Hydropower is water power that is generated by the movement of water, whether it is falling or flowing down a river. Flowing water was used in ancient water mills to power various machines, from saws to cranes and lifts.

Since the beginning of the 20th century, the term hydropower usually refers to generating electricity using water. Hydropower is an efficient and renewable source of power. However, the building of a dam and reservoir can result in a negative effect on the environment. Careful consideration is often given to this information before a reservoir system is actually built.

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