Waste is a resource. This is confirmed by PreZero, an international environmental services company involved in waste management and recycling. The recovery of organic waste through anaerobic digestion, in particular, is a strategy for the production of biogas and biomethane/RNG in Europe and especially in Spain. Together with PreZero, we discover the role of waste in the production of biomethane/RNG in Spain and which projects the company has undertaken in the country.