The Austrian Energy Agency was founded in 1977 as a non-profit scientific association. The main purpose and goal of the AEA is to develop, support and implement measures aimed at a sustainable supply and use of energy. Among the items to be supported are innovative energy technologies (ET), energy-efficient systems (EE), and renewable energy sources (RES). In addition, the Agency participates and co-operates within projects and networks on national, EU and international levels to promote ET, EE and RES in cooperation with other institutions. As it is one of their thematic priorities, the AEA has extensive experience in the energy efficiency policy field, as documented by many projects on the regional, national and international level. Inter alia the AEA is the organisation nominated for the Concerted Action for the Energy Services Directive (ESD) and the Energy Efficiency Directive (EED) in Austria and a member of the European Energy Network. Since 2007, the Austrian Energy Agency has been the national monitoring body for the implementation of the ESD in Austria. The AEA has also prepared the first, second and third energy efficiency action plans for Austria and is involved in the preparation of the implementation of the EED in Austria. As the national energy efficiency monitoring body the AEA has developed a bottom-up and top-down calculation methodology for energy savings as well as an online database for energy efficiency measures.