The alternative sources supply only 20% of the power in this country, most of that is hydro.
You could cover this country with solar panels and windmills and it wouldn't be near enough, nor would it be reliable. There are places like Seattle where the sun hardly shines, and like Florida where the wind barely blows.
If this were to be come a reality, most people would be in a permanent cycle brown or blackouts, and forget a manufacturing base.