Nearly everywhere in the world we find enough water. And water evaporated at the surfaces of the seas, raise up to become clouds and come back as rain. Nearly 20% fall down to the land areas and go back to the sea by the rivers. The hydro energy is used hundreds of years with water wheels in mills, sawmills and other companies. The current generator devised in 1866 by Werner von Siemens and so it was found a way to use the hydro energy to create electrical energy. It is taken the kinetic power from the running and falling water from rivers and dams by using turbines and generators.
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But how much energy can be taken from the hydro energy? Nearly three times more energy then needed in the world can produced if all kinetic power is taken all from the world found in flowing waters. But it is a very complex process. For example if you take one cubic meter of water and let it fall down through a pipe down the Eiffel tower and at the base is a turbine generator you can produce nearly one kilowatt hour. This is enough to use a washing machine one time. But engineers found a way to produce nearly 2800 billion kilowatt hour energy every year. To handle this potential they construct many different hydroelectric power plants. Hydro power is a very important energy source for many countries in the world. After biomass it is the most used renewable energy source. In 2000 around 19% of energy need in the world is found in this source and only 1% in other renewable sources. Norway and Paraguay produce over 90% of their needing with hydrogen power and many others a very big part of it like Austria, Brazil, Venezuela or Canada. One of the positive part of water energy is that it is constant available and efficient.
