Simultaneous production of thermal energy, electric power, and gaseous mixture of CO and H-2, suitable for the methanol synthesis was possible by the application of a solid oxide fuel cell to the catalytic reactor. In particular, large electric power as well as high yields of CO and H-2 were obtained upon the fuel cell reactor where La-0.9Sr0.8Ga0.8Mg0.2O3 perovskite-type oxide was used as solid electrolyte. The high electrical power density as well as the high yield of CO and H-2 were stably sustained over the examined 30 h.