Jean-Christophe Gilbert is one of four farmers in the GAEC du Champ Fleury partnership, a typical French farm with 160 milking cows and crops on 270ha in Brittany. Yet the farm also does something a lot more unusual: it injects a steady stream of biogas sufficient to heat 525 homes into the national network.

Since September 2015, an anaerobic digester has been producing biogas from organic waste on the farm. There are currently 29 digesters connected to the gas grid in France and this is expected to ramp up as the country implements legislation imposing at least 10% of local renewable sources in utility gas by 2030.