After choosing your energy supplier they will pay you a set rate for ever unit (or kWh) of electricity you generate. When your system has been registered, the tariff levels are guaranteed for the period of the tariff up to 20 years but this may vary check conditions.
You will get a further amount per/kWh from your energy supplier for each unit you export back to the electricity grid, you can sell any electricity that you generate back and get a nice little return. This rate may change over the years as governments make changes as prices fluctuate. At some stage smart meters will be installed to measure what you export, but until then it is estimated as being 50% of the electricity you generate only systems above 30kWp (more for business's) need to have an export meter fitted, and a domestic system is likely to be small.
Small systems will make savings on your electricity bills because generating electricity to power your appliances will mean you don’t have to buy as much electricity from your energy supplier to use them. The amount you get will vary depending on how much of the electricity you use on your site or in your home but having a solar system will save you money.
When you make your decision on your chosen installer and they have installed your generating technology, ask to see if they have a license to register for FITs ask your installer to register you on the central MCS database. The installer will then send you a certificate confirming MCS registration.
Tell your chosen FIT supplier that you wish to register for the FIT and send them a completed application form the MCS certificate for solar PV, the Energy Performance Certificate that shows your home has an energy efficiency rating band D or better.
Will check to see if your installation is on MCS database and undertake other relevant checks before you can use your system. Confirm your eligibility and the date you are eligible for payments from add you to the Ofgem Central FIT Register, which records all installations in the FIT scheme agree with you if and when you will need to provide meter readings and when they will make FIT payments to you – these will form part of your statement of FIT terms.