Major US DOE studies this year have looked at the falling price for wind energy and the improving technology for capturing wind at high elevations.  This study, from Bentham Paulos, looks at those aspects and advances the idea that wind energy could be an important component for states in meeting Clean Power Plan goals:

http://www.greentechmedia.com/articles/read/wind-power-wins-big-under-the-clean-power-plan