50Hertz to start preliminary Ostwind 4 works at Vierow landfall and Stilow substation in October 2026

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Early works will prepare the future subsea-cable landfall and converter site while full construction remains subject to planning approval.

Three people in high-visibility clothing standing on a beach by the sea.

Preliminary construction works for Ostwind 4 are set to begin at the subsea-cable landfall east of the Port of Vierow and at the Stilow substation in October 2026. — Credit: Jan Pauls

50Hertz Transmission GmbH will begin preliminary construction works in October 2026 for the Ostwind 4 grid connection at the future subsea-cable landfall east of the Port of Vierow and at the Stilow substation. The works precede full construction, which remains subject to planning approval, and support the planned connection of TotalEnergies’ OstSee Energies offshore wind farm to the German transmission grid using 525 kV high-voltage direct current technology.

  • Preliminary works are scheduled to begin in October 2026 at the future Ostwind 4 subsea-cable landfall east of the Port of Vierow and at the Stilow substation.
  • The activities do not yet constitute the full start of construction, which remains pending planning approval.
  • Ostwind 4 is planned to use an approximately 110-kilometre subsea cable route and a four-kilometre onshore cable section between the landfall point and Stilow.
  • 50Hertz plans to implement a 525 kV high-voltage direct current transmission system in the German Baltic Sea for the first time through Ostwind 4.
  • When are the preliminary construction works for Ostwind 4 scheduled to begin?

    They are scheduled to begin in October 2026 at the future subsea-cable landfall east of the Port of Vierow and at the Stilow substation.

  • Do the October 2026 works mark the full start of Ostwind 4 construction?

    No. The works are preliminary, and the full start of construction remains pending planning approval.

  • How will Ostwind 4 connect the offshore wind farm to the German transmission grid?

    The project is planned to use an approximately 110-kilometre subsea cable route to the landfall point in Vierow followed by a four-kilometre onshore cable section to the Stilow substation, where direct current will be converted into alternating current and fed into the extra-high-voltage grid.

(PRESS RELEASE) BRÜNZOW, Mecklenburg-Western Pomerania, Germany, 2-Oct-2026 — /EuropaWire/ — 50Hertz Transmission GmbH is set to begin preliminary construction works in October 2026 for the Ostwind 4 grid connection, with activities starting at the future subsea-cable landfall east of the Port of Vierow and at the Stilow substation.

The planned grid connection is designed to bring electricity generated by offshore wind farms in the Baltic Sea into the German transmission grid onshore. At Stilow, the existing substation site will be expanded to accommodate a new converter station.

These activities do not yet mark the full start of construction, which remains pending planning approval.

Further information on the construction activities for the Ostwind 4 grid connection system is available in the Ostwind 4 construction flyer.

About the project

Ostwind 4 will provide a grid connection for the offshore wind farm “OstSee Energies”, planned by TotalEnergies northeast of Rügen, to the German transmission grid. The grid connection will transmit electricity from the landfall point in Vierow to the Stilow substation, initially via an approximately 110-kilometre-long subsea cable route before subsequently passing through a four-kilometre-long onshore cable section. Upon arrival at the Stilow substation in Brünzow (located in the Vorpommern-Greifswald district), the transmitted direct current (DC) will be converted into alternating current (AC) and fed into the extra-high-voltage transmission grid. For Ostwind 4 to do so, the Stilow substation site will be expanded to house an installed converter station as part of the project. With Ostwind 4, 50Hertz will implement a 525 kV high-voltage direct current (HVDC) transmission system in the German Baltic Sea for the first time.

SOURCE: 50Hertz Transmission GmbH

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