Click the picture to find out.
So to have 100% free energy for the entire world, we just have to build 496,905 square kilometers of solar panels. Thats less surface area then the whole county of Spain (504,030 square kilometers).
And we distributed the panels across deserts and areas with almost 24/7 sun, all year around for maximum effect.
To bad it won´t happen anytime soon, people are to stupid to realize this great possibility, they´ll probably just continue to kill each other for profit instead.