Ulstein and Tersan collaborate on Acta Marine’s methanol-fueled offshore wind vessels

Ulstein Design & Solutions AS has entered into a contract with Tersan Shipyard for the construction of two methanol-powered ULSTEIN SX216 Construction Service Operating Vessels (CSOVs).

These innovative vessels, featuring the TWIN X-STERN solution, will be part of the Acta Marine fleet, supporting North Sea wind farms. With the aim of improving operability and reducing emissions, the TWIN X-STERN design incorporates two sterns and two main propeller units, ensuring excellent maneuverability in challenging weather conditions. The vessels are set to commence operations in the Port of Grimsby by early 2025 and 2026.

TWIN X-STERN design

The TWIN X-STERN design, with its bi-symmetric hull shape and flexible propulsion options, allows for enhanced fuel efficiency and reduced motions. Technicians working on offshore wind farms will benefit from improved rest quality, enabling safer operations. The hybrid power solution of the CSOVs utilizes green methanol as the primary energy source, supported by dual-fuel engines and a battery package. This integration enables the most fuel-efficient modes of operation and contributes to the reduction of emissions during offshore wind farm operations.

The order for two additional Ulstein-designed SX216 SOVs reflects Acta Marine’s commitment to reducing its carbon footprint and aligns with their goal of a 70% reduction in net CO2 emissions.

Methanol-powered

Ulstein Design & Solutions worked closely with Acta Marine to evaluate the most suitable fuel alternatives, ultimately selecting methanol for its favorable energy density, storage properties, and market availability of dual-fuel engines. As a result, the design was adapted to incorporate methanol bunkering, tanks, and system layouts.

Offshore wind farms support

The ULSTEIN SX216 CSOV design, developed specifically for offshore wind service operations, offers key features to support the commissioning, operation, and maintenance of offshore wind farms. With a length of 89.9 meters, a beam of 19.2 meters, and a capacity for up to 135 personnel on board, the vessel includes a motion-compensated gangway for safe personnel transfer, a 3D-motion-compensated crane for cargo handling, and the capability to carry a daughter craft for in-farm transfers.

Image source: Acta Marine

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