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The plant was rebuilt after the flood of the Colorado River in November 1987.

Using a Francis design, the turbines are capable of electrical production and can also be used for pumped storage, where a reservoir is filled by the turbine (acting as a pump) driven by the generator acting as a large electrical motor during periods of low power demand, and then reversed and used to generate power during peak demand. These pump storage reservoirs, etc. act as large energy storage sources to store "excess" electrical energy in the form of water in elevated reservoirs. This is one of only a few ways that temporary excess electrical capacity can be stored for later utilization.


Open-loop Pumped Hydro Storage


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