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Sorghum is one of the many biomasses that has the potential to be used as the main raw material for cofiring coal with biomass, given its flexibility as a source of carbohydrates, sugar, and lignocellulose. However, biomass can cause serious problems in power plants due to slagging fouling formed by potassium elements which has low melting point. Sorghum biomass and cofiring research is still in its infancy. This study will propose a study on cofiring between sorghum and coal using the SEM-EDS method to analyze the ash from the combustion of a drop tube furnace to determine the characterization of the blend of sorghum and coal up to 10%. According to the results of SEM morphology, the components of the ash of coal and sorghum mixture are dominated by granular shapes of 100 - 200 microns. From SEM-EDS results show that Fe value in Coal decreased when blended with sorghum on both probes 550 and 600. At probe 550 the Fe value in the coal sample was 5.5% while in coal sorghum blended was in the range of 3 – 3.2%. Meanwhile on probe 600 the Fe value in the coal sample is 7.2% while the sorghum mixture is in the range of 3.5 – 4.3%. On the other hand, the K value in blended sorghum coal increases when compared to pure coal but is still within safe limits. [ABSTRACT FROM AUTHOR]