Hydropower

Hydropower derives from water and has been used for centuries. It is relatively simple as it uses the force of water to turn waterwheels or mills. It is quickly growing as it supports 19 percent of the world's electricity. As a turbine is turned with the force of water, like wind and geothermal energy is generated, the turbine is connected to a generator that produces electricity. Being relatively simple, easy to make, and considering the fact that water is extremely abundant, hydropower is one of the most efficient ways to produce energy. In addition, it doesnt emit any harmful gases. The downside is that it takes a lot of land, to build dams on rivers and may flood multiple regions, which hinders the growth of hydropower. It may be inefficient in cost depending on the situation and region of the river. (USGS, Water)