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Wind energy
A modern windmill is called 'wind turbine' and the sails are called 'rotor blades'. Wind turbines have three, two or even only one rotor blade. The taller the blades, the higher the energy production.
Currently, wind energy is the fastest growing energy source in the world with an average annual growth of 20 to 30%. World wide wind energy capacity has passed 10,000 MW.
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