A renewable source
A few renewable energy sources
The water used for hydro power does not polute the air or water because it does not produce harmful wastes or poisonous bi products. Also no greenhouse gases like carbon dioxide are produced which makes this source of energy environment friendly. Another advantage for hydro power is that the hydro power does not use any fuel or fossil fuels. The fossils are nonrenewable so their saving is very important to make sure that they do not deplete. In conclusion these are some advantages for hydro electricity.
A disadvantage for hydro power is dams are extremely expensive to build and must be built to a very high standard. Also, people living in villages and towns that are in the valley to be flooded, must move out. The water, while flowing through the dam collects nitrogen which can kill or damage fish and they can also damage the reproduction of fishes thus eliminating the whole species of fish. Hydro power can only be generated in areas with heavy rainfall and sufficient supply of water. Loss transmission is very high sometimes up to 30%. In conclusion these are some disadvantages for hydro power.