Ulstein Designs "Zero-Emission" Offshore Wind Turbine Installation Vessel

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Norwegian shipbuilding and design company Ulstein has launched the design for a "zero-emission" hydrogen-powered offshore wind turbine installation vessel.

"Ulstein's second hydrogen hybrid design for the offshore wind industry, the ULSTEIN J102 zero-emission wind turbine installation vessel (WTIV), can operate 75% of the time in zero-emission mode. Using readily available technology, the additional cost is limited to less than 5% of the total CAPEX," Ulstein said Friday.

"Most new jack-up designs are featuring a battery hybrid system in addition to diesel gen-sets, with a future option for hydrogen-powered fuel cell system. The downside however of a high-power battery energy storage system (BESS) is its heavyweight and cost. That is not beneficial for a WTIV design, where weight savings are essential for minimizing Elevated Weight and optimizing the Variable Deck Load," Ulstein said.

Rather than to opt for technology to be matured to perfection and make a design that is prepared for future hydrogen-powered fuel cells, Ulstein says it has taken the pragmatical, yet realistic approach. 

"‘We have carefully analyzed the operational cycle of WTIVs and looked at the power demand in the various modes of operations," says Ko Stroo, Product Manager at Ulstein. 

Stroo says that the analysis showed that around 75% of the time, a WTIV is in a jacked-up position performing crane operations. 

"Using a combination of a hydrogen fuel cell system and a relatively small battery energy storage system (BESS) is then sufficient to meet the overall power demand on board and crane peak loads," Stroo said.

"The same design philosophy as on our first hydrogen-powered SX190 design, resulted in a much more attractive business case when applied to a turbine installation vessel’, states Edwin van Leeuwen, managing director of Ulstein’s Rotterdam design office.

Ulstein said that its hydrogen hybrid system of the ULSTEIN J102 design has been developed in a way that future developments in hydrogen technology can easily be fitted into the vessel without major modifications. 

"The limited availability of hydrogen bunker infrastructure in ports is often seen as a major hurdle. With our modular storage lay-out, we want to break the chicken and egg dilemma," Stroo says. "It creates flexibility to operate the vessel worldwide, even when bunker infrastructure is not yet present."

"‘The strong focus on renewable energy and emission reduction to meet worldwide climate goals should also be reflected by investments in cleaner operations when installing offshore wind turbines’, says Edwin van Leeuwen. "Hydrogen is one of the most promising zero-emission fuels for offshore vessels and we want to be leading in developing sustainable ships."

ULSTEIN’s J102 hydrogen-hybrid zero-emission design specs, as shared by Ulstein:

CO2 reduction per year: 4,000 mt
Emission reduction per installation cycle: 25 %
H2 fuel cell system: PEM fuel cell
H2 storage system: 7 x 40ft containers compressed H2
Battery energy storage

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