On 1st February 2010 The Government confirmed the feed in tariffs which will come into force on 1st April 2010. For someone fitting a typical 2.5kW photovoltaic solar system to an existing home (at a cost of around £12,500), a payment of 41.3p per KWh generated will be paid whether that electricity is exported or used by the home owner. A further payment of 3p per kWh will be made for each unit not used and therefore exported to the grid. New-build properties fitted with solar panels will receive a lower tariff of 36.1p per kWh generated.
These tariff payments are guaranteed for 25 years and they are also index linked - i.e. they will rise in line with inflation. The typical 2.5kW system will generate tax-free payments of around £1000 per year, and so the payback on the investment will be around 12 years. This also works out as a tax-free return on investement of 8% - far better than any bank account offers, and particularly attractive to those paying tax at the higher rate. Since the electricity generated can be used by the homeowners, they are also rewarded with a £150 reduction in their electricity bill with a 2.5kW system.
Taken from HERE
http://www.decc.gov.uk/en/content/cms/n ... 0_010.aspx