<Dd> The Vestas V164 has a rated capacity of 8 MW, later upgraded to 9 MW . The wind turbine has an overall height of 220 m (722 ft), a diameter of 164 m (538 ft), is for offshore use, and is the world's largest - capacity wind turbine since its introduction in 2014 . The conventional drive train consist of a main gearbox and a medium speed PM generator . Prototype installed in 2014 at the National Test Center Denmark nearby Østerild . Series production began end of 2015 . </Dd> <Dt> Largest capacity direct drive </Dt> <Dd> The Enercon E-126 with 7.58 MW and 127 m rotor diameter is the largest direct drive turbine . It's only for onshore use . The turbine has parted rotor blades with 2 sections for transport . In July 2016, Siemens upgraded its 7 to 8 MW . </Dd> <Dt> Largest vertical - axis </Dt>

When was the first wind turbine for generating current built