Renewable energy is that obtained virtually inexhaustible natural sources, some by the immense amount of energy they contain, and others because they are able to regenerate through natural means. As major environmental advantages can highlight the emission of polluting gases such as those resulting from the combustion of fossil fuels, responsible for the global warming of the planet (CO2) and rain acid (SO2 and NOx) and the generation of hazardous waste from difficult to treat and that represent a threat to the environment for generations as radioactive waste related to the use of nuclear energy. Other advantages to bring renewable energy are its contribution to territorial balance, since they can be installed in rural and isolated areas, and to decrease dependence on external supplies, renewables are indigenous, while fossil fuels are only found in a limited number of countries. Most competitive renewable energy wind energy It is the energy obtained from the wind, i.e., the kinetic energy generated by effect of air currents, and that is converted into other forms useful for human activities. Currently, wind energy is mainly used for producing electricity using wind turbines. Wind energy is a clean, renewable, plentiful resource and helps reduce emissions GHG replacing thermoelectric-based fossil fuels, making it a kind of green energy. Read more in: eng.