sentence: Some water turbines are designed for Pumped storage hydroelectricity.
sentences_after: They can reverse flow and operate as a pump to fill a high reservoir during off-peak electrical hours, and then revert to a turbine for power generation during peak electrical demand. This type of turbine is usually a Deriaz or Francis in design.
concept_name: water turbine
headings: Water turbine Theory of operation Pumped storage
categories: Tools Electricity Hydropower