69115 Heidelberg: Bahnstadt is the largest passive house development in the world and one of the largest new development areas in Germany with 116 ha. Electricity and heat are supplied entirely from renewable energies. 6,500 to 6,800 people will live in Bahnstadt in the future, and 5,000 to 6,000 people will work there. At the end of 2018, more than 4,000 people will live in Bahnstadt. Around 2,450 apartments have already been built - a total of around 3,700 apartments will be built.