TENP flow reversal project

The TENP pipeline system moving natural gas from the Netherlands to Switzerland and Italy will in future be reversible, i.e. the gas will be able to flow both from north to south and from south to north. The piping system at the Hügelheim compressor station, which controls gas flows along the TENP pipeline, will be modified as required for two-directional flow. The TENP flow reversal project is also part of the planned transition from L-gas to H-gas, which will help ensure the security of gas supply to Germany. This transition from L-gas to H-gas will allow the declining production of low-calorific L-gas to be replaced by new sources of supply and transmission routes for high-calorific H-gas. For TENP, these new sources of supply are located in southern Europe and north Africa.

The scope of work for this reversal project includes the installation of four additional DN 900 isolation valves complete with the connecting pipework on the premises of the Hügelheim compressor station. The project is part of Germany’s Gas Network Development Plan 2015 and is also funded by the EU as a Project of Common Interest (PCI).*

TENP gas transmission system

The TENP (Trans-Europa-Naturgas-Pipeline) system is a major European north-to-south transmission axis linking the Netherlands, Belgium, Germany, Switzerland and Italy for cross-border gas transit.

The TENP system includes four compressor stations to maintain the pipeline pressure and enable the required throughput of natural gas. From north to south they are: Stolberg (North Rhine-Westphalia), Mittelbrunn (Rhineland-Palatinate), Schwarzach (Baden-Württemberg) and Hügelheim (Baden-Württemberg).

The Hügelheim compressor station will play a key role for two-directional gas flow, particularly for the volumes entering Germany from Switzerland, because it is the closest station to the Swiss border for increasing the pipeline pressure.

The project is managed by Trans Europa Naturgas Pipeline GmbH & Co. KG (TENP KG), the owner of the gas transmission system. The TENP KG shareholders are Open Grid Europe GmbH (51 %) and Fluxys TENP GmbH (49 %).

* for the European energy infrastructure (TEN-E Regulation). EU Regulation 347/2013 defines the planning requirements for Projects of Common Interest (PCI). The Regulation aims to fill existing gaps in the European energy network infrastructure through a common effort and ensure that the necessary projects can be implemented based on a planning concept that conforms to European law  (BNetzA 2016). According to the publicly available list issued by the Federal Network Agency


There will be a public information meeting in the ‘Bürgersaal’ in Hügelheim / Müllheim on 17 January 2017.