Dalekboy

The math still holds up, generally. Particularly as the solar cells can reduce peak needs substantially, which means less need for power station infrastructure and lower cost on the transmission network infrastructure. Cost/enviro wise the most effective power I think is still wind, in Aus at least (where we have so little potential for hydro), but trying to do wind at the residential scale (i.e. individual household systems) is a bit problematic (urban areas tending to have chaotic and turbulent wind conditions). Solar PV doesn't have that problem so much, it doesn't make too much difference where the panels are so long as they're not shaded out. So you can put them right next to where your power's drawn with no reduction of power production.