The OÖ Energiesparverband (ESV) is the energy agency of the Austrian region/state of Upper Austria. Upper Austria is a leader in the clean energy transition: 75 % of the electricity, 61 % of all space heating and 31 % of the primary energy come from renewable sources. In addition, greenhouse gas emissions from buildings were reduced by 43 % in 10 years. The agency, which was established by the regional government, drives the energy transition by promoting energy efficiency, renewable energy and innovative energy technologies. It provides comprehensive services to private households, businesses of all sizes and municipalities. Key activities include face-to-face energy advice sessions (10,000 per year), training programmes as well as the development and management of funding programmes on behalf of the regional government. The ESV has issued respectively checked over 150,000 energy performance certificates for buildings. The agency supports energy technology companies in the context of the Cleantech-Cluster (a business network). It is active in European projects and organises the World Sustainable Energy Days, an annual conference that attracts more than 700 participants from 50 countries every year.