Windbostel Ost is a planned 2.0 GW offshore wind farm in the German North Sea, located on BSH plot N-9.1 roughly 100–115 km northwest of Borkum. The project is being developed by a joint-venture between RWE and TotalEnergies (50/50) and sits in deepwater (reported minimum water depths ~40–42.5 m)...
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BSH public notice states the online consultation (Online-Konsultation) for the Windbostel Ost plan approval procedure will take place from Friday 10.04.2026 00:00 to Thursday 23.04.2026 24:00 (following cancellation of earlier 20.03.2026 dates).
As part of the Windbostel Ost plan approval procedure, BSH made the project’s plan documents publicly available on its Application and Participation Portal from 15 December 2025 to 14 January 2026, allowing stakeholders to review the plans and submit objections up to 16 February 2026.
The Federal Maritime and Hydrographic Agency (BSH) announced that it had received an application from Windbostel Ost GmbH to initiate the plan approval (Planfeststellungsverfahren) under the Offshore Wind Energy Act (WindSeeG) for the construction and operation of the Windbostel Ost offshore wind farm in the German North Sea Exclusive Economic Zone.
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Windbostel Ost GmbH, Offshore Wind Four GmbH, Offshore Wind Four (N-9.1), RWE N-9.1, N-9.1
On 23 June 2025, Fugro announced that it had been awarded contracts to carry out integrated site characterisation for RWE and TotalEnergies’ Windbostel Ost offshore wind project in the German North Sea, as part of a joint award also covering Windbostel West. Under these contracts Fugro will conduct both geophysical and geotechnical site investigations northwest of the island of Borkum, generating detailed Geo-data on seabed and subsurface conditions. The geophysical surveys will map the seabed and shallow subsurface layers and identify potential hazards, while the geotechnical investigations will collect and test soil samples in situ. The resulting combined dataset will support early design decisions for Windbostel Ost, including foundation design, structural analysis, cable routing and risk assessment for later construction and operational phases.
RWE and TotalEnergies formed a 50/50 joint venture to co-develop the 4 GW Windbostel offshore wind projects, including the 2 GW Windbostel Ost wind farm at site N-9.1 in the German North Sea, with each partner holding a 50% stake in the project company.
In late 2024, TotalEnergies acquired a 50% equity stake in the Windbostel Ost and Windbostel West offshore wind projects from RWE, creating a 50/50 ownership structure for the 2 GW Windbostel Ost wind farm and its sister project.
In August 2024, RWE secured the development rights for the 2 GW offshore wind site N-9.1 in the German North Sea—now being developed as Windbostel Ost—through a German offshore wind auction, as part of a 4 GW award that also included the neighbouring N-9.2 site.
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