I have to echo the statement that PV is going up like crazy -- at least where I live. Admittedly I'm in one of the sunniest places in Japan (and at 34 degrees latitude to boot). They are clear cutting forest to put up installations everywhere. Virtually every single apartment building already has solar panels on top of them. Every house builder offers solar panels on new houses and while I've seen a couple of new houses without them, they are definitely the exception. Every electronics store sells solar panels and usually it is the thing that they are pushing hardest (weird to see huge solar panel displays next to the refigerators and TVs). I've done the math and with the price of electricity we pay here, it is a complete no brainer to get solar panels. If I lived in a house, I wouldn't even think twice.