Come and discover the sustainable source of the Groningen public heating network. You'll find it nearby at Zernike Campus in Groningen. WarmteStad welcomes you on Saturday, September 21, during the Open Energy Day at the Heat Plant of WarmteStad and at the largest solar thermal park in the Netherlands by Novar. Enthusiastic staff will explain how they provide households in the city of Groningen with an affordable, reliable, and sustainable alternative to natural gas.