MHI have constructed and operated 3 large scale methanol plants with the Mitsubishi Gas Chemical (MGC) basic process plus new methanol production technology which obtained from co-working on the development between MHI and MGC, by our chemical process engineering technology, including the Venezuera plant which was completed in 1994. In accordance with the operation records of the 2200t/d Venezuela plant, which involved various advanced technologies, the superiority of the process in regard to high efficiency and less energy consumption has been confirmed. In the new Saudi Arabia 2500t/d plant which is under construction, the SUPERCONVERTER (SPC) was implemented, and the scale up and improvement of efficiency by this current process is thought to be reaching the maximum limit. Also, for achieving larger capacities of 5000 - 10000 t/d, a national project is underway. MHI is involved in the project to establish new methanol process technology for future increased demand of methanol.