Slovenia is one of the most forested countries in Europe. More than 57 % of its surface is covered with forests, securing a large potential, which could be used more efficiently, and in greater extend also for energy purposes. Wood is an important raw material in wood industry, in civil engineering, in energy and cellulose industry. Wood usage has been reduced. As a raw material it has been superseded by other materials, especially in energy and civil engineering; this having a bad influence for environment and society. Better exploitation of wood from our forests would have better influence on wood industry, as well on energy. It would enable to rise revenues, new employments, as well at reduce emission from greenhouse gases and bigger self-sufficiency with heat energy. In Slovenia, wood as biomass is used especially in the country; 30 % of population use it. In the last period, the interest to use wood biomass increased, especially because of contemporary technology of acquiring, processing and using wood, as well as because of contemporary systems of heating with good energy results.