Solar Panels

"10 square metres of solar panels will produce around 16,000 kilowatt hours per year of electricity (200 Watts average / 1600 Watts Peak). Assuming a delivered electricity value of 10p/kwh (after carbon taxes and distribution costs), the value of this electricity would be around £1600/year. Assuming a 0% required rate of return and a long lifetime the value of the panel £16,000. Therefore, if solar panels can be installed at a total cost of under £10/WattPeak (£16,000 for all our panels), then they can be (just) economic in the UK."

BTW You can install a solar roof for £5/WattPeak in a good location with a large roof.