The US department of energy has signed a memorandum of understanding with GE Energy, Siemens Power Generation, Vestas Wind Systems, Clipper Turbine Works, Suzlon Energy and Gamesa Corporation to improve industrial wind power manufacturing capabilities, said a DoE release. US is the fastest growing wind energy market in the world with 30 per cent annual growth in the last five years and with over 25 per cent of the global installed capacity.