Dutch maritime support provider Acta Marine has finalised a contract to build two next-generation, Methanol MDO/HVO powered DP2 Construction Service Operating Vessels (CSOVs) at the Tersan shipyard in Turkey.

The contract includes an option to deliver two more vessels in the series at a later stage.

The new 89m-long and 19m-wide vessels will be aimed at the offshore wind construction market.

Featuring Ulstein Design & Solutions’ SX-216 TWIN-X Stern design, the vessels will be able to accommodate up to 135 people in 85 cabins.

They will incorporate a Motion Compensated Gangway system provided by SMST, which will be installed on an integrated tower with height adjustment as well as personnel/cargo lift.

Furthermore, they will include an SMST 3D-motion compensated crane with a lifting capacity of six tonnes.

The vessels will have outdoor and indoor cargo areas of 500m² each.

The CSOVs will be able to undertake projects during the commissioning and construction of offshore wind farms, as well as conduct maintenance works on completed wind farms.

Acta Marine managing director Rob Boer said: “The dedicated SX-216 design, with a TWIN-X stern, an integrated walk-to-work gangway system and 3D crane, and its hotel-style accommodation represents a next step in responding to the market needs.

“A first in offshore wind, this vessel will be capable of operating on dual-fuel methanol and MDO/HVO, enabling a strong carbon footprint reduction in the near future in combination with a battery power system.”

The first two CSOVs are planned to be delivered in the second and third quarters of 2024.