A renewable portfolio standard, passed in 2007, has supported wind power in Illinois, which required 10% renewable energy from electric companies in 2010 and 25% by 2025. At the end of 2011, Illinois had 2743 megawatts (MW) of wind power installed. Illinois has the potential for installing up to 10,000 MW of wind generation capacity; in 2009, it ranked sixth among states for installed wind turbine capacity. Wind maps show that utilizing the 1.2% of the state with the best winds could supply 9,000 megawatts of wind power. This data shows an opportunity for growth and success in wind energy.