The study combined the information from different sources (Estonian base map and digital soil map, digital forest maps and inventory data from the State Registry of Forest Data and local administrative maps) in order to achieve the results. The researcher took into account non-forest areas as well (traces, drainage roads ect.) to calculate the potential wooden fuel. Special focus of the research was Leisi municipality, as it is the pilotarea in Saaremaa county. Sufficient available wooden fuel resources are available in Leisi to supply the municipality with district heating.