The Roscoe Wind Farm in Roscoe , Texas , is the world 's largest wind farm ( as of October 2009 ) with 627 wind turbines and a total installed capacity of 781.5 MW , which surpasses the nearby 735.5 MW Horse Hollow Wind Energy Center . The Roscoe Wind Farm in Roscoe , Texas , owned and operated by E. ON Climate & Renewables is the world 's largest wind farm ( as of October 2009 ) with 627 wind turbines and a total installed capacity of 781.5 MW , which surpasses the nearby 735.5 MW Horse Hollow Wind Energy Center .