Hydropower accounts for 6.7% of worldwide production. Using the power of water dates back thousands of years. Water wheels were used during the Middle Ages as the main source for driving large machines. A waterwheel spins as a stream of water, which is being pulled down by gravity, hits its blades. The water wheel converts energy from falling water into power that can be used to do work. It is a clean form of energy which means it is good for the environment
