Forest residues, often referred to as GROT (branches and tops), represent a significant untapped resource for advanced biofuel production. In BioShare’s concept, these materials are processed through pyrolysis or gasification in fluidized bed boilers. Pyrolysis of forest residues produces pyrolysis oil, a liquid intermediary that can be transported and upgraded in refineries. Gasification at higher temperatures produces a synthesis gas that can be further refined into Fischer–Tropsch wax (FT-wax), a high-quality feedstock similar to fossil refinery inputs.
Forest residues are available in large volumes from thinning, final fellings, and forestry operations across Sweden. By integrating conversion units into existing CHP plants, these residues can be transformed into value-added intermediaries instead of being left unused or combusted with low efficiency. The approach not only provides carbon-neutral fuels but also enables polygeneration where district heating, power, and biofuels are produced simultaneously. Nationally, the production potential from forest residues is estimated at 14–19 TWh per year, corresponding to a substantial share of Sweden’s transport fuel demand.