The World Sustainable Energy Days is an annual sustainability conference held in Austria. It hosts events in the field of sustainable energy production and use, which covers energy efficiency and energy sources for buildings, industry and transport. The events that take place during the World Sustainable Energy Days presents the latest technology trends, outstanding examples and European strategies and offers opportunities to establish new partnerships. The conference raises awareness of green energy and energy efficiency. Since 1992 every year in Austria and Austria to attend the events – in general the conference attracts between 900 and 1,000 participants from 55-60 countries. In parallel to the World Sustainable Energy Days, the Energiesparmesse, an exhibition and trade show dedicated to renewable energy sources and energy efficiency, is held. It attracts around 100,000 visitors and around 1,000 exhibiting companies. The World Sustainable Energy Days are organized by the O.Ö. Energiesparverband (O.O. Energiesparverband in German), the regional energy agency of Upper Austria.