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Vegetal residues constitute the most abundant biomass of our planet. Some 10 11 metric tons are produced annually in the biosphere with an energy content of 2.425 × 1018 kJ. The methods for utilizing biomass residues have always been of great interest, but this interest has recently grown in Europe and the USA, due to the potential value of forest residues as a source of useful energy. The high cost of fossil fuels and technological progress have made possible the appearance of energy development of biomass systems that allow us to obtain energy directly or indirectly by means of combustion, pyrolysis or gasification processes. These development systems are becoming more and more efficient, reliable and clean. Due to this fact, biomass is currently being taken into account as a total or partial alternative to fossil fuels. The target of this work is to quantify and to map the biomass power potential of residual biomass coming from most representative forest species in Bizkaia (Spain), using like tool a Geographic Information Systems (GIS). The quantity of forestal biomass residue (Tons/year) is determined after considering two factors: the quantity of forestal residue (Tons/ha-year) of the main forestall species, and the surface (ha) occupied by such species

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