Dear Khun Netipong,
Attached please find Gas engine generator set site specific technical data sheet and note that the low heating value of the fuel is higher than typical natural gas fuel system capability due to heavy hydrocarbon content (C3, C4, ….).
Your site specific fuel can be used for the gas engine generator set. The maximum power rating (without fan) is around 1749 kW at 25 deg. C ambient temperature and 152 meters above sea level altitude.
Regards,
Singthong