We have developed the sewage sludge drying and pelletizing process that transforms sewage into low water content (less than 10%) and spherical pellet. This report introduces the description of the sewage sludge drying and pelletizing process, quality of dried sludge pellets, the basic results of the co-firing test of dried sludge pellets with coal in pulverized coal-fired furnace and municipal solid waste incinerator. It is concluded that dried sludge pellets had low water content and about 1/2～2/3 of heat value of coal. Also, co-firing of dried pellet results in good operation in pulverized coal-fired furnace and municipal solid waste incinerator.