Under the Government’s “Feed-in Tariff” scheme, you’ll be rewarded for the amount of solar electricity you generate, whether you consume it or export it to the national grid. And, if you produce more electricity than you need, you can sell it to the national grid. (If you’re not connected to the national grid, excess electricity can be stored to use when you need it.) The Government is introducing a similar scheme for solar hot water in June 2011 – the Renewable Heat Incentive. This will give solar thermal users annual cashback.
Sunlight is free. So, once you’ve paid for the installation of your Solar PV and Solar Thermal system, your electricity or hot water costs will be significantly reduced. A typical solar PV system can produce 40%-50% of the electricity used by a household in a year. A typical solar thermal system can provide around one third of your annual hot water needs.

Solar PV Panels contain no circulating fluids or moving parts so they’re unlikely to go wrong You’ll no longer have to face those hefty repair bills that are often required for conventional electricity or hot water systems.
Solar energy is green renewable energy. It releases no harmful carbon dioxide or other pollutants into the atmosphere. A typical home solar PV panels could save around 1200kg of carbon dioxide per year. That's around 30 tonnes over its lifetime.