Whilst Feed-in-tariffs(FiTs) are no longer available for new installations of Solar PV, the Smart Export Guarantee is worth looking at if your installation is producing more energy than you currently use or can store with a battery.
Renewable Heat Incentives (RHIs) are available for Biomass and heat pump installations, the full criteria and rates for Non-Domestic RHI can be found on the Ofgem website.