Solar Power - Engineering to a Unit Cost

From Vox:

"How cheap? Sivaram and Kann argue that the industry should set a goal of pushing the installed price of solar to 25 cents per watt by 2050 — down from around $3 per watt today. That's a mind-bogglingly low number, and it could require thinking about solar innovation in a radically new way. The industry's current approach to cutting costs might not get us there. We may need experimental new technologies. Or novel ways of integrating solar into our walls and windows. Or robot installers."