Energy-optimized buildings represent a focus of our researchers' work—and this from the planning stage onwards. For example, they develop energy and climate protection concepts for municipalities and institutions, accompany scientific research programs and are actively involved in standardization and the introduction and tightening of minimum standards in the field of energy-efficient buildings. In addition, our experts transfer innovative district concepts, building and facade technologies into practical application in customized evaluation programs. The core aspect is the use of demonstration buildings, which make it possible to evaluate both overall concepts and innovative structural and systems engineering components in terms of energy and to make statements about the practicability, energy efficiency and user-friendliness of the structural implementation. The Fraunhofer Energy Alliance is thus an important link between building research and building practice.