For several years, the methanization of fermentable waste for the production of biogas has been chosen by several countries as a complementary source of energy. Given its methane content of around 60%, the biogas thus produced can be used either in combustion in a gas engine, or as cooking gas for domestic needs, and sometimes to produce electricity in cogeneration. The scale-up of a pilot biogas production facility, carried out a few years earlier to contribute to the energy needs of the inhabitants of an urban district. A forecast study based on availability of fermentable material in Fianarantsoa District - Madagascar