By this letter, STFE Co., Ltd., by Mr. Viravat Cholvanich and Mr. Prasong Limsirichai authorized directors, with the power to act on behalf of the Company, hereby appoint Mr. Viravat Cholvanich in his capacity as the authorized person for the company to represent the company and to sign and/or submit contract, agreement, proposal, application and other papers related to founding and investing in KST Power Development Project and Company