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How many wind turbines are there?

It is customary to divide the wind turbines in four classes, according to the power developed. Let's talk about microeolico for generators who develop a rated power between 400 W and 1 kW, enough energy to meet the needs of a small audience, perhaps in combination with other systems. There is talk of small wind generators for 1 to 200 kW, to suit the needs of a household or small business. They are usually divided into three sizes: S, 1 to 6 kW and 60 kW 6 to M and L, from 60 to 200 kW. The big wind is what we see in some areas of our country and with which we make the wind farms, the so-called wind farm. The poles that support them are as high as 90 meters and each generator generates a power up to 3,000 kW. Finally there are the systems off-shore, those to be installed at sea with towers up to a height of 70 meters and a power range today from 2.5 MW to 4 MW (but more powerful generators are under development that should reach 5 MW ). Speaking of mini and micro wind turbine is worthwhile to make a further division between those using a horizontal rotor and the rotor vertically. The former have a smaller reproduction of the larger ones and thus appear to be of great fans, the second rotor, vertical, do not have propellers, but have a completely different shape and size, however, likely to take advantage of the wind but visual impact is very low and limited the rumoredurante operation. On this type are perhaps the most interesting proposals for small customers, and judging by the variety of proposals, it is expected there is a significant development in this sector in coming years.