Hydroelectric

Hydroelectric energy is energy harness from the movement of water through a turbine. Hydroelectric power is created when the water flows downward into the dam and spins a turbine creating energy there the water flows out of the dam and into the river. Some advantages of hydroelectric energy are, it can be used to generate electricity and power equipment. Another advantage is that the water cycle is driven from the sun so the water put into the river evaporates and rains on higher elevations. It is renewable but we need to conserve it still because we could use it to a point where we are dumping out more water that the sun can evaporate. Some disadvantages are,has to be in locations with large reliable amounts of flowing water. Another downside is dams and technology are expensive to build and maintain as well as it can block the movement of fish between the sea and their spawning grounds.