Hydropower is more reliable than other green energy sources.

Solar and wind farms can be easily turned on or off, but they are dependent on the weather and time of day. Therefore, they may not be able to handle peak demands on a day-to-day basis — unless they are augmented by complicated energy storage systems. On the other hand, a reservoir acts as energy storage, as long as it exists there is predictable hydropower.

“HydroFlex’s designs can start and stop a turbine 30 times a day,” says Ole Gunnar Dahlhaug, professor at the Norwegian University of Science and Technology. “This is huge. Traditional turbines can maybe turn on, or off, one to three times a day. If a traditional turbine turned on or off 30 times a day, its fatigue loads would severely reduce its service life.”

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