Actually there are a whole host of folks that rely on good solar power... long distance sailors... here is an example: http://www.svmirador.net/SolarPanels.htm

In this particular case the panels supplied enough power while in the Sea of Cortez to run refridgeration, run a water maker, power SSB radio and computer. Frankly sailors can and do live off the grid.

I understand that newer more efficient panels are on the way.

I think the real key to harnessing solar power is to not depend on one single form... the combination of passive solar heating (with passive mass storage), photovoltaics, and even focused arrays for cooking could be the solution for future energy needs.