fantastic !
At the moment we can't have solar panels as we have a weird pyrimidal shaped roof.

Hopefully smaller, more efficient panels will get round this limitation.

The thing is if national governments passed a law stating that all newly built houses should have solar panels installed. Within ten years most countries would be eletrically independant of other generating methods. Guess pressure from the gas and nuclear lobbies prevents such a sensible thing from happening.

But maybe cheaper, more efficient panels might help make something similiar happen, here's hoping :-)