The Feed-In Tariff (FiT) scheme finished for new applications on 1 April 2019. If applied before that date, you can sell any surplus energy your business has generated back to the National Grid.    The amount of money you’re eligible for from the excess energy you sell depends on a number of factors, including how many solar panels you’ve got. Your supplier must be registered as a FiT licensee to pay you. For the complete list of licensees, visit the Ofgem website.
You can no longer enter the FiT scheme. But you might be eligible for the Smart Export Guarantee (SEG). The new scheme, introduced on 1 January 2020, is similar to the FiT programme, but payments are set by licensees rather than Ofgem.