The Forestry Commission's Biomass Energy Centre and the Carbon Trust announced the free service earlier this month.
It includes a map-based listing of more than 300 companies that supply wood fuel.
The database is intended to deal with the expected increase in demand following the launch of the RHI last week. The scheme will allow growers investing in biomass boilers, solar thermal panels or heat pumps to receive a fixed-rate payment for the heat they produce.
Forestry Commission information officer Will Rolls, who helped develop the database, said: "Our old wood fuel suppliers listing was one of the most popular areas of the website but we have been struggling to keep it up to date.
"The new map is much clearer and lets the fuel supplier tell potential customers more about the services they offer. We are grateful to the Carbon Trust that, through the Biomass Heat Accelerator, has made it possible."
The database is available at www.biomassenergycentre.org.uk.