Long distance power transmission suffers losses from resistance. Superconductors don't suffer losses. With superconductors you could stick a giant wind farm in

Long distance power transmission suffers losses from resistance. Superconductors don't suffer losses. With superconductors you could stick a giant wind farm in the ocean and cover the Sahara in solar panels. Run distribution lines from there to everywhere else and pretty much call it a day on the planet's power needs. (lots of things glossed over, not the least of which are social and geopolitical but you get the idea)