The future urban energy systems can move to directions in which bioenergy will play a key role, for example as fuel for space heating, for (back-up) electricity generation, and for mobility (biofuels). A competitive deployment of bioenergy requires sufficient availability of biomass and acceptable costs. As result of the uncertainty in the price developments of bioenergy, the view on the future is uncertain as well. Also in the recent study "Urban electrification - impact of electrification of urban infrastructure on costs and carbon footprint" results were strongly dependent on assumptions on the availability and costs for bioenergy. In this interactive workshop, we sketched the landscape of bioenergy in relation to the urban energy system and develop a joint view on bioenergy availability and cost. The workshop covered the following aspects: * Which types of bioenergy carriers are most suitable in the urban energy system? * What could be the availability of those bioenergy carriers? * What would be typical costs per type of resource and what are the drivers and uncertainties? * What is the role of policy in the cost development of bioenergy and how can the cost gap be bridged?