Hydroelectricity is power generated by the movement of water using generators. When water is released it is forced down pipes that lead to turbines causing them to turn. Generators are connected to these turbines so when they turn so does the generator. This produces electricity. Currently, this renewable energy source makes up 1/6 of the world’s electricity. Producing less pollution then that of the fire produced when using steam engines, hydroelectricity is a great alternative to non-renewable resources like coal and oil.
The advantages of hydroelectric energy beyond the fact that it is green, renewable energy, are that it is usually a very predictable and stable way of generating electricity. Compared to wind or solar, some hydroelectric pumps or dams can control the amount of water they use to produce electricity. They can often hit their capacity within 2 minutes of operation and can be switched off quickly.
There have been studies into using hydro power in unison with other renewable energy sources because it can be turned on and off very quickly. Helping other less reliable energy sources meet power needs within a small amount of time.
Supposedly hydroelectric generators also have a much longer life span too. The generator of a hydroelectric plant can last up to 100 years!
Unfortunately, like most renewable energy sources there are disadvantages of hydroelectricity. Although producing very little pollution and not contributing to carbon emissions.
Possibly the biggest disadvantage would be the amount of money it takes to develop a hydroelectric project can be very high. They will also need permission to be built and that is never a fast process!
They can also damage the local environment, like the Three Gorges Dam in China, which flooded a huge area causing 1.2 million people having to be moved.
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