I think every home should have it's own flywheel buried under it and solar/wind generators on the roof.
Also, if the water and gas companies are sending us pressurised supplies can small dynamos not be introduced into taps, ovens, garden sprinklers to harness the flow of water/gas?
And it would be good if exercise bikes were fitted with dynamos to offset the carbon footprint of fat people who don't walk anywhere.
There's been talk that energy might one day be generated by solar satellites and beamed down to Earth in the form of microwaves too.