Clipper Windpower’s advanced electrical system for their Liberty wind turbines is based on the permanent magnet MegaFlux generator. Unlike the industry's most commonly used, doubly fed generators, permanent magnet is simpler, nearly maintenance free, and operates at higher efficiency over a wider range of power output. For more information, visit Clipper Windpower. Also read Leland Teschler's Machine Design article, Green technology: Inside an advanced wind turbine.