Selection of Coal Based on Quality Using AHP-TOPSIS Method Combination

Coal is a natural resource, a strategic export commodity, and a top priority in Indonesia. For this reason, having the best quality coal available is necessary. The quality of the coal determines the selling value of the coal. However, selecting coal quality according to certain specifications requires a long analysis and process. The combined AHP-TOPSIS decision-making method can be a solution for selecting coal based on the expected rate. AHP provides output in the form of weights for each criterion in the coal selection process based on coal quality. Furthermore, the consequences from the AHP calculations are used to carry out TOPSIS calculations in ranking quality coal-producing companies. The results of combining the two methods are applied to a decision support system to provide recommendations for the best coal. Coal selection criteria are based on parameters that influence coal quality. These parameters consist of coal moisture content, water content, ash content, volatile matter, carbon content, sulfur content, and calorie content contained in coal. By applying the two methods in this research, the criteria weight values were obtained using AHP, and the recommended type of coal was the first alternative based on the highest preference value from the calculation results of the TOPSIS method.