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Recently, DNV GL identified the five most promising alternative fuels for shipping, with hydrogen as the ultimate zero-emission solution. The first complete hydrogen-fueled prospect has now been assembled by Ulstein Design & Solutions BV and Nedstack Fuel Cell Technology BV.

The ULSTEIN SX190 Zero Emission DP2 construction support vessel is Ulstein’s first hydrogen-powered offshore vessel, featuring a Nedstack fuel cell power system. The DP2 vessel can cater for a large variety of offshore support operations. Sea trials of a newbuild ULSTEIN SX190 Zero Emission could happen as soon as 2022.


This design uses proven and available technology, enabling clean shipping operations to reduce the environmental footprint of offshore projects. CO2, NOx and PM emissions are eliminated when using hydrogen fuel cells.

The maritime industry needs to align and be ambitious in bringing green solutions forward for a sustainable future. With this hydrogen-fueled vessel, we aim for future zero-emission operations of long endurance.

—Tore Ulstein, deputy CEO, Ulstein Group

With today’s technology, the ULSTEIN SX190 design is already capable to operate 4 days in zero-emission mode. However, with the rapid developments in hydrogen storage and fuel cell technologies, a future zero-emission endurance of up to two weeks is targeted. For extended missions and capabilities, the vessel can fall back on its more conventional diesel-electric system using low sulfur marine diesel oil.

The ULSTEIN SX190 Zero Emission design is based on Ulstein’s existing SX190 vessel platform and has a total installed power of 7.5 MW, of which 2 MW is generated by a fuel cell power system, typically Nedstack Proton Exchange Membrane (PEM) fuel cells, which are located in a separate, second engine room.

Nedstack fuel cell systems have already been built and proven in the multi-megawatt power ranges and have now been marinized to meet the requirements of the marine industry, including class requirements and supply chains.

Ulstein is constantly looking to improve marine operations and to reduce the environmental footprint of the vessels we deliver to the market. Implementing fuel cell technology in a workhorse like the SX190 CSV design is one of the steps we take to move the marine industry into a more sustainable future, in addition to our X-BOW hull shape, ULSTEIN ZED ‘get-in-and-leave-no-trace solution’ and plug-in hybrid solutions.

—Ko Stroo, product manager at Ulstein Design & Solutions BV

The PEM fuel cells used in the SX190 Zero Emission design are fueled by hydrogen from containerized pressure vessels, a well-proven and readily available technology. These hydrogen storage containers can be loaded and unloaded by normal container handling operations and equipment, thus eliminating the need for expensive bunkering infrastructure and providing worldwide operational flexibility.

The hydrogen containers can be refilled at hydrogen production sites, either from industry by-product hydrogen or green hydrogen from electrolysis, making the vessel globally employable.


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