50Hertz selected HSI Joint Venture for engineering, procurement, construction, transport, installation, and commissioning of two offshore substations and jacket foundations for Gennaker offshore wind farm

Type: Supply Agreement · Technology: Offshore Wind · Country: Germany · Capacity: 927 MW · Announced: 2026-09-16

50Hertz selected the HSI Joint Venture in 2022 for the engineering, procurement, construction, transport, installation, and commissioning of two offshore substations and their jacket foundations. These substations, OSS Zingst and OSS Darß, are part of the OST-6-1 grid connection for Skyborn Renewables’ Gennaker offshore wind farm in Germany. The transmission system has a capacity of up to 927 MW and will transmit electricity from Gennaker in the Baltic Sea to the German grid. The substations will transform electricity generated by Gennaker to 220 kV before it is transmitted to the new Gnewitz substation onshore, approximately 70 to 90 kilometres away.

Analysis

On 16 September 2026 50Hertz announced a supply agreement with the HSI Joint Venture to engineer, procure, construct, transport, install and commission two offshore substations, OSS Zingst and OSS Darß, and their jacket foundations for the 927 MW Gennaker offshore wind farm in the Baltic Sea. The HSI Joint Venture includes HSM Offshore Energy and Smulders, the latter a Belgium‑based construction firm with over 2,400 employees operating in Belgium, the Netherlands, Poland and France. 50Hertz is the German transmission system operator responsible for the OST‑6‑1 grid connection that will deliver power from Gennaker to the onshore Gnewitz substation located 70–90 km away. The contract, selected in 2022, covers engineering through commissioning but does not disclose financial value. No additional timeline or financing structure was disclosed in the announcement.

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