Local Hydrogen Production Crucial for Heavy-Duty Vehicle Emissions

The transition to hydrogen as a fuel for heavy-duty vehicles could drastically cut carbon dioxide emissions from the transport sector, according to new findings from Chalmers University of Technology in Sweden. The research emphasizes that locally produced green hydrogen stands out as the most effective option for enhancing climate benefits, while also promoting energy independence for nations, particularly during crises.

Heavy-duty vehicles currently account for one fifth of global oil consumption. In the European Union, heavy-duty diesel trucks represent the largest source of transport-related greenhouse gas emissions. With road transport demand projected to grow, the need to find sustainable alternatives to fossil fuels becomes increasingly urgent. The Chalmers study, published in the journal iScience, explores hydrogen’s potential as a cleaner fuel, covering aspects from production and distribution to the materials used in truck manufacturing.

Jorge Enrique Velandia Vargas, the study’s lead author and former postdoctoral researcher at Chalmers, highlights the importance of evaluating the entire lifecycle of hydrogen production and usage. “Hydrogen does not produce carbon dioxide when used in fuel cells, but we need to ensure that we do not shift emissions from one part of the lifecycle to another,” Vargas explains. The study assesses various scenarios for hydrogen supply chains in Sweden, revealing that hydrogen fuel significantly reduces emissions when compared to diesel.

The findings align with the European Union’s climate objectives, particularly under the Alternative Fuels Infrastructure Regulation (AFIR), which is part of the EU’s broader ‘Fit for 55’ climate package. This legislative initiative aims to reduce the EU’s greenhouse gas emissions by at least 55 percent by 2030, relative to 1990 levels, paving the way for climate neutrality by 2050.

One critical aspect of the research is the comparison between blue and green hydrogen. Blue hydrogen, produced from natural gas with carbon capture and storage, was found to have a potentially higher climate impact than green hydrogen, which is derived from water using renewable electricity. Maria Grahn, an Associate Professor at Chalmers, points out that while blue hydrogen may be deemed climate neutral theoretically, practical realities reveal that 5 to 10 percent of carbon dioxide can escape during production.

The study also explored the role of biomethane, a renewable gas generated from organic waste, as a possible alternative to natural gas in hydrogen production. This method has the potential to create negative emissions. However, researchers caution that the necessary infrastructure for carbon capture and storage is still required, and using biomethane directly as fuel in trucks may be more efficient.

The advantages of green hydrogen are clear: it is produced using water and renewable energy sources, resulting in minimal carbon emissions during both production and use. Vargas notes that hydrogen offers a unique opportunity for energy self-sufficiency globally, especially highlighted by the ongoing geopolitical tensions stemming from Russia’s war in Ukraine. “Hydrogen can be produced anywhere in the world using water and energy from the sun or wind,” Vargas states.

The research underscores the importance of local hydrogen production, indicating that generating hydrogen near refuelling stations is more beneficial than relying on large-scale central production facilities. This localized approach minimizes the energy loss and emissions associated with transporting hydrogen over long distances. “Hydrogen is the lightest of all the elements and does not ‘like’ to be transported,” Vargas explains, emphasizing the complications involved in its transport, whether gaseous or liquid.

Overall, the study advocates for tailored conditions to maximize hydrogen’s contribution to emission reductions and to make efficient use of resources. Although the research is framed within the context of Sweden, its findings hold relevance for global applications, as the transport sector continues to evolve rapidly.

The study titled “Vehicle-oriented and Sweden-framed life cycle assessment: Hydrogen for long-haul trucks” serves as a critical resource for policymakers and stakeholders aiming to make informed decisions to combat climate change effectively.