Not the point actually. It's more that creating enough copper cable for the entire road network would break the copper market entirely. And frankly, all photovoltaics do is cut down on the energy needed from any other sources; simple fact is that even with 100% efficiency in renewable energy generation and distribution the entire Earth can't generate enough solar power or any other combination of renewable energy based energy sources to match the energy demand of the Earth.
You need fossil fuels, nuclear fission, or nuclear fusion to make up the difference, or accept a smaller per person energy budget.
And even if you've done that, fossil fuels are still in general to superior to certain purposes. There's simply nothing else that has such a high energy density in so easily handled and relatively safe form.
You need fossil fuels, nuclear fission, or nuclear fusion to make up the difference, or accept a smaller per person energy budget.
And even if you've done that, fossil fuels are still in general to superior to certain purposes. There's simply nothing else that has such a high energy density in so easily handled and relatively safe form.