The HSI Joint Venture—comprising HSM Offshore Energy, Smulders, and Iv—has successfully and safely rolled out the topside for OSS Zingst at HSM Offshore Energy’s yard in Schiedam. The milestone advances the delivery of offshore wind transmission infrastructure for 50Hertz.

OSS Zingst is one of two offshore substations, together with OSS Darß, that form the OST-6-1 grid connection in the German Baltic Sea. With a combined transmission capacity of 927 MW, OST-6-1 will connect the Gennaker Offshore Wind Farm to the onshore grid.

The Zingst topside measures 48 m × 33 m × 17.5 m (L × W × H) and weighs 4,700 t. Once installed offshore, the substation will collect and transform 450 MW of power generated by the Gennaker wind farm before transmitting it to shore. The Schiedam roll-out marks a key project step and reflects coordinated progress within the HSI consortium as the work moves toward load-out, sail-away, and offshore installation.

Under the EPCIC contract, the HSI consortium is responsible for the engineering, procurement, construction, installation, and commissioning of the Ostwind3, Zingst, and Darß topsides and their jackets. The joint venture’s integrated execution is intended to support efficient coordination, technical consistency, and established safety and quality standards for a project of this scale.

Located in the German Baltic Sea, OST-6-1 is designed with a transmission capacity of 927 MW. Its two substations—Zingst and Darß—will connect the Gennaker Offshore Wind Farm to 50Hertz’s transmission grid, strengthening regional energy capacity and supporting climate targets in Northern Europe.