In the Thai province of Phattalung, 18 pig farmers, feeding their pig slurry into a biodigester, donate their surplus biogas free of charge to the local community. The 2,822 cubic meter central gas storage connects to a plastic piped grid reaching 1,500 households in the Praekha community. Bio-digestion is a compulsory manure treatment for pig farmers with 5,000 pigs or more, and is recommended to all pig farmers contracted by Charoen Pokphand Foods in Thailand.
The farmers use the biogas mainly to generate electricity to provide lighting and to operate equipment and appliances within their farms. One farmer reported saving up to 50 percent of his electricity expense. He also gained extra income by selling sun-dried bioslurry as organic fertilizer. Bioslurry from other digesters is distributed through pipelines, again free of charge, to fertilize nearby palm oil orchards. Important co-benefits of the digestion of pig slurry include the elimination of unpleasant odour and the prevention of waste water leaching to the environment.
It is estimated that villagers substituting LPG with biogas, save over 10 US dollars per household per month; adding up to 180,000 US dollars per year for the whole community. The villagers only pay a small maintenance fee to use the local grid. The central gas storage has been funded by the provincial office of energy.