Can't address it overall but some while back I did some calculation on shipping power around the world from wherever the sun was shining. I took the real-world

Can't address it overall but some while back I did some calculation on shipping power around the world from wherever the sun was shining. I took the real-world numbers for the biggest transmission lines--and found the only question being how many nines on the loss percentage. You are fighting two separate forces. Some of the energy is lost to heat in the wires, this is minimized by making the voltage as high as possible--but the higher the voltage the more corona loss there will be.