What is the difference between tidal power generation and hydroelectric power generation?

Tidal power generation is a type of hydroelectric power generation. It uses the energy of water to produce electricity. Hydroelectric power stations built on rivers use relatively large water levels and the water levels are essentially fixed. Tidal power plants use the difference in water level between high tide and low tide to produce electricity, and the water height is very limited. In order to improve the efficiency of power generation, tidal power generation often uses two-way high tide power generation. flows through the turbine to generate electricity, and the waste water flows into the inner tank; At low tide, water from the inner reservoir flows through turbines to generate electricity, and the waste water flows into the sea.