According to Hydrogen Fuel News, the 18-month demonstration project will deploy two Samskip SeaShuttle container vessels on a dedicated corridor connecting Rotterdam and the Oslofjord. The power plant architecture relies on 6.4 MW of Ballard FCwave fuel cell systems operating in conjunction with onboard cryogenic storage and shore-side bunkering infrastructure. While the source does not disclose whether the 6.4 MW rating represents aggregate power across both vessels or the installed capacity per hull, the figure establishes an important scale milestone for maritime heavy-duty propulsion and upstream fuel planning.

Fuel Cell Demand and Cryogenic Mass Flow

For plant engineers sizing maritime supply chains, a 6.4 MW proton-exchange membrane (PEM) fuel cell plant provides a concrete basis for calculating cryogenic hydrogen throughput. Assuming typical nominal PEM electrical efficiencies between 50% and 55% based on the lower heating value (LHV) of hydrogen (approximately 33.3 kWh/kg), continuous operation at full load requires approximately 350 to 385 kg of hydrogen per hour. Over an extended coastal transit, fuel consumption quickly scales into multi-ton quantities.

Liquid hydrogen offers a density of approximately 71 kg/m³ at near-ambient pressure and 20 K, which significantly reduces onboard tank footprint compared to 350-bar or 700-bar compressed storage. However, incorporating cryogenic storage into a marine vessel introduces critical engineering constraints:

• Boil-Off Gas (BOG) Management: Standstill and dynamic heat ingress generate boil-off that must be reliquefied, safely vented, or routed to balance-of-plant systems such as auxiliary hotel-load fuel cells to prevent tank overpressurization.
• Dynamic Flow Conditioning: Liquid hydrogen must be heated, vaporized, and pressure-regulated before introduction into the Ballard FCwave fuel cell stacks, requiring integrated heat exchangers tied to fuel cell coolant loops.
• Shore-to-Ship Transfer: Liquid bunkering demands vacuum-insulated transfer lines, specialized dry-break couplings, and nitrogen-purged transfer sequences to avoid air ingress and freezing during shore-side operations.

Implications for Upstream Infrastructure and Offtake

From an offtake perspective, regular liner services between Rotterdam and the Oslofjord provide the steady, baseload demand profile that hydrogen production assets require. A single vessel burning several tons per round trip can absorb the daily output of a mid-scale production plant, dramatically improving project bankability compared to intermittent distributed transport fleets.

For project developers sizing the upstream production footprint, each kilogram of liquid hydrogen carries specific facility-level implications:

• Electrolyser Sizing: Supplying several tons of fuel per week requires multi-megawatt electrolysers operating under high capacity factors. Water electrolysis typically demands roughly 50 to 55 kWh of electricity per kilogram of hydrogen produced.
• Water Treatment Duty: Stoichiometric water splitting requires roughly 9 kg of pure water per kilogram of hydrogen, which translates into approximately 10 to 11 kg of demineralized feed water per kilogram once blowdown and purification losses are included.
• Liquefaction Energy Penalty: Unlike compressed gas projects, liquid hydrogen bunkering introduces a liquefaction stage that historically consumes between 8 and 12 kWh of electrical energy per kilogram of hydrogen. Developers must factor this parasitic electrical load into their landed cost per kilogram and local grid connection limits.

The HyShip trial will provide project developers with rare operational data on how cryogenic transfer losses, dynamic maritime fuel cell loading, and bunkering turnaround times impact real-world project economics across a key European industrial shipping lane.

Source

This analysis was written from reporting by Hydrogen Fuel News: HyShip pushes hydrogen infrastructure with SeaShuttle vessels, published 01 October 2026. Figures and events above are as reported there; the engineering commentary is ours.