Assoc. Profess. Prasert Rerkkriangkrai, Director and Executive of Energy Research and Development Institute, Chiang Mai University, welcomed the executives from Sakol Energy Company Limited, the private company operating the business on supplying NGV to the natural gas transporting vehicles of PTT PCL on the occasion of visiting and exploring CBG and CSTR from Napier grass at Energy Research and Development Institute-Nakornping, Chiang Mai University, on Thursday 25^th July, 2013