26 June 2025 – Bernhard Schulte Offshore (BSO) has taken delivery of the state-of-the-art, commissioning service operation vessel (CSOV) WINDEA Curie, yard number 320 from Ulstein Verft. 

The total number of walk-to-work (w2w) vessel designs and redesigns by Ulstein now count 22, of which 14 are currently in operation. In average, these vessels perform repair and maintenance on more than 5,000 turbines – every year! 
That makes a stunning 95,000+ gangway connections!

Olympic's latest CSOV, the 'Olympic Notos', has been operational for six months since her delivery, and the feedback is outstanding.

On 11 March 2025, the hull of yard number (Yno) 321 for BS Offshore arrived at Ulstein Verft. This marks the beginning of a new phase in the shipbuilding process. The vessel is designed by Ulstein Design & Solutions AS for ‘walk-to-work’ (W2W) operations, where personnel walks via a motion-compensated gangway from the ship to a wind turbine.

BS Offshore and Ulstein Verft has passed a significant milestone with the launch of the Yno 320, a state-of-the-art Commissioning Service Operation Vessel (CSOV). 

Penta-Ocean Construction, a prominent Japanese general contractor, has commissioned Ulstein Design & Solutions B.V. to design its new heavy lift vessel for offshore wind foundation installation. The customised ULSTEIN HX118 design will feature a 5,000-ton Huisman main crane and the ULSTEIN U-STERN™, which enables the installation of increasingly larger monopile foundations.

Four state-of-the-art TWIN X-STERN CSOV vessels for Acta Marine, are currently in various phases of construction at the Tersan Shipyard, Türkiye. The vessels are designed by Ulstein Design & Solutions AS. 

On 19 December 2024, the CRIST shipyard, Poland, carried out the keel laying ceremony for an ULSTEIN SX222 designed vessel, which will be Ulstein Verft's yard number 323, built for institutional investors.

The hull of the first TWIN X-STERN Commissioning Service Operation Vessel (CSOV) for BS Offshore arrived Ulstein Verft on 18 December 2024. This milestone marks the start-up of the outfitting for Yard Number 320 at Ulstein Verft. 

Taking bold commercial risks on novel vessel concepts with a strong focus on sustainability has made Olympic a pioneering player in the offshore energy sector. Its latest investment in a pair of new-build Construction Service Operation Vessels (CSOVs) based on Ulstein Group’s innovative TWIN X-STERN® solution has paid off, with close to 50% reductions in fuel consumption and emissions to boost environmental performance.

On 1 October 2024, the steel cutting ceremony for Ulstein Verft’s yard number 323 was held at the Crist hull yard. The Commissioning Service Operation Vessel (CSOV) is based on the award-winning TWIN X-STERN platform and has been designed by Ulstein Design & Solutions AS.

On Wednesday, 21 August 2024, one month after the delivery of the Olympic Boreas, Ulstein Verft launched the second Construction Service Operation Vessel (CSOV) for Olympic; the Olympic Notos. Both vessels are built on the innovative TWIN X-STERN solution, a concept described as a '4-wheel-drive' for the seas.

On Friday, 16 August 2024, Shanghai Electric celebrated the combined naming and delivery of two Service Operation Vessels (SOVs) at ZPMC, Qidong base, China. The vessels are based on two different ship designs from Ulstein Design & Solutions AS and are the first purpose-designed vessels for the offshore wind industry in China.

The keel laying ceremony at Crist hull yard 06 August 2024 symbolizes that yard number 322 is one step closer to realization. The CSOV vessel, based on a TWIN X-STERN platform designed by Ulstein Design & Solutions AS, will be capable of performing a vast range of operations, including Operation & Maintenance and construction support.

As offshore wind farms grow in size and number of turbines, the demand for the capacity of existing inter-array cable laying vessels (CLVs) intensifies. The next-generation CLV must be capable, cost-effective, and able to serve more and larger turbines.