Promoting sustainability by boosting projects enhancing biomass utilization turned out to be a nested type of a wicked problem for the EU, if only for the unbalanced competition for (productive) land and diverse biomasses. Within the EU-scheme of Interregional collaboration it boiled down to develop a coherent set of very regionally specific projects each with a lasting sustainable impact. How to manage it? The EU promoted project development by using a combination of first top-down stratified invitations, and second bottom-up self-organization by the interested parties, backed up with light EU-coaching and basic facilitation, while requiring regional co-funding. It resulted in the ARBOR-project, which comprises of 15 actions, ranging from the realization of gas-grid injection from highroad-verges grass biogas-plants, via synergy park development, till of a city center biomass hub for woodstoves heating system.