Oh yes, it is a good thing to use solar energy whenever possible, for sure. I'm just skeptical on their claims. Why not put solar panels on the side as well for example? Would help with efficiency but probably at a higher cost and with some technical hurdles I guess... Also, mainstream manufacturers are starting to seriously jump the electric "wagon", not sure if there will be a place for a "new Tesla" on the market. Not even sure if Tesla will survive long term (probably not the main goal of Musk anyways). Still, competition is good.