Coal is reacted in a furnace 22 to obtain a coal gasification gas. The coal gasification gas is cooled by a gas cooler 23, passed through a porous filter 24, and desulfurized by a desulfurizer 25 to produce a CO-containing gas as an anode. The CO gas-containing gas is subjected to an exothermic reaction in a shift reactor 26 to form H2 and CO2, and the anode gas containing H2 is supplied to an anode 7 of MCFC 2. Thus, in the absence of an extra heat source and a heat exchange source, a desired anode gas is obtained from the coal gasification gas, and with heat buildup of the MCFC 2 being inhibited and its performance being maintained, reduction of CO2 is taken into consideration. A power generating plant equipped with the MCFC 2 capable of using a coal gasification fuel substantially containing a CO gas is thus achieved.