Demolition makes room for DC substation


After TransnetBW, the transmission system operator (TSO) from the south-western German state of Baden-Württemberg, was granted building permit for the ULTRANET substation on the site of the former Philippsburg nuclear power plant in March 2020, the way is now finally clear for its construction. At 6.05 in the morning of 14 May 2020, the two cooling towers on the site of the former power plant were detonated. Now the necessary construction space of around 100,000m² is created. The Philippsburg plant was shut down completely on 31 December 2019 and the building construction of the ULTRANET substation is scheduled to start in the third quarter of 2020.

Since the future Philippsburg substation is the southern end point of the supra-regional high-voltage direct current (HVDC) line ULTRANET, it will be one of the most important energy hubs in Germany’s soon-to-be energy landscape. ULTRANET, a European Project of Common Interest (PCI), is jointly implemented by the two TSCNET shareholders TransnetBW and Amprion. It will transfer wind energy generated in the northwest of Germany to the more industrially developed southwest with low losses. In Philippsburg, the transmitted DC will be converted into AC and distributed regionally. In the reverse case, the substation enables the conversion of AC to DC, e.g. to transport excess photovoltaic power from the south to the north.

The fact that the “green” substation will feed renewable electricity into the transmission system instead of nuclear power is a representative of the entire German energy future. “The construction of our DC substation on the site of the cooling towers of the nuclear power plant is a visible sign and symbol of the progress of the energy transition,” comments Dr. Werner Götz, Chairman of the TransnetBW Executive Board. “In future, renewable electricity will flow from the Philippsburg site through the TransnetBW transmission grid to the entire region. Thus, as the TSO in Baden-Württemberg, we ensure that our country will have the electricity it needs even in a future without nuclear power and coal.”

With the cooling towers of the Philippsburg nuclear plant detonated, TransnetBW will begin construction of the ULTRANET substation (picture: screenshot taken from video “Sprengung der Kühltürme des Atomkraftwerks Philippsburg”, in German, YouTube channel of German newspaper “Die Rheinpfalz“)

> See TransnetBW press release, in German (html)