Dam - Most hydropower plants rely on a dam that holds back water, creating a large reservoir. Use of hydropower peaked in the mid-20th century, but the idea of using water for power generation goes back thousands of years. Hydroelectric power generation, drawing on the force of nature, is a method free of CO2 emissions that takes advantage of one of the few energy sources available right in Japan.
A hydroelectric plant generates electricity by means of a water turbine, driven by the force of water flowing down from a higher elevation. Consisting of a power plant built mostly underground plus upper and lower regulating ponds, this type of facility is used to meet peak daytime demand for electricity.

During overnight off-peak hours, water is pumped from the lower pond back to the upper pond, so it can be used again for power generation during the next daytime peak demand period. A water intake dam is expanded or a regulating reservoir is built along the path of water to the power plant, so that the amount of power generated per day or over several days can be controlled by adjusting the amount of water flowing downwards.
If you have ever been white-water rafting, then you've felt a small part of the river's power.
Various types of plants are introduced here, differing in the way they obtain and utilize water. The most common type of turbine for hydropower plants is the Francis Turbine, which looks like a big disc with curved blades.

Floods are another example of how much force a tremendous volume of water can have.Hydropower plants harness water's energy and use simple mechanics to convert that energy into electricity.

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