Dedication to offshore wind


Offshore wind energy generation is one means to reach international climate goals. ULSTEIN has been developing offshore wind designs since 2006. The designs draw on our broad experience in oil and gas, and range from new turbine installation concepts to foundation installation vessels and service operation vessels.

Film below: The 'Siem Moxie' at work. The active motion compensated gangway is transferring people directly onto the turbine's TP platform and the 3D motion compensated crane is lifting the Offshore Support Unit over to the turbine. The vessel has later been acquired by Subsea7 and has been renamed 'Seaway Moxie'.

Ulstein's offshore wind history

Ulstein’s entry into the offshore wind market started with a new installation concept for wind turbines, the F2F (Floating to Fixed) concept back in 2006. This was followed by our first designs for Service Operations Vessels (SOVs)/Installation Support Vessels (ISVs) and foundation installation vessels (FIVs). Our first two SOV/ISV deliveries were awarded the 'Offshore Renewables Award', in 2014 (Siem Moxie - now: Seaway Moxie) and 2017 (Windea La Cour). Our X-STERN® solution was awarded the Next Generation Ship Award in 2015.

Rock installation

Subsea rock installation (SRI) vessels are widely used in the offshore industry, stabilising and protecting subsea pipelines, cables and other structures at the sea bed. For the offshore wind industry, SRI vessels also lay protective coverings of rock around turbine foundations, to avoid scouring. Ulstein has a proven track record in developing these highly specialised vessels, the most recent reference being the highly innovative DP3 fall-pipe vessel ‘Bravenes’.

Seaway Moxie ISV operates as a duo

The ‘Seaway Moxie’, an ULSTEIN SX163 design delivered in 2014, is operated by Seaway Offshore Cables, a Subsea7 company. She often works as part of a duo, in which Seaway Moxie operates as an ISV, together with the cable laying vessel Seaway Aimery. The Seaway Moxie’s key features are a 3D motion-compensated telescopic crane and an active motion compensated personnel transfer gangway, permitting the safe transfer of work crews in significant wave heights up to 3.0 m. Thanks to the ship’s active roll stabilization capabilities, offshore works can continue even in challenging sea and wind conditions.

SX175 designs for BS Offshore
Two SOV vessels were then developed for BS Offshore (Bernhard Schulte), introducing the novel X-STERN feature. The vessels are servicing offshore wind farms on contract for Siemens. The ‘Windea La Cour’, delivered in July 2016, is operating in the Gemini Offshore Wind Park offshore the Netherlands. The ‘Windea Leibniz’, delivered on 28 February 2017, is working in the two Vattenfall offshore wind installations, Sandbank and DanTysk offshore Germany. The two vessels have an active motion-compensated ‘Walk to Work’ (W2W) gangway, which is used for the safe transfer of maintenance teams to and from the individual turbine foundations in significant wave heights of up to 2.5 m or more. Bernhard Schulte has ordered a third SOV vessel of the larger SX195 design for delivery from Ulstein Verft in 2020.

SX195 for Acta Marine
An SX195 Construction Support Vessel, the Acta Auriga, was contracted by Acta Marine and delivered in March 2018. The SMST motion compensated gangway has integrated elevator and crane functionality. The vessel can perform 3D compensated lifts with its 6t 3D crane, and has accommodation for 120 people. The vessel has been contracted for Operations and Maintenance work at the BARD Offshore 1 offshore wind farm. A vessel number two, Acta Centaurus, has been contracted for delivery from Ulstein Verft in 2019.

ULSTEIN has the resources and competence to perform all tasks in a newbuild project, from the initial idea arises, to design, engineering and further on to ship construction, installation, commissioning, testing and delivery.