The BIGGEST problem with clean energy

Why can't we work at global level ... the Sun is shining on earth 24/7 in 1 hemisphere at a time ... Why can't the part which is getting the sun generate electricity and supply to the part in dark and vice versa .... East helps the west and the gratitude is returned back the next day :) ... we do not need any batteries in this case .... Need a good participation from all countries, a global power line nework and smart grid .....its doable given that we have laid million miles of fiber for the internet in oceans!