The GR3 project will promote the use of grass and other herbaceous residues from landscape management as a resource for biogas production in regions of Belgium, Italy, Germany, Denmark and Portugal. The energy potential of these residues remains underutilized across Europe. Barriers are insufficient awareness and acceptance of suitable technologies for the mowing. storage and anaerobic digestion of grass residues, absence or lack of cooperation between stakeholders along the value chain, as well as legal barriers. As a result, weel-adapted supply chains of grass residues to biogas plants remain largely absent in the 5 targeted regions and beyond.