You are already discussing the details. I am thinking more fundamentally. The approach of freedom is: I decide whether photovoltaic or not. Whether olive or thuja or beech. Whether SUV or Polo, whether Tesla or Audi, whether plane or train. Or bus. - The state may promote one direction, through subsidies or something else, but has neither to punish nor even forbid the other. Why not? Because it has no duty to educate! Freedom precedes order.....K.