A PFBC-power plant comprises a pressure vessel (2), which encloses a combustor (1) for combustion of a particle-like fuel in a pressurised fluidised bed, and at least two gas turbines (14, 20) located successively in the path of the flue gases produced by said combustion. The plant comprises also an arrangement (9-11) for supplying a fuel to a chamber (23) located in the flue gas path between the two gas turbines and a burner (35) for combustion of the fuel in this chamber for mixing the hot gases resulting therefrom with the gases expanded in the first gas turbine (14) so as to increase the temperature thereof before they are fed to the second gas turbine (20).
