encourage competition among turbine makers. Foreign imports soon flooded China's fledgling market. In a pattern that it would repeat in other industries, the government then required state-owned enterprises to source 70% of their components from domestic firms. Foreign firms continued to invest directly in China, but by 2009 six of the top 10 wind turbine firms were Chinese. This capped off a remarkable growth spurt in domestic firms' share of total sales, from 51% in 2006 to 93% in 2010.