During the World Sustainable Energy Days the poster presentation offered companies and organisations the opportunity to display before a professional audience successful initiatives and projects concerning energy efficiency and renewable energy sources. About 80 companies and organisations have made use of this possibility. The Poster Presentation offered also the opportunity to present results of EU-projects before an international audience. The project could be presented via a poster, a video or a software. A summary of the project (max. 1 page) could be included in the conference proceedings. For the poster English and German could be used.