MCNARY

How MCNARY compares

With 991 MW of capacity, MCNARY ranks 4th among the 130 operating power plants Bywatts maps in Oregon and 4th of the 58 operating Hydro plants in the state. It accounts for about 12% of Oregon's operating Hydro capacity and 6.6% of all operating capacity in the state. Nationally it is the 20th-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1953, it is older than 83% of the 128 operating Oregon plants with a recorded commissioning year. Its operator, USACE NORTHWESTERN DIVISION, runs 13 operating plants in Oregon totaling 6,521 MW. It shares Umatilla County with 11 other operating plants, including HERMISTON POWER PARTNERSHIP and HERMISTON GENERATING PLANT.

EIA-860 lists 14 generators at the site with 991 MW of nameplate capacity, all conventional hydroelectric technology. Net generation was 3,668 GWh in 2024 (a 42% capacity factor), down 21% from 2022. Its generators came online between 1953 and 1957.

Grid neighborhood

The nearest named substation is MCNARY (500 kV), about 1.0 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 17 operating power plants totaling 2,334 MW sit within 25 miles; the largest is HERMISTON POWER PARTNERSHIP (689 MW, Natural Gas).

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