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	Wind

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

Geothermal

Coal

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The average height of a tower is comprised between 40 and 60 meters. The tower may consist of a metal structure the shape of a truncated cone (with an internal ladder that allows to go up and down for maintainance purposes) or of a lattice trellis metal structure.

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.