With the support from this project, 15,555 biogas digesters have been constructed in rural households in the 20 towns belonging to the city of Haikou in Hainan province. The project helped farmers to build methane digesters where organic matter including manure and wastes are decayed anaerobically. Every household has an average of 2.5 pigs, the manure of which is fed into the digester with a volume of eight cubic metres, producing enough biogas to meet one household's thermal energy demand.

Before the project started, the farmers stored the manure in deep pits with anaerobic conditions for more than three months, which caused large amounts of methane emissions to the atmosphere. The project helps avoid these methane emissions, but also CO₂ from cooking. The biogas produced in the digesters is used for cooking meals and heating water, replacing the use of coal stoves which was used in absence of the project activity.