What is hydroelectricity? Thousands of years ago, they were considered as water mills, described as vertical waterwheels placed in rivers to grind corn into meals. Today they are now described as a renewable source of energy that produces hydroelectricity which uses power to control water to spin turbines generating electricity. At present there are many hydro-electric power stations, providing around 20% of the world’s electricity. How does this energy source work? Well a dam is built to trap water, where there is plenty of water in lakes, rivers, oceans. The water is than flowed through the tunnels into the dam, to turn turbines and drive the generators. These power stations can produce a lot of power cheaply. In countries such as New Zealand and Switzerland hydro electric power provides half the country’s energy needs. Hydroelectric energy is used in many countries around the world, including Brazil, Canada, Russia, Tanzania, Iceland and most importantly China that has the largest generating capacity, than any other countries.
There are so many advantages of hydroelectricity. First of all, hydroelectricity cuts the cost of fuel. The fact that hydroelectricity uses natural resources which, means that hydroelectricity doesn’t need fuel in order to make it work. The other good thing about hydroelectricity is that it does not pollute the air at all. Our world will be so much better and much cleaner if we begin to use hydroelectricity more and more! Though there are many advantages of hydroelectricity there are still a few disadvantages but not as much as non-renewable which our world doesn’t need. The dams are very expensive to build.
However, many dams are also used for flood control, so building costs can be shared. Building a large dam will flood a very large area upstream, causing problems for animals that used to live there. Finding the right place can be