Principle of electricity generation of a hydroelectric power plant: taking advantage of the gap between the water surface of the reservoir and the power plant located below the dam, i.e. using the energy potential of the water to drive the turbine and drive the generator to produce electricity.
The principles of tidal power generation and hydroelectric power generation are similar.
Tidal power generation refers to the energy obtained from the rise and fall of the water surface during the day and night. Water is stored in the reservoir as potential energy at high tide and is released at low tide. The difference between high and low tide levels is used to rotate the turbine and drive the generator to produce electricity.
The dam generally does not eject water. Water passes through the tunnelof the turbine to drive the turbine generator to produce electricity. Only when there is an emergency water release during a flood are the gates opened to release the water. The water spray you see on TV doesn't happen every day. If water is released like this every day, it is a waste of hydraulic energy. .