i don't get it, countries export electricity for ages. other than money and infrastructure, what are we missing so that we all, as a united humanity, use our sh

i don't get it, countries export electricity for ages. other than money and infrastructure, what are we missing so that we all, as a united humanity, use our shared sun to export, on a daily basis, electricity from the sun lit part of the planet to the other one. why must we still wait on the genius who will revolutionize batteries, considering we already have non stop sunlight. is this lack of political will? or is such a planetary scale effort impossible?