ENERWOODS aims at strengthening the role of Nordic forestry as a significant contributor to the development of competitive, efficient and renewable energy systems. Woody biomass must contribute more to meet fossil energy independence by 2050 as well as the EU 2020 renewable energy goals, while at the same time securing sustainability and the provision of ecosystem services now and in the future. The complete energy chains from resource to energy services have to be considered when designing bioenergy strategies to maximise climate change mitigation and security of energy supply. Robust analyses of energy systems and biological systems are very complex. Here, the goal is to combine such complex analyses to optimise the complete bioenergy chain considering primary energy use and GHG emissions. Furthermore, the aim is to build a strong and interdisciplinary Nordic research network bridging the fields of forestry and bioenergy research as well as industries and suppliers. Main challenges Five main challenges are linked to meeting the project aim: 1. A considerable increase in forest productivity by e.g. selection of proper forest management models, species, provenances and clones without compromising ecosystem sustainability and stability. 2. Transportation across long distances and large scale storage of woody biomass in optimized systems linking forestry and end-users. 3. Balancing trade-offs between forest carbon sequestration and fossil fuel displacement by cost- and bioenergy-efficient strategies from a land-use perspective. 4.Balancing integration versus separation of forest functions at appropriate scales in a multifunctional and sustainable forest management context. 5. Efficient implementation of the research findings in the management of forests and the woody biomass energy system.