"When the gas comes off the digester, it has not only methane in it it also has carbon dioxide And it has a trace of hydrogen sulfide."

VOA: standard.2010.02.23

First, the hog waste is placed in an anaerobic digester, which contains bacteria that consume the manure and release methane gas.

FORBES: Written by John Platt

Thanks to the solar heater, a shower is a daily possibility, and the biogas digester -- which converts human and pig waste to a clean gas that can be pressurized -- has enabled cooking and lighting.

CNN: 'Green' revolution under way in rural China

The anaerobic digester would have used 10, 000 tonnes of locally-grown maize to produce methane gas to convert into electricity.

BBC: Sutton Courtenay energy plant plans withdrawn