Cost savings

England and Wales

A 4kWp system can generate around 3,800 kilowatt hours of electricity a year – roughly equivalent to a typical household’s electricity needs. It will save nearly two tonnes of carbon dioxide every year.

System size
Benefit per year
Carbon dioxide per year
Registered up until 31st March 2014 4kWp £785 1.8 tonnes
Registered on and from 1st April 2014 4kWp £770 1.8 tonnes

If your system is eligible for the Feed-in Tariff scheme it could generate savings and income of around £770 a year if you register before December 2014 (based on a 4kWp solar PV system eligible for a generation tariff of 13.52p/kWh). You will get paid for both the electricity you generate and use, and what you don’t use and export to the grid.


Solar PV needs little maintenance – you’ll just need to keep the panels relatively clean and make sure trees don’t begin to overshadow them. In the UK panels that are tilted at 15° or more have the additional benefit of being cleaned by rainfall to ensure optimal performance. Debris is more likely to accumulate if you have ground mounted panels.