These conferenceproceedingscontain contributions to one of Europe s largest annual conferences on energy efficiency and renewable energy. From two main fields - biomass and energy efficiency in buildings - contributions offer an insight into the research work and the scientific findings and developments of young researchers from all over the world. The papers were selected by a high-level scientific committee for oral presentation. They also communicate results, trends and opinions that will concern and influence the world s energy experts and policy makers over the next decades. The...