A comprehensive assessment of the energy and environmental efficiency of using plywood production waste as an energy fuel in steam watertube boilers units with a staged combustion scheme has been carried out. The components of the heat balance and emission of harmful substances are determined. The thermal engineering and granulometric characteristics, as well as the elemental composition of the combustible fuel and the formed focal residues, have been studied. Specific surfaces, porosity of entrainment particles were determined and their microscopic studies were performed. Specific surfaces, porosity of entrainment particles were determined and their microscopic studies were performed. It is concluded that it is necessary to modernize the ash cleaning system, and in the future to reconstruct boilers with the installation of tilt-pushing grids when implementing a layer-vortex combustion scheme.