Upgrading and dewatering are essential for effective use of low rank coals including brown coal and lignite, because low rank coals have assets, i.e. cheap, abundant, low ash and sulfur contents. However, they have deficits, i.e. high moisture content, low heating value, and high self-ignition tendency when they are dewatered. We have proposed a novel degradative solvent extraction method that realizes both dewatering and upgrading of low rank coals. In 2013, our proposal has been accepted as one of the projects under SATREPS program promoted by JICA-JST and the international collaboration research between Japan and Thailand has been started. The program leader is Dr. K. Miura, Kyoto University in cooperation with Akita University, the Central Research Institute of Electric Power Industry, Kobe Steel Co. Ltd, the Joint Graduate School of Energy and Environment at King Mongkut’s University of Technology Thonburi, and PTT Research and Technology Institute. The method has already showed the ability of dewatering and upgrading for brown coals without losing heating values. Besides, the method has been applied to 8-biomass wastes and showed that the chemical and physical properties of the extracts were highly similar and expected to be utilized in various purposes, for instance a binder for coke making. In the SATREPS program we will demonstrate the feasibility of this method by setting up a small scale plant in PTT-RTI.