BOUNDARY

How BOUNDARY compares

With 1,040 MW of capacity, BOUNDARY ranks 5th among the 126 operating power plants Bywatts maps in Washington and 4th of the 65 operating Hydro plants in the state. It accounts for about 4.9% of Washington's operating Hydro capacity and 3.4% of all operating capacity in the state. Nationally it is the 17th-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1967, it is older than 65% of the 125 operating Washington plants with a recorded commissioning year. Its operator, CITY OF SEATTLE - (WA), runs 7 operating plants in Washington totaling 1,929 MW. It shares Pend Oreille County with one other operating plant, BOX CANYON.

EIA-860 lists 6 generators at the site with 1,160 MW of nameplate capacity, all conventional hydroelectric technology (this page's HIFLD capacity figure is 1,040 MW). Net generation was 3,020 GWh in 2024 (a 30% capacity factor), down 19% from 2022. Its generators came online between 1967 and 1986.

Grid neighborhood

The nearest named substation is BOUNDARY (230 kV), about 0.6 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by BONNEVILLE POWER ADMINISTRATION, under 0.1 miles away. Another 2 operating power plants totaling 77 MW sit within 25 miles; the largest is BOX CANYON (75 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