 In November 2014, with its subsidiary TerraForm Power, SunEdison purchased First Wind, one of the largest wind power developers in the United States, for $2.4billion.The acquisition added wind energy to SunEdison's capacity, and made it the leading renewable energy development company in the world.In 2015, "MIT Technology Review" named SunEdison #6, and the top energy company, in its annual "50 Smartest Companies" list.