WANAPUM

How WANAPUM compares

With 989 MW of capacity, WANAPUM ranks 6th among the 126 operating power plants Bywatts maps in Washington and 5th of the 65 operating Hydro plants in the state. It accounts for about 4.7% of Washington's operating Hydro capacity and 3.3% of all operating capacity in the state. Nationally it is the 21st-largest of the 1,243 operating Hydro plants in the database. Commissioned in 2011, it is newer than 92% of the 125 operating Washington plants with a recorded commissioning year. Its operator, PUD NO 2 OF GRANT COUNTY, runs 4 operating plants in Washington totaling 1,960 MW. It shares Grant County with 6 other operating plants, including GRAND COULEE and PRIEST RAPIDS.

EIA-860 lists 10 generators at the site with 1,220 MW of nameplate capacity, all conventional hydroelectric technology (this page's HIFLD capacity figure is 989 MW). Net generation was 4,053 GWh in 2024 (a 38% capacity factor), down 25% from 2022. Its generators came online between 2011 and 2020.

Grid neighborhood

The nearest named substation is VANTAGE (500 kV), about 1.5 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by PUD NO 1 OF KITTITAS COUNTY, under 0.1 miles away. Another 4 operating power plants totaling 1,328 MW sit within 25 miles; the largest is PRIEST RAPIDS (956 MW, Hydro).

Computed by Bywatts from HIFLD power plant, substation and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology