These guys managed to capture a 2.2 million volt lightning strike using just a thick piece of Plexiglass. As the lightning strike travels through it, it melts the plastic, leaving an imprint of the strike, called a Lichtenberg figure. Pretty cool, isn't it?

Well, in theory, massive amounts. Finding a way to store it, is still the biggest problem. But to properly visualize what a tiny amount of the energy that the Sun gives to Earth can do, here's a demonstration of a solar furnace melting a piece of steel in seconds. Now that's impressive!