i thought about that as i was thinking my post, but... you still need to build the panels, how green is the manufacturing process? then you need batteries to store power, etc etc.

anyway, with only 3 official days of sunshine in the uk, i'm not sure loar would work!

my father-in-law has a 15m (height) wind turbine on his farm which is pretty pokey. cost is about £20k, 25% grant from the green energy people brought that down a bit. what he doesn't use on the farm goes back into the national grid, which in it's first 1/4 earned him £2k ! paid for in two years barring any major catastrophy. i think it's probably more green than most other options.