Research shows USA can afford to provide itself with only 80% of the 25% or so energy it consumes as electricity from low carbon wind/solar, assuming recent weather patterns. User AcademicCantaloupe, in the Collapse of Civilization subreddit, 15 Mar 2018
If the US tries to get more than about 80% of energy from solar and wind it will require substantial amounts of multi-week storage to provide reliable power User silence7, in the Information about the world's climate subreddit, 27 Feb 2018