Cost more. For every kilowatt of power from wind energy you need backup sources of production when the wind ceases. You cannot reduce the capacity of normal power plants.
Very good point. In my neck of the woods (Kansas), the utilities are required to have a ‘baseline’ of reliable power available, which equals or exceeds their peak demand.
And, as you might suspect, the Kansas wind has been eyed by the wind warriors.
So we are getting lots of wind farms, and higher power bills.