How does hydropower work?
Hydropower is the energy of moving water, which can be used to generate electricity. Most hydroelectric energy comes from the potential energy of dammed water driving a water turbine and electrical generator. The power extracted from the water depends on the volume of the water and how far it falls. In 2015, hydropower provided energy for about 17 percent of the world’s total electricity generation. It has the potential to supply as much as 33 percent of the world’s electricity needs, and its use is expected to increase in coming decades.