The OERC reported the installed capacity of biogas power in Thailand reached 146 MW. Of this, the power capacity form 74.96 MW form industrial wastewater and 97 MW from pig manure [18]. EPPO [19] reported in March 2010, there are 41 biogas power plants in operation and sale power to grid at capacity of 43 MW, 15 plants in the negotiation period with PEA and MEA (41 MW), 31 plants in acceptable period but not yet signing PPA contract (44 MW) and 33 plants in the construction period and waiting for COD (72MW). Under the 15-years of AEDP , government set targets of biogas utilization in electricity generation in 2022 in three periods ,short-term (2008-2011)at 60 MW, midterm (2012-2016) at 90 MW and long-term (2017-2022) at 120MW,respectively.