Abstract: Apparatus and method for producing "clean" fuel from coal for general use such as, for example, in combined cycle power generating plants. Bituminous coal is only partially gasified in a carbonizer and gasifier furnace of a boiler to produce and refine the fuel necessary for the combustion turbine portion of the cycle. The remaining ungasified portion of the coal is fed into the furnace of a boiler and burned as solid fuel with combustion turbine exhaust gases. The gas produced for use in the combustion turbine will contain virtually all pyritic sulfur of the coal and this will be removed from the gas before introduction into the combustion turbine. The gas and carbonized coal may be used for other applications than combined cycle power generating plants.