Felling residues like branches, sticks and tops (GROT) are a form of renewable resource that can be used to replace fossil fuels.
Of the biofuels used in Sweden, the vast majority is derived from forests. Biofuel from forest also includes energy forests and by-products from the forest and wood industry, such as bark, and chips. Other sources of biofuels in Sweden are waste, peat and farm fuels. Biofuel accounts for about one fifth of Sweden’s energy supply according to the Swedish Energy Agency. GROT is primarily used as fuel in heating plants.
The annual take out of GROT from Bergvik Skog’s land is just over 480,000 m³sk, which is used for the production of biofuels. This corresponds to electricity to approximately 27,000 electricity heated houses for one year. In the future, we see good opportunities to increase the output and to increase the production of biofuels.
When GROT is taken out from Bergvik Skog’s land, this should be done while maintaining the previously taken cultural and environmental considerations. Nor should driving damage be caused due to the need for further driving on the ground with forestry machines. The basic principle is that the outtake of GROT should never be so large that compensatory fertilization is required. In addition, it is important to leave coarser branches and tops of birch and that all tops and branches of other deciduous trees are always left in the stand.
Energy from the Left-overs
Text and photo from the Swedish Forest Industries Federation
Residual products from forestry, such as fuel chips, are used as fuel in combined heat and power plants. It provides bio-based electricity and heat, where up to 90 percent of the fuel’s energy content is used.