Twentymile Pumped Storage - 250 MW

Pre-Design

Proposed above-ground upper reservoir and underground lower reservoir. Net hydraulic head of approximately 1,300 feet expected between maximum water level in the upper reservoir and minimum water level in underground lower reservoir. Upper surface reservoir will have a surface elevation of approximately 7,600 feet msl and will be connected to the lower reservoir via an underground water conveyance system-penstock, access shafts and tunnels, and ventilation shafts, with a new underground power...