Bio-energy Village Büsingen
Büsingen4 is the only German town which is an exclave as it is entirely surrounded by the Swiss canton of Schaffhausen, Zürich and Thurgau. It has a population of about 1,450 inhabitants. Since the early 19th century, the town has been separated from the rest of Germany by a narrow strip of land. This and the fact, that Büsingen belongs to the Economic zone of Switzerland, creates a special legal status, one of the reasons why the heating grid was installed in Büsingen.
In 2013, Büsingen installed a small renewable heating grid with solar thermal and biomass boilers as core technologies. The heating grid is supplied with a 1,000 m2 ground-mounted collector field, about 90 m2 facade collectors as well as two biomass boilers with 450 and 900 kW thermal capacity. In the summer, the solar collectors supply most of the heat. In winter heat is supplied by the biomass boilers. This saves woodchips and increases the service life of the boilers, since they do not have to run continuously. The flow temperature of the heating grid is between 75 and 80°C and the return flow temperature is about 50°C. The share of solar thermal energy is about 13%.