Phase III
The U.S. had a 1,060 GW generation capacity in 2015 with a consumption of app. 537 GW (not counting some private generation). To supply this amount of power would take 15,531 wind farms.
The 2015 usage of 537 GW at $.05/KW hour would have a yearly income (less O&M) of $235.2b. This should pay off the capital cost plus interest in 8.5 years while allowing the average utility to increase its earnings by 6%. After 9 years, the cost of renewable electricity would be lower than that of fossil fuel produced electricity today.
If this project were done on a national scale, in 9 years the U.S. would cut its emissions by approximately 50%.