On top of any money you save by generating your own free energy, there is now an even greater incentive with Feed-in Tariffs (FiTs).
In April 2010 the UK Government introduced the Feed-in Tariff scheme for everyone who uses a solar PV system to generate their electricity. Feed-in Tariffs mean that the main energy suppliers must encourage and reward free and sustainable energy generators in the UK by supplying them with regular payments for any emission-free electricity they produce.
To get Feed-in-Tariffs (FITs) at the standard rate for solar PV your property needs to have an Energy Performance Certificate (EPC) of band D or better. This requirement applies only to new solar PV systems and extensions of existing solar PV systems with an eligibility date on or after 1 April 2012. This is not a retrospective requirement for existing solar PV systems.
WHAT IS AN EPC?
Much like the multi-coloured sticker on new appliances, EPCs tell you how energy efficient a building is and give it a rating from A (very efficient) to G (inefficient). They let the person using the building know how costly it is likely to be to heat and power, and what carbon dioxide emissions there will be. Once produced, EPCs are valid for ten years. The EPC will also state what the energy efficiency rating could be if improvements are made, and highlights cost-effective ways to achieve a better rating.