Sintex Industries in India has introduced a biogas digester that will use animal dung, human excrement, and kitchen scraps to produce enough methane to provide a family of four to cook all their meals, as well as sludge for fertilizer.
The future can be glimpsed on a dusty, rutted road in a poor South Delhi neighborhood. Here 1,000 people use an immaculately clean public toilet constructed by a nonprofit foundation, the Sulabh Sanitation Movement. The biogas digester attached to toilets provides cooking gas for a 600-student school and vocational-training program.
This not only provides free energy, it eliminates the obvious sanitation problems caused by the common practice of open defecation in India.