The Caux Vallée de Seine biomethane plant is a project carried out by the Engie BiOZ French company in the municipality of Saint-Jean-de-Folleville. The plant produces biomethane from agricultural and agro-industrial waste. Approximately 59 tons of raw material per day are transformed into 218 Nm3/h of compressed biomethane and fed into the local GRDF gas distribution network. The project sees the collaboration of various local actors, and will bring many benefits to the area: the biomethane produced, in fact, corresponds to the consumption of 3,700 inhabitants of the area, will save about 3,800 tons of CO2 per year and the digestate resulting from anaerobic digestion can be used by nearby farms as a fertiliser.