For Ukraine, solid fuel energy, which is capable of using local coal and fuel biomass, is a critical factor in stable heat and power supply and load regulation in the power system. However, the deterioration of TPP and CHP equipment causes significant deviations of furnace processes from the calculated ones. The project involves improving methods for preventing critical deviations in furnace processes, developing methods for low-cost modernisation of TPP and CHP boiler units to increase their efficiency and reliability, methods for reconstructing anthracite boiler units with their conversion to gas coal, and methods for reconstructing gas and oil boilers with their conversion to solid fuel combustion.