Once your installation has been completed, contact your current energy supplier. They will require your MCS certificate as this shows your eligibility to receive the Feed-In-Tariff. As you will be generating your own electricity, in addition to the funding you will receive from FITs, you will also save on your annual energy bills as you will not have to purchase as much power from your energy supplier.
All installations must be carried out by an MCS Certificated Product And Installer. You Are Entitled To A Slightly Increased Tariff For Both Electricity Generation. Exportation ( Unused Power Sent Back To The Grid) Remains Unchanged.
Please see tariff information on the energy saving trust website. The solar calculator can be found here.