From NOVA PBS, Solar Power:
The amount of solar energy that strike the surface of the Earth in one hour is more than enough to supply every person on the planet with electricity for an entire year. However, there are limits that prevent us from being able to fully take advantage of this energy.
For now, at least! Watch more videos about the sun, including Designing solar panel walls that can recycle & heat greywater and the Stanford Solar Car Project: Racing on Sunshine, an excellent documentary.