What Happens to Solar Power When the Sun Doesn't Shine?

http://www.good.is/post/what-happens-to-solar-power-when-the-sun-doesn-t-shine/

The article says that by using larger groups of linked in solar panels the effect of cloud cover can be reduced. I wonder if all houses had solar panels installed the amount of energy that could be saved, it only makes sense, the sun has been powering the planet since day one.