First Hydrogen Charging Trial: Floating Platform Delivers 300 kW
UK energy equipment provider GeoPura recently completed a technical demonstration at the Port of Tilbury on the Thames, deploying a hydrogen power unit (HPU) on a floating platform to charge a commercial electric vessel. The system, utilizing five fuel cells produced by Canada’s Ballard, converted hydrogen into electricity with an output of 300 kW. This marks the first practical application of hydrogen technology for vessel charging at a port, showcasing its feasibility as a temporary power source.
GeoPura stated that the trial aimed to validate hydrogen’s potential in port power supply. Ports often face instantaneous high-power demands when vessels dock, with local grids struggling to meet loads ranging from several hundred kilowatts to several megawatts. Hydrogen power units can provide the required electricity on-site, avoiding the lengthy wait and high costs associated with grid upgrades.
Efficiency Bottleneck: Hydrogen Conversion at Just 32%
While the hydrogen charging technology succeeded in the Port of Tilbury trial, its overall efficiency has become a focal point of concern. According to data provided by GeoPura, for every 3.1 MWh of electricity used in hydrogen production, only about 1 MWh of usable electricity is generated after fuel cell conversion, resulting in an efficiency of approximately 32%. This means nearly 70% of the energy is lost during the conversion process, significantly lower than the efficiency of direct grid or battery-storage charging.
In contrast, battery-storage systems typically achieve charge-discharge efficiencies of over 80% and involve relatively lower infrastructure costs. If ports adopt battery-storage solutions, they can charge during off-peak grid periods and release high-power electricity when vessels dock, effectively balancing grid load. Additionally, some ports have begun using swappable battery containers to further enhance charging efficiency and vessel turnaround speed.
Differing Application Scenarios for Hydrogen and Battery Storage
GeoPura emphasizes that hydrogen power units still hold advantages in specific scenarios. The company has already deployed this technology at temporary construction sites, large-scale events, and remote areas lacking grid coverage, replacing traditional diesel generators to provide zero-emission power. These environments often have unstable power demands and are sensitive to noise and air pollution, making hydrogen power units a flexible and environmentally friendly solution.
However, port charging demands differ from these scenarios. Ports typically have basic grid connections, and vessel charging follows predictable patterns, making large-scale battery-storage systems more suitable. While hydrogen solutions can address instantaneous high-power demands, they require additional infrastructure for hydrogen production, storage, and fuel cells, increasing overall costs and complexity compared to battery-storage systems. Furthermore, hydrogen’s low energy conversion efficiency may pose long-term operational cost challenges to its adoption.
Commercial Viability Yet to Be Proven
The hydrogen charging trial at the Port of Tilbury introduces new possibilities for port power supply, but its commercial viability requires further real-world data. Industry analysis suggests that the development of electric vessel charging infrastructure will depend on repeated deployments, high utilization rates, and reasonable electricity pricing mechanisms. Upgrades to the grid, substations, charging piles, and battery-storage systems can not only serve vessels but also support electric trucks, handling equipment, and building power within ports, offering greater overall benefits.
Currently, hydrogen charging systems in port applications still face challenges such as low efficiency, high costs, and complex infrastructure. While this trial demonstrated technical feasibility, whether hydrogen can outperform battery-storage solutions in cost, efficiency, and reliability remains to be validated by more real-world data from additional ports. Moving forward, the charging models for electric vessels will prioritize operational efficiency and cost control over purely technological breakthroughs.
