You can use aluminium instead of copper (see HVDC Gotland). I didn't say it's just about "connecting countries with a common grid". Switching from fossil fuels

You can use aluminium instead of copper (see HVDC Gotland). I didn't say it's just about "connecting countries with a common grid". Switching from fossil fuels to renewable sources is much more challenging than that. However, transmitting lots of power over long distances is doable and cheaper than many people think.