The project to build a methanisation unit with biomethane injection into the gas network carried by Doué-Métha aims to treat manure from 34 farms and the Bioparc zoological park of Doué-la-Fontaine. The methanisation project will collect and transform carbon from waste into biomethane, in order to inject it into the natural gas network. In total, more than 32300 tonnes of waste will be digested by the methanisation facility. A production of 1775573 Nm3 per year of biomethane at 97 % CH4 is expected, or about 17 GWh PCI with an injection potential of 215 Nm3/h.