The US Department of Energy (DOE) has published on its website a series on infographics and a great animation showing how wind energy is rapidly gaining pace and its capacity is booming.
In 2003, there were 185 wind farms online, powering the equivalent of 1.6 million homes ; in 2008, there were 416 wind farms online powering 6.5 million homes. In 2012 there were 815 wind farms online powering 15 million US homes.
Yes, you read that right : in ten years the capacity increased ten-fold. Since President Obama took office, the capacity has been multiplied by more than two.