016Operating
3AHydro122 MW122 MW2017Operating
8AHydro122 MW122 MW2018Operating
4AHydro122 MW122 MW2020Operating

Retired units

UnitTechnologyNameplateIn service
7Hydro104 MW1963–2010
5Hydro104 MW1963–2011
1Hydro104 MW1963–2012
2Hydro104 MW1963–2012
10Hydro104 MW1963–2013
9Hydro104 MW1964–2014
6Hydro104 MW1963–2015
3Hydro104 MW1963–2016
8Hydro104 MW1963–2017
4Hydro104 MW1963–2019

Grid and site

Balancing area
Public Utility District No. 2 of Grant County, Washington
Reliability region
Western Electricity Coordinating Council
Highest grid connection voltage
230 kV
Water source
Columbia River
Nearest town on record
Beverly
Operator type
Utility
Coordinates
46.873°N, 119.970°W

Closest plants

PlantRuns onCapacityDistance
Vantage Wind Energy LLCWind90 MW11.5 mi northwest
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Priest RapidsHydroelectric950 MW16.0 mi south
Penstemon Solar ProjectSolar5 MW26.1 mi west
Camas Solar ProjectSolar5 MW26.1 mi west
Goose Prairie SolarSolar80 MW27.0 mi southwest
RozaHydroelectric12.9 MW29.8 mi southwest
Rock IslandHydroelectric629 MW33.2 mi north

See every hydroelectric plant in Washington in the plant finder Hydroelectric plants nationwide