I wonder if this isn't looking at things from the wrong perspective? I mean most homes are incredibly inefficient. I know Donnachadh McCarthy and whilst he's a bit weird and annoying, he knows his bacon with regards to energy efficiency. He's managed to tinker with his own home to the extent that his bills are a few pounds a year (£18 last year I think). Nothing illegal, just extraordinarily energy efficient, plus a bit of generating energy at home.
He's about as big a hippy as you'll ever find, so I suspect he didn't spend huge sums on doing this, and doing this kind of thing to the homes of the elderly would not only help them directly, but would also significantly raise the value of the housing stock.
That seems a more practical approach than trying to change the very nature of how energy is produced in the first place. At least that is until solar becomes cheap enough to be installed (or painted most likely) on everyones home.