You could power America with renewables from a technical and economic standpoint. The biggest obstacles are social and political - what you need is the will to do it.
Mark Z. JacobsonThere is no need for nuclear. The world can be powered by wind, water and sun alone.
Mark Z. JacobsonA large-scale wind, water and solar energy system can reliably supply the worldโs needs, significantly benefiting climate, air quality, water quality, ecology and energy security ... [T]he obstacles are primarily political, not technical.
Mark Z. Jacobson