An analysis of heat consumption and energy potential of biomass and its differentiation in individual districts of the Lubuskie Province was performed. The demand for heat in the province's rural areas amounts to approx. 18.6 PJ, while the potential of biomass which can be used for energy generation purposes is 8.5 PJ. On this basis, it is estimated that the share of biomass in meeting the heat demand in the province can amount to 45%. To be able to define the spatial differentiation of the share of biomass in meeting the heat demand in the Lubuskie Province, the fuzzy set theory was used. The highest share of biomass in satisfying the heat demand occurs in western districts of the province, while the lowest in land districts situated around the region's largest cities.