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	Wind

	Aero generator
	Anemometer
	Control System
	Yaw System
	Alternator
	Gearbox
	Rotor
	Tower
	Transformer

Geothermal

Coal

Rotor Gearbox Tower Anemometer	Control System Generator Yaw System
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The typical configuration of a wind turbine consists of a metal support structure of either lattice or tubular type bearing a nacelle, or ship, at its top; the nacelle houses the slow transmission shaft, the gerbox, the speed shaft, the electric generator and the auxiliary equipment. At the extremity of the slow transmission shaft and outside the nacelle a rotor is mounted, and it consists of a hub equipped with blades. The aerogenerator begins working with a wind of about 3 m / s (10 km / h) and reaches its full power when it comes to about 17 m / s (50 ÷ 60 km / h).

Wind power is the worldwide most successful source for electricity generation. In the ten years going from 2000 to 2009, wind installed capacity grew at an extraordinary rate, rising from just over 10,200 MW to about 130,000 MW. Furthermore, future perspectives are even more encouraging: indeed, it is estimated that wind farms will attain in 2015 an overall installed capacity of 425,000 MW.
Wind energy can be produced not only in large plants, but also in distributed generation systems. That is to say, through small capacity wind generators (up to 200 kW), capable of feeding homes or businesses and, at the same time, generating power to be injected into the national grid. These systems are particularly suitable for single homes, as well as for agriculture, tourism and small and medium businesses.
Thanks to technological advance and to the introduction of specific incentivating mechanisms, these wind distributed generation systems are increasingly expanding, even if only in areas with sufficient wind speed. In any case, they allow to obtain true economic benefits, while significantly helping to reduce greenhouse gas emissions.