The federal state of Schleswig-Holstein is the most northern part of the German control area of TSCNET shareholder TenneT, the Dutch-German transmission system operator (TSO). It is characterised by windy coastal regions and thus a significant wind energy production. Naturally, the northern state plays a key role in the national energy transition. Due to the high feed-in of green electricity, Schleswig-Holstein’s existing high-voltage grid has long been at the load limit. Hence, the construction of new extra-high voltage power lines for transporting the electricity to Germany’s southern and western consumption centres is indispensable and a policy aim.
One such new line is the so-called “Middle Axis” from Denmark to Hamburg, a replacement construction for the old and insufficient 220kV overhead line, that runs through central Schleswig-Holstein. The 380kV “Middle Axis” will be supplemented by coastal lines in the east and west (“East-Coast-Line” and “West-Coast-Line” respectively). On 23 January, the southern section of the line between the substations Hamburg/Nord and Audorf has been officially put into operation in the presence of Robert Habeck, Deputy Prime Minister of Schleswig-Holstein and Minister of Energy, Agriculture, the Environment, Nature, and Digitalisation. The new “Middle Axis” section has seven times the transmission capacity of the old line.
Mr. Habeck and Lex Hartman, member of the TenneT executive board, jointly pressed the symbolic button for commissioning the line section after three years of construction. The Deputy Prime Minister conceded during the ceremony, that “the grid extension is one of the most unpopular sides of the energy transition”, and therefore specifically recognised TenneT’s endeavours to involve the public early and adequately. Besides paying tribute to the benefits for the energy transition, Lex Hartman also mentioned the economic and operational value of the project for the TSO: “Already this first construction section of the ‘Middle Axis’ has caused a significant reduction of grid-stabilising measures and interventions in the conventional energy production in Schleswig-Holstein during its gradual technical commissioning since the end of December.”
> See TenneT press release, in German (html)
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