At the upper end of Planetary Wind Power estimates, there are thousands of TW just over our heads, begging to be tapped. However, there are skeptics as well, and academic debate raged a decade ago, that still simmers; but consensus is that there are a few nice TW at least, and ongoing reanalysis suggests the hyperabundance view is correct, but the environmental impacts must be carefully understood.

Here is the classic skeptic side-

https://www.mpg.de/4689869/high_wind_low_energy

Can't wait for PaulP to weigh in...