Wind energy is energy from wind. The term comes from Latin eolico aeolicus, belonging or Aeolus, God of wind in Greek mythology and, therefore, belonging or on the wind.Conversion into mechanical energyWind energy has been used since ancient times to move boats powered candles or to run the gear moinhos, to move your shoulders. In windmills wind energy was transformed into mechanical energy, used in milling grain or to pump water. The moinhos were used to manufacture of meal and drainage channels, particularly in the Netherlands.Conversion to electricityA wind turbine is a device that takes the wind and the converts in electric power.The vessel Alcyone "turbosail" has been specially designed to receive technology two turbosail of Cousteau.Today the wind to move aerogeradores - large turbines placed in places very wind. These turbines have the form of a catavento or a windmill. That move through a generator, produces electric power. Need group in wind, aerogeradores, necessary for energy production to become profitable, but can be used in isolation, remote locations and transmission network. You can still use of aerogeradores low voltage where requirements limited electricity.Wind energy is now considered one of the most promising natural sources of energy, mainly because it is renewable, i.e. not be exhausted. Furthermore, wind turbines can be used both in connection with electrical and places isolated.In 2005 the world - wide capacity of electrical power generation by wind energy was about 59 gigawatts, - enough to supply the basic needs of a country like Brazil - although this represents less than 1% of world energy use.In some countries, the electricity generated from wind represents significant proportion of demand. In Denmark this represents 23% of production, 6% in Germany and about 8% in Portugal data (September 2007) and Spain. Overall, the generation by wind power more than quadrupled between 1999 and 2005.Wind power is renewable, clean, widely distributed globally, and, if used to replace sources of fossil fuels, helps in reducing greenhouse.The cost of generation of wind power has fallen rapidly in recent years. In 2005 the cost of wind was about one fifth of that cost in the late 1990s, and this fall cost should continue with the rise of production technology of large aerogeradores. In 2003 the wind was the form of energy fastest in the United States.Most of the ways of generating electricity require outstanding equity investments and low maintenance costs. This is particularly true for the case of wind power, where the costs with the construction of each wind turbine can achieve million reais maintenance costs are low and the cost of fuel is zero. In the composition of the calculation of investment and cost in this form of energy take into account various factors, such as the annual production estimated interest rates, the costs of construction, maintenance, location and the risks of generators. Therefore, the calculations on the real cost of production of wind energy differ very, according to the location of each plant.Despite the grandeur of modern windmills, the technology is still the same for 1000 years and soon will be superseded by