Hydroelectricity requires water to fall on a turbine and make it rotate. Each turbine has a great spiral shaped chamber called a scroll case that directs the water into the turbine blades. This photograph shows the cranes that are used to lift the generating units up so that they can have maintenance work done on them. This generating unit has the cover taken of and soon will lifted out using the large cranes. The electricity is taken to the users by transmission lines.
Water is discharged from the turbines from shaped draft tubes.
Those tubes lead into chambers that slow down the flow of the water. The water flows through two tailrace tunnels and returns to the river below the dam. W.A.C. Bennett Dam is among the largest of its type in the world.