Biogas is a resource that has enormous potential in Spain and beyond. Biogas technologies convert organic wastes into renewable energy, clean transport fuel, and nutrient-rich natural fertiliser, reducing greenhouse gas emissions and improving energy and food security and air quality. A recent study commissioned by Naturgy, Spain’s largest natural gas distributor, showed a potential for 26,684 gigawatt hours (GWh) of biogas in the country, enough to cover the energy demand of 40% of Spain’s households.