The Solar Decathlon is an interdisciplinary student competition. Over a period of two years, student teams develop innovative and structural solutions for the challenges of future living. The aim is to design a building whose energy requirements are met exclusively by solar energy - and to build it in real life. The results of the 18 university teams of SDE 21 will be evaluated on the basis of ten competition criteria and presented in a two-week exhibition in Wuppertal (in summer 2022). Architectural, energetic and innovative demands on the house will be evaluated. The international competition combines social commitment with professional, theoretical and practical learning.