Wind and wind energy

Wind energy comes from converting wind or wind flow into energy or electricity using wind generators. Wind power is renewable energy based on the radiation energy of the Sun which causes large scale movements of air masses in the atmosphere. In most of the modern wind turbines the kinetic energy from the rotating blades is converted to electric power. 

Wind conditions vary very much and according to the day, seasons and weather fronts. However, the average power recovered from the wind can be quite constant.  Not all the energy of the wind flowing past a given point can be recovered. A typical wind turbine needs the wind to be more than 3 m/sec to start working and it stops when the wind speed is above 25 m/sec. Once past the wind generator, the wind also still needs some energy to move out of the way of the wind behind it, so not all of its energy can be extracted.  

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