Explore our portfolio of Construction Service and Service Operation Vessel designs.
Ulstein’s service operation vessels (SOVs and CSOVs) are purpose-built to support the full lifecycle of offshore wind farms and energy infrastructure. Whether it’s wind farm maintenance, cable installation support, or safe and efficient crew transfer, our vessels are engineered to deliver reliable performance in demanding marine environments.
Operators benefit from reduced fuel consumption, enhanced operability, and improved safety—especially in harsh weather conditions. Our designs prioritise crew comfort, operational uptime, and environmental responsibility.
Key innovations include the patented X-BOW® and TWIN X-STERN® hull forms, which reduce slamming and improve seakeeping, as well as hybrid propulsion systems that lower emissions and fuel costs. Our vessels are available with either DP2 or DP3 dynamic positioning systems, depending on the configuration, to ensure precise station-keeping during walk-to-work operations.
Cutting-edge solutions that optimise vessel performance and enhance operational efficiency.
Turning visions into realities motivates us to keep pushing for progress in the maritime industry.
You can learn more about how we work with our customers to achieve their visions through our stories.
With the delivery of Douglas Mawson on 9 September 2025, the seventh vessel in the Infinity class for SunStone Ships, the proven ULSTEIN CX103 platform continues to demonstrate its strength. Built at the CMHI shipyard and chartered to Aurora Expeditions, the vessel is now ready to explore polar regions, remote coastlines, and global destinations.
5 September 2025 – Bernhard Schulte Offshore (BS Offshore) has taken delivery of its latest state-of-the-art Commissioning Service Operation Vessel (CSOV), WINDEA Clausius, yard number 321, from Ulstein Verft.
The Norwegian government has announced its decision to purchase British frigates. Ulstein has collaborated with the Germany-based TKMS in an effort to secure the contracts.
Yinson GreenTech’s business unit marinEV, which delivers maritime electrification solutions in Singapore, has entered into a partnership with Blue Ctrl AS, a Norwegian software provider specialising in maritime systems. The collaboration will introduce Blue Ctrl’s X-CONNECT platform to the maritime market in Singapore.
On Friday 15 August 2025, the hull for a new offshore wind service vessel of the CSOV type arrived at Ulstein Verft. This marks a new step in the process towards the completion of this state-of-the-art vessel, which has been developed to support energy-efficient offshore wind operations with high performance.
Ulstein Verft has signed a contract with Olympic to retrofit the Olympic Notos for operations supporting unmanned installations on the Norwegian Continental Shelf. This project will provide extensive work for Ulstein.
Van Oord and Ulstein collaborate on a powerful newbuild set to enhance offshore installation capabilities.
The sea trial of the expedition cruise vessel, Douglas Mawson, was successfully completed on 2 July 2025. This significant milestone marks a step closer to the vessel's delivery in autumn 2025. The vessel was contracted by SunStone Ships and will be operated by Aurora Expeditions.
The hull of the state-of-the-art DP3 cable-laying vessel Nexans Electra arrived at Ulstein Verft on 5 July 2025. This marks the commencement of the outfitting and completion phase of the vessel. Upon completion in 2026, she will feature a split turntable on deck capable of holding up to 10,000 tonnes of cable, an under-deck turntable with a 3,500-tonne cable capacity, and a fibre optic tank with a 450-tonne capacity.
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