A new HyperCoal (ashless coal) power generation system is being developed to introduce coal directly into gas turbine. Solvent deashing process using organic solvent extraction is a key way to develop the system. Solvent extractions were carried out using ordinary solvents to get organic components from coals. It was succeeded in produding HyperCoal (ash content < 0.1%) for seven of nine colas at a laboratory scale. Light cycle oil (LCO) was found to be a useful solvent since it gave similar extraction yields to 1-methylnaphthalene and dimethylnaphthalene. The mechanism of solvent extraction is discussed based on the data of structural analyses.