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What is the Low Exergy Network?

Berlin wants to be climate-neutral by 2050. With an innovative combination of different technologies Berlin TXL will be an urban laboratory for a carbon-neutral city district. The future-oriented concept of Berlin TXL is called LowEx (Low Exergy) Network. It is operated at temperatures of up to 40 degrees Celsius. Compared with standard district heating with temperatures of at times more than 100 degrees, the losses in the LowEx Network are significantly smaller. Moreover, the low flow temperature now makes it possible to use environmentally-friendly heat sources efficiently.

In the decentralized energy marketplace consumers can in addition feed waste heat from buildings, wastewater, server rooms, and industrial facilities into the Network’s ducting system and receive some remuneration from this. The concept envisages for instance close-to-surface geothermal energy, solar energy systems, and wind power as sources of renewable energy.

An entirely newly-developed urban district offers ideal conditions for this innovative energy concept, as the concept can be incorporated at all planning stages. The operation of the LowEx Network will be taken over by Berlin Stadtwerke and E.ON. In October 2018 the bidding consortium had prevailed in a Europe-wide invitation to tender for the concession for supplying heating and cooling to Berlin TXL.