Power Plants in Oregon

Oregon's generating fleet holds 19.2 GW of nameplate capacity as of May 2026, ranking 27th among the 51 state fleets, counting down from the largest. This is capacity — what the equipment could produce running flat out — not generation, which differs because a megawatt of solar and a megawatt of hydro produce very different amounts over a year.

Hydro dominates the state's generation mix, providing 43.6% of total capacity across 63 plants. Natural gas and wind each carry roughly a fifth of the fleet, at 22.7% and 22.2% respectively, while solar makes up 7.3%, battery storage 2.6%, and other fuels 1.7%. The five largest plants are all hydro: John Day at 2,160 MW, The Dalles at 1,820 MW, Bonneville at 1,162 MW, and McNary at 991 MW, followed by the natural gas plant Hermiston Power Partnership at 689 MW.

The fleet spans nearly a century, from River Mill, online since December 1927, to Tower Solar, LLC, which came online in April 2026. The 296 plants counted in service include everything down to sub-megawatt backup generators; capacity, not plant count, measures the fleet's true size.