<P> There are different size classes of wind turbines . The smallest having power production less than 10 kW are used in homes, farms and remote applications whereas intermediate wind turbines (10 - 250 kW) are useful for village power, hybrid systems and distributed power . The world's largest wind turbine, an 8 - MW turbine located at the Burbo Bank Extension wind farm in Liverpool Bay, United Kingdom, was installed in 2016 . Utility - scale turbines (larger than one megawatt) are used in central station wind farms, distributed power and community wind . </P> <P> For a given survivable wind speed, the mass of a turbine is approximately proportional to the cube of its blade - length . Wind power intercepted by the turbine is proportional to the square of its blade - length . The maximum blade - length of a turbine is limited by both the strength and stiffness of its material . </P> <P> Labor and maintenance costs increase only gradually with increasing turbine size, so to minimize costs, wind farm turbines are basically limited by the strength of materials, and siting requirements . </P> <P> Typical modern wind turbines have diameters of 40 to 90 metres (130 to 300 ft) and are rated between 500 kW and 2 MW . As of 2014 the most powerful turbine, the Vestas V - 164, is rated at 8 MW and has a rotor diameter of 164m . </P>

How fast does the tip of a wind turbine spin