Flammability and calorific power changes during the year for forest waste from several species existing in Galicia (NW Spain) are studied. Measurements were made using a static bomb (calorific values) and an epiradiator (flammability). Simultaneously, thermochemical parameters, such as chemical composition, moisture content, density, and ash percentage, as well as bioclimatic indexes were determined. The results so obtained, with calorific values exceeding 19 500 kJ kg(-1) and average flammabilities of 2, make it advisable to use these materials as alternative fuels in different plants for electric power production.