The powerplant at Big Bend dam consists of 8 fixed blade turbines with a maximum power generation capability of 494,320 kilowatts.

Oahe Dam and Reservoir on the Missouri River are located near Pierre, South Dakota. Lake Oahe has played a pivotal role during the 2018 runoff season allowing releases to be reduced from reservoirs downstream following heavy rain events and capturing flood waters from upstream mountain snowmelt and heavy rainfall in the Yellowstone River basin, which fell in May and June.

Power generation began at Big Bend Dam in 1964 and the entire complex was completed in 1966. Big Bend hydroelectric power plant is operated to meet peak demands for electricity in the Missouri River Basin. The power plant houses eight units with combined maximum generation capacity of 494,320 kilowatts. This is enough power for about 95,000 homes. The first unit went into operation in 1964 and by 1966 all eight generators were producing commercial electricity.