The purpose of this study aims to be the energy optimization of a A2A Energiefuture project for an organic fraction of municipal solid waste treatment plant located in San Filippo del Mela. The plant is designed to dispose of an amount of about 75’000 tons per year of organic waste. By means of an anaerobic digestion process, and thus in the absence of oxygen, the fermentation of the organic fraction generates biogas and compost. The former, main focus of this study, once treated and filtered to remove impurities, can be injected, in accordance with the ongoing incentives, into the national gas distribution network as biomethane since it is characterized by similar parameters.