None, other than to serve as one of the most obscene demonstrations of government boondoggles, special interest lawmaking and graft, waste of taxpayer money, assault on environmental legitimacy, damnable ugly things.
This hot weather stretches electrical energy demand for air-conditioning does it not? Are the windmills turning enough in the summer doldrums to justify them as substitutes for reliable energy which must be continuously up and running anyway? Not by our observation. This article at PowerLine summarizes the wind energy boondoggle. Also read the comment section for anecdotes about the states like Iowa that have so many of these monstrosities.