The first thing anyone thinks of when they hear the term ‘renewable energy’ is probably solar. Why wouldn’t they? The sun is bombarding the earth with more raw power every second than we’ve ever managed to spend in a year. But the problem was never a lack of it; it’s always been harnessing and storing the stuff. Luckily, solar panels are getting cheaper and better at an alarming clip. But what if we could harness the sun’s energy in space? It’s always there, after all, in waves not filtered and diluted by the fickle atmosphere (which reflects 30% of it back into space anyway).
The basic idea would be to construct enormous solar farms which would collect the sun’s high-energy radiation and use mirrors to deposit the energy into smaller collectors, which would then send it to Earth in the form of microwaves or laser beams. As of right now, this technology is prohibitively expensive. But maybe it won’t be for long. After all, companies like SpaceX are constantly engineering ways to drive down the cost of sending cargo into space, so hopefully we’ll be running out of excuses not to build one of these world-changing (and charging) behemoths in our lifetime.