A wind turbine (wind turbine or Wind Power Generation System) is a device that uses the kinetic energy of wind, converting it into electricity. As the process is used a source of endless energy called the resulting energy that renewable energy, and also wind up being used the wind in this process. Wind turbines have become popular quickly to be a source of renewable and clean energy. There are two basic types of wind rotors: the vertical axis and the horizontal axis. The rotors differ depending on its production cost, efficiency, and the wind speed at which they have their greatest efficiency. The aeroeradores with vertical axis rotor are generally more expensive than horizontal axis, because the generator does not rotate following the direction of the wind, only the rotor rotates while the generator is fixed, but its performance is less. Examples of vertical axis rotor type Savonius rotors and rotor-type Darrieus. Wind turbines with horizontal axis rotor are the best known and most used for its greater efficiency, offsetting its higher cost. In this category are the rotors and multipás 2 or 3 blades. The rotors consist of 3 blades are the most used to generate electricity on a large scale are used as a source of renewable energy, these are driven only by lift. These have also more effective for its less air resistance. The power range of the wind turbine extends from 100 W (length of the blades on the order of 1 meter) to about 8 MW (length of the blade that exceeds 80 meters). Learn what are the top 10 wind turbines of the horizontal axis of the world. Let us now see how a wind turbine. As wind energy is captured and “transformed” into usable electricity. For this we will use as a base and illustration a horizontal axis rotor wind turbine consists of three blades to be the most common today in the market. In the composition of this equipment and speaking in a basic way we find the tower, the rotor, the generator and the blades. These are the main components but may have other components such as wind measuring systems, control systems and other mechanical mechanisms. Shovels: capture the wind, making its power to the rotor center. They are built in almost handmade process from materials such as plastics and fiberglass. The design of the blades employs the same technical solutions used by the Air Force in engineering calculations of the wings of the aircraft. Rotor: securing element of the blades that transmits the rotation movement to the slow axis of movement. One of its main components is the hydraulic system that allows the movement of the blades in different positions to optimize the wind turbine or stop altogether. Tower: element that supports the rotor and nacelle at the appropriate time for its operation. Although most are steel towers, as originally built today there are already other models with different types of material. Nacelle: Magazine installed on top of the tower consists of gearbox, chassis, yaw system, electronic control system and hydraulic system. The component with the greater weight of the system. Depending on the wind turbine manufacturer, can exceed 72 tons; Gearbox (gearbox): has the function to transform the rotations of the blades transmit to the low speed shaft (19 to 30 rpm), so that given the high speed shaft spins the generator needs to function (1,500 rpm) ; Generator: converts the mechanical energy of the shaft into electrical energy; Anemometer: measures the intensity, speed and wind direction. These data are read by the control system, which ensures the most suitable position for the turbine. Weathervane: measures the direction of viewing, is responsible for transmitting to the control system the instantaneous position the wind, allowing the wind turbine to remain oriented to the wind in order to optimize the kinetic energy of wind, increasing the power output. The blades rotate with the wind by rotating the rotor which in turn transmits the rotation multiplied by the gearbox to the generator, the generator normally takes in conjunction with a power converter to receive mechanical energy into electrical energy.