This tool gives estimates based on information you provide, and a number of assumptions to indicate potential benefits. This is to help you decide whether a PV system is for you.
Use of the tool and its outputs is not a guarantee that you will see the exact same fuel bill savings from the installation of your planned system.
The tool does not calculate income from Feed-In Tariffs payments as this scheme has now closed. The Department for Business, Energy and Industrial Strategy (BEIS) is introducing the Smart Export Guarantee (SEG) to pay small-scale renewable energy generators for the electricity they export to the grid. The Smart Export Guarantee will come into force from 1 January 2020.
In the interim some energy suppliers are offering similar deals, paying customers set tariffs for electricity they export to the grid. Each deal is individual and in some cases participation would require metering. Deals may also be time limited or have other conditions which you should consider carefully in order to make the best choice for you.
The Solar Trade Association website lists current deals available.