Experimental firing with BRINI pellets, which are made from teh combustible fraction of household waste, has been carried out in a 10 MW fluidised bed combustion boiler. The results indicate that good combustion effciency was obtained. Emission of polynuclear aromatic hydrocarbons was low. Release of chlorinated organic compounds and dust emission were also at a low level. Experiments to study the effect of firing with a mixture of BRINI and wood chips, in order to reduce HCl emission, were not conclusive because of difficulties in mixing the fuels.