Stadler and ARST (Trasporti Regionali della Sardegna) have presented what they describe as the world’s first narrow-gauge hydrogen train, marking a significant development in sustainable railway transportation. The unveiling took place on 19th June 2026 at the commissioning centre in Erlen, where the new Class SRHe 113 HMUs were officially introduced.

The vehicles are scheduled to begin carrying passengers from 2028 on routes operated by ARST, including Alghero Airport – Mamuntanas, Sassari – Alghero and Sassari – Sorso. With the introduction of the narrow-gauge hydrogen train, the two companies aim to advance a new phase of environmentally focused regional rail services in Sardinia. According to project estimates, the fleet of ten HMUs will reduce carbon emissions by more than 2,100 tonnes of CO₂ annually when compared with diesel-powered trains, an amount equivalent to approximately 450 car journeys around the world.

Renewable Hydrogen to Power Trains

A defining characteristic of the narrow-gauge hydrogen train is its propulsion technology, which combines fuel cells with hydrogen storage tanks. The system is installed within the central car, known as the Power Pack, where hydrogen is converted into electrical energy. This energy powers the train while simultaneously recharging its traction batteries. The hydrogen itself is produced using electricity generated entirely from solar power, ensuring the trains operate on sustainable hydrogen. As a result, the project establishes a fully integrated zero-emission solution for narrow-gauge railway operations, covering the entire chain from renewable energy generation through to train propulsion.

“These vehicles, developed in collaboration with Stadler, are a central element of the decarbonisation strategy for the narrow-gauge network. It is the first step in ARST’s evolution from a transport operator to an energy company capable of powering its own network of services. As already demonstrated by the active construction sites in Mandas, Alghero and Macomer, we are integrating technological innovation in vehicles with the autonomous production of clean energy. Working in full synergy with regional institutions, ARST is bringing to fruition a model of sustainable and fully self-sufficient public transport,” said Carlo Poledrini, Central Director of ARST.

Design to Facilitate Narrow-gauge Operations

Before entering commercial service, the Class SRHe units will undergo extensive testing to satisfy the requirements established by Italy’s National Agency for the Safety of Railways and Road and Motorway Infrastructure (ANSFISA).

The design of the new trains has been tailored to the unique operational requirements of Italy’s narrow-gauge railways. Because these networks can only accommodate vehicles with a particularly low axle-load, Stadler developed the units using lightweight materials and a specially adapted profile. The trains are equipped with air-conditioned interiors designed to provide a bright and comfortable environment, complemented by large panoramic windows.

Accessibility has also been incorporated through low-floor entry systems that facilitate boarding for passengers with reduced mobility. Compared with conventional diesel trains, the new units generate less vibration and operate more quietly, improving overall travel comfort. Dedicated crew facilities have also been included, featuring a separate access door and an independent air-conditioning system.

Italy’s Efforts Towards Sustainable Rail Transport

The project stems from the Framework Agreement signed by ARST and Stadler in 2023, which provides for the delivery of ten vehicles for regional and local transport services in Sardinia. The initiative forms part of a broader programme promoted by the Italian government and the Ministry of Infrastructure and Transport to decarbonise rail transport across Italy.

Through the deployment of the narrow-gauge hydrogen train, the programme seeks to introduce hydrogen technology to narrow-gauge routes and support the development of a new generation of sustainable rail vehicles. Beyond Sardinia, Stadler is also supplying hydrogen-powered trains to other Italian operators. Nine units are currently under construction for Ferrovie della Calabria (FdC), while two additional trains are being produced for Ferrovia Circumetnea (FCE) in Sicily. All of the vehicles are being manufactured at Bussnang.

The report, titled ‘Enabling Nuclear-Powered Feeder Ships: A Joint Development Project on Port Call Feasibility and Regulatory Pathways’, advocates for the inclusion of maritime nuclear propulsion in broader discussions concerning shipping decarbonization, energy resilience, and long-term industrial competitiveness. By using the Port of Rotterdam as a case study, the project aimed to understand how novel energy and shipping technologies might integrate with established port safety frameworks, operational procedures, and regulatory processes.

“Ports need to understand how emerging energy and shipping technologies may interact with future port operations and industrial systems,” said René de Vries, Harbour Master of the Port of Rotterdam.

“This study represents an initial case-study assessment intended to better understand the regulatory, operational and safety considerations associated with nuclear-powered commercial shipping within a European port context,” he added.

The findings indicate that the established risk-based safety frameworks, already familiar to European ports, could serve as a credible structure. This is contingent upon the systematic incorporation of nuclear-specific safety, security, and operational aspects, supported by relevant national and international guidelines. The study highlights that the primary hurdles for future maritime nuclear propulsion are likely to revolve around aligning regulations, establishing governance, integrating nuclear and maritime safety regimes, and ensuring public and institutional readiness. For instance, existing International Maritime Organization (IMO) regulations for nuclear-powered ships, originating from an earlier period, would require updating to support any future pathway for civilian commercial nuclear propulsion.

Ole Graa Jakobsen, Head of Fleet Technology at A.P. Moller – Maersk, said, “Shipping’s long-term energy transition will require the consideration of multiple fuel and technology pathways. Civil commercial nuclear propulsion presents a number of significant challenges, including safety, waste management, regulatory alignment and public acceptance across regions.”

“This study does not represent a decision to pursue nuclear propulsion, but contributes to further understanding of what would be required for ports and authorities to assess such vessels in a structured and responsible way. We continue to monitor and assess this technology alongside other low-emission solutions,” he added.

Besides being the world’s largest LNG-powered container ship, the CMA CGM Notre Dame is an impressive vessel, measuring 400 meters in length, 62 meters in width, and standing 75 meters high, with a substantial container capacity of 24,212 TEUs (Twenty-foot Equivalent Units). This new flagship vessel is deployed on the strategic French Asia Line (FAL), a critical service connecting Asia and Europe. The FAL route comprises a rotation of approximately 102 days, making port calls at major hubs including Ningbo, Shanghai, Yantian, Singapore, Le Havre, Rotterdam, Hamburg, and Tangier Med. This route is vital for the global supply chain, playing a pivotal role in provisioning European economies with essential goods.

Beyond its cutting-edge LNG propulsion system, the world’s largest LNG-powered container ship incorporates a suite of technologies designed to minimize its environmental impact. The vessel is equipped with an aerodynamic windshield system aimed at reducing energy consumption. A substantial 18,600 m³ LNG tank provides the necessary autonomy for its extensive Asia-Europe routes. Intelligent energy management solutions are integrated throughout the ship, particularly for powering and ventilating refrigerated containers, boasting a capacity for 1,600 reefer plugs. Furthermore, its architectural design has been optimized to enhance carrying capacity by an additional 280 containers without increasing the vessel’s overall dimensions, showcasing efficient space utilization.

The operational prowess of the CMA CGM Notre Dame is further amplified by its integration of advanced technologies and artificial intelligence (AI) solutions. Its fully digitalized bridge offers crews real-time navigation tools, augmented by sophisticated augmented reality systems. Advanced trajectory prediction capabilities and 360-degree visualization enhance maneuvering safety, especially during complex port operations. Embedded AI assists in optimizing voyage routes, dynamically adjusting vessel speed, and meticulously controlling energy consumption. These intelligent systems are continuously monitored and supported by CMA CGM’s global Fleet Centers located in Marseille, Miami, and Singapore, ensuring optimal fleet performance and aiding crews in critical operational decision-making.

CMA CGM Notre Dame, the world’s largest LNG-powered container ship, inaugurates a series of 10 ships, each named after emblematic French heritage landmarks, with deliveries scheduled between 2026 and 2028. These vessels will be progressively deployed across the world’s major maritime trade routes, continuing CMA CGM’s commitment to innovation and sustainability in global shipping.

The journey toward mainstream adoption of Sustainable Aviation Fuel represents a complex interplay of breakthrough technologies, evolving regulatory frameworks, economic considerations, and ambitious global commitments. From commercial production facilities in California to demonstration plants across Europe and Asia, the SAF ecosystem is expanding at an unprecedented pace, driven by collective determination from airlines, fuel producers, governments, and environmental stakeholders to fundamentally transform how the world flies.

Global Adoption Patterns of Sustainable Aviation Fuel

The landscape of Sustainable Aviation Fuel adoption reveals significant regional disparities shaped by policy frameworks, feedstock availability, and industrial capacity. Europe has positioned itself as the global leader through aggressive regulatory mandates, most notably the ReFuelEU Aviation regulation that came into force in January 2025. This landmark legislation requires aviation fuel suppliers to ensure that at least 2% of fuel supplied at European Union airports consists of SAF, with progressive increases to 6% by 2030 and an ambitious 70% by 2050. The regulation’s comprehensive approach addresses not only fuel suppliers but also establishes requirements for airports and aircraft operators, creating a coordinated ecosystem that prevents fuel tankering and ensures compliance across the value chain.​

North America follows a different but equally significant trajectory, leveraging market-based incentives rather than strict mandates. The United States Inflation Reduction Act has catalyzed substantial investment through the 45Z Clean Fuel Production Credit, offering SAF producers up to $1.75 per gallon in tax credits based on carbon intensity reductions. This financial support mechanism, combined with the Sustainable Aviation Fuel Grand Challenge announced in 2021, targets domestic consumption of 3 billion gallons by 2030 and 35 billion gallons by 2050. Major American airlines have signed long-term offtake agreements with SAF producers, demonstrating commercial commitment that extends beyond regulatory compliance.​

Global SAF blending mandates and targets across key regions demonstrate Europe’s early leadership with a 2% mandate in 2025, while Japan and Brazil have set ambitious 10% targets for 2030

The Asia-Pacific region represents an emerging frontier for Sustainable Aviation Fuel, with 2025 marking a pivotal transition from aspiration to action. Singapore has established itself as the regional pioneer with a confirmed near-term goal of 1% SAF by 2026, potentially rising to 3-5% by 2030. India’s government has set blending targets of 1% by 2027, 2% by 2028, and 5% by 2030 for international flights, recognizing the country’s significant potential for SAF production given its agricultural powerhouse status with over 750 million tonnes of biomass annually. China has achieved initial SAF production outputs with a government target of 50,000 tonnes by 2025, while Japan pursues an ambitious 10% mandate by 2030 supported by government subsidies. This regional diversity in policy approaches reflects varying stages of industrial maturity, feedstock availability, and aviation market dynamics across the Asia-Pacific landscape.​

Breakthrough Technologies Shaping SAF Production

The technological foundation of Sustainable Aviation Fuel production rests on multiple certified pathways, each offering distinct advantages in terms of feedstock flexibility, scalability potential, and carbon intensity. Currently, eight different technology platforms have received ASTM certification for commercial aviation use, with continuous advancement expanding the possibilities for sustainable fuel production.​

Hydroprocessed Esters and Fatty Acids represents the most mature and widely deployed SAF production pathway, accounting for the majority of current commercial output. The HEFA process converts triglyceride-based feedstocks such as used cooking oil, waste animal fats, and plant oils through hydroprocessing to break apart long chains of fatty acids, followed by hydroisomerization and hydrocracking. However, HEFA faces inherent scalability constraints due to limited availability of waste oils and fats, creating a ceiling on how much this pathway alone can contribute to meeting future SAF demand. Recent price spikes in vegetable oil feedstocks in 2022 highlighted the vulnerability of relying too heavily on oil-based sources, spurring industry interest in diversifying production technologies.​

Fischer-Tropsch synthesis offers transformative potential by enabling conversion of virtually any carbon-containing material into Sustainable Aviation Fuel. The FT process begins with gasification of feedstock, including municipal solid waste, agricultural and forest wastes, or energy crops to produce synthesis gas, which then undergoes catalytic conversion into liquid hydrocarbons.

The Alcohol-to-Jet pathway represents a particularly promising avenue for scaling Sustainable Aviation Fuel production due to the massive existing ethanol industry infrastructure. ATJ technology converts alcohols, primarily ethanol and isobutanol into jet fuel through dehydration, oligomerization, and hydrogenation processes. The strategic advantage of ATJ lies in feedstock abundance: ethanol yield per acre is six times higher than oils used in HEFA processes, and United States ethanol production operates at significantly larger volumes. The technology’s flexibility extends beyond conventional corn-based ethanol to include second-generation feedstocks such as agricultural residues and sugar bagasse, eliminating competition with food crops while expanding potential supply.

Power-to-Liquid technology represents the frontier of Sustainable Aviation Fuel production, offering theoretically unlimited scalability unconstrained by biomass availability. PtL, also known as e-SAF or synthetic fuel, combines captured carbon dioxide with green hydrogen produced from renewable electricity through Fischer-Tropsch synthesis to create liquid hydrocarbons. The transformative potential of this pathway lies in its emission reduction capability, up to 90% lifecycle greenhouse gas reductions compared to conventional jet fuel, and its ability to utilize abundant renewable energy resources While PtL currently faces cost challenges, remaining 2-3 times more expensive than conventional jet fuel due to high costs of renewable hydrogen and CO₂ feedstock, the pathway’s scalability advantages position it as essential for meeting long-term aviation decarbonization targets.​

Power-to-Liquid technology offers the highest lifecycle emission reduction potential at 90%, while established pathways like HEFA and Fischer-Tropsch deliver up to 80% reductions compared to conventional jet fuel

Environmental and Economic Impact of SAF Integration

The environmental benefits of Sustainable Aviation Fuel extend far beyond carbon dioxide reductions to encompass broader air quality improvements and ecosystem protection. Lifecycle analysis demonstrates that SAF can reduce greenhouse gas emissions by 75-90% compared to conventional jet fuel, depending on feedstock source and production pathway. This dramatic reduction stems from SAF’s closed-loop carbon cycle: the CO₂ released during combustion is offset by the carbon absorbed during the growth of biomass feedstocks, effectively recycling atmospheric carbon rather than introducing new fossil carbon. Beyond greenhouse gases, SAF delivers significant improvements in local air quality by reducing particulate emissions by up to 90% and virtually eliminating sulfur emissions, benefiting communities surrounding airports and along flight corridors. These non-CO₂ environmental benefits represent critical public health improvements that extend the value proposition of Sustainable Aviation Fuel beyond climate mitigation alone.​

The economic landscape surrounding Sustainable Aviation Fuel integration reveals both substantial challenges and transformative opportunities for the aviation industry and broader economy. The persistent cost premium of SAF, currently 2 to 3 times more expensive than conventional jet fuel for bio-based pathways, and up to 7 times more costly for synthetic Power-to-Liquid fuels, represents the most significant barrier to widespread adoption. This price disparity stems from multiple factors including advanced refining processes, feedstock procurement costs, and the early-stage nature of production infrastructure requiring substantial capital investment. Airlines operating on traditionally thin profit margins face difficult economic decisions when incorporating higher-cost sustainable fuel into operations, creating a chicken-and-egg dynamic where producers hesitate to scale production without guaranteed demand, while airlines struggle to commit to large-scale purchases at premium prices.​

However, the economic case for Sustainable Aviation Fuel transcends simple fuel cost comparisons to encompass broader value creation and risk mitigation. Domestic SAF production offers significant fuel security benefits by reducing dependence on volatile international petroleum markets and vulnerable supply chains. Economic modeling for New Zealand demonstrates that domestic production of 30% of jet fuel needs as SAF by 2050 could generate over $1.3 billion in Gross Value Added and create 5,700 jobs while enhancing energy independence. The global transition to SAF could create up to 14 million jobs, particularly benefiting developing nations with land suitable for sustainable feedstock cultivation but unviable for food crops. For tourism-dependent economies, SAF adoption represents insurance against revenue losses from environmentally conscious travelers choosing alternative transportation or destinations based on sustainability credentials.​

Global SAF production is experiencing exponential growth, from 15.84 million gallons in 2022 to a projected 3 billion gallons by 2030, representing a dramatic scaling required to meet aviation industry decarbonization goals

Government Policies and Incentives Driving SAF Growth

Government intervention through regulatory mandates, financial incentives, and research support has proven essential for catalyzing Sustainable Aviation Fuel market development. The European Union’s comprehensive approach through ReFuelEU Aviation establishes clear, escalating supply obligations that create market certainty for producers and investors. The regulation’s design addresses multiple market participants simultaneously: fuel suppliers must blend increasing percentages of SAF, airports must enable refueling infrastructure, and aircraft operators must uplift sufficient fuel to prevent tankering practices that could undermine environmental objectives. Penalties for non-compliance are substantial, calculated at least twice the yearly average price of conventional jet fuel multiplied by the quantity of SAF not uplifted, creating powerful economic incentives for adherence.​

The United States has pursued a complementary strategy emphasizing financial incentives and technological development support. The Inflation Reduction Act’s 45Z Clean Fuel Production Credit provides up to $1.75 per gallon for SAF production, with the credit multiplied by an emissions factor that rewards lower-carbon-intensity fuels. This market-based mechanism allows producers flexibility in pathway selection while incentivizing continuous improvement in carbon performance. The Department of Energy’s Bioenergy Technologies Office has deployed substantial funding for SAF projects, including $244.5 million specifically allocated for sustainable aviation fuel development and $46.5 million for low-emission aviation technology.

Asia-Pacific nations are rapidly developing policy frameworks tailored to regional circumstances and industrial capabilities. Australia’s September 2025 announcement of a A$1.1 billion Cleaner Fuels programme represents the first major government subsidy specifically targeting SAF in the region, with a ten-year funding commitment aimed at having production facilities operational by 2029. India’s forthcoming SAF policy, expected to be released soon according to November 2025 government statements, will address critical classification issues, reclassifying SAF from fossil fuels to bioenergy would unlock access to existing incentive schemes such as the Gobardhan programme for biomass utilization. Singapore’s passenger levy system to fund SAF adoption from 2026 demonstrates innovative financing mechanisms that distribute transition costs across the aviation ecosystem rather than concentrating burden on airlines alone.​

Challenges 

Despite remarkable progress and growing momentum, Sustainable Aviation Fuel faces formidable challenges that will determine the pace and scale of industry transformation. Feedstock availability and competition represent fundamental constraints, particularly for established pathways like HEFA that depend on limited supplies of waste oils and fats. As SAF production scales, competition for biomass resources will intensify not only within aviation but across multiple sectors pursuing decarbonization, renewable diesel, marine fuels, and industrial applications all compete for similar feedstock sources. The risk of unintended environmental consequences from feedstock sourcing, including potential land use changes that could negate carbon benefits, necessitates rigorous sustainability certification and transparent lifecycle accounting.​

Infrastructure development requirements extend far beyond production facilities to encompass storage, distribution, and airport refueling capabilities. Industry estimates suggest that global aviation infrastructure upgrades for SAF compatibility could exceed $150 billion over the next decade, creating a massive coordination challenge among airports, fuel suppliers, and airlines who must synchronize investments to avoid stranded assets. The geographic concentration of current SAF production, primarily in North America and Europe, creates supply-demand mismatches in rapidly growing Asia-Pacific aviation markets, highlighting the need for decentralized production facilities closer to consumption hubs. The classic infrastructure chicken-and-egg problem, where each stakeholder hesitates to invest without confidence in others’ commitments, represents perhaps a greater barrier than production technology itself.​

Conclusion

The future trajectory of Sustainable Aviation Fuel depends critically on maintaining policy support, securing adequate investment capital, and achieving global coordination on sustainability standards. Fragmented certification criteria across regions, where fuel qualifying as SAF in one jurisdiction may face stricter requirements elsewhere, creates market inefficiencies and competitive disadvantages for producers. The International Civil Aviation Organization’s Carbon Offsetting and Reduction Scheme for International Aviation provides a framework for global coordination, but effective implementation requires harmonization of lifecycle emission calculation methodologies and sustainability criteria. Industry projections suggest SAF could reach 10% of global aviation fuel by 2030 and 30% by 2040, with the International Energy Agency estimating SAF could account for 65% of aviation’s carbon reduction pathway to net-zero by 2050. Realizing these ambitious targets requires sustained commitment from all stakeholders, governments providing stable, long-term policy frameworks; airlines making binding purchase commitments; investors financing infrastructure at unprecedented scale; and technology providers continuing to innovate and reduce costs.​

The transformation of global aviation through Sustainable Aviation Fuel represents one of the defining infrastructure and technological challenges of the twenty-first century. Success will require unprecedented collaboration across industries, borders, and traditional competitive boundaries, united by recognition that sustainable flight is not merely an environmental imperative but an economic and social necessity for preserving aviation’s essential role in connecting humanity.

“We are proud to deliver the first fleet of hydrogen trains for Romania. With the Mireo Plus H, we combine a proven regional train platform with state‑of‑the‑art hydrogen technology, enabling zero‑emission rail operations on non‑electrified lines. Hydrogen will play a key role in achieving climate‑neutral mobility in Europe, and this project clearly demonstrates how innovation can be translated into reliable and economically attractive rail solutions,” said Andre Rodenbeck, CEO Rolling Stock at Siemens Mobility.

Hydrogen propulsion and energy efficiency

The Mireo Plus H features a hydrogen fuel cell-based electric propulsion system, complemented by battery energy storage. The batteries are charged either via the fuel cell system or through regenerative braking, enabling highly efficient energy use and zero local emissions during operation. Siemens Mobility has optimized the vehicle concept to significantly reduce weight, component complexity, energy consumption, and maintenance costs. All key onboard components have already been validated in previous Siemens Mobility projects, ensuring a high level of technical maturity and operational reliability.

Mireo Plus H – a modern regional train for Romania

The trains for Romania are based on the Siemens Mireo platform and configured as articulated two-unit trainsets with a maximum operating speed of 120 km/h. Each trainset offers 131 fixed seats plus 5 folding seats, providing a high level of passenger comfort while ensuring operational efficiency. The trains can be operated in multiple traction of up to two coupled units, offering flexibility for both current and future operational requirements.

Safety systems and passenger information

The vehicles will be equipped with PZB (intermittent train control) train protection systems and European Train Control System, ensuring compliance with European safety and interoperability standards. A modern Passenger Information System will provide continuous travel information through interior and exterior displays as well as automated announcements, enhancing the travel experience for passengers and supporting operational staff.

Comprehensive service scope and local presence

In addition to vehicle delivery, the contract includes a comprehensive full-service maintenance package with a duration of 15 years, extendable by another 15 years. Maintenance activities will be carried out locally in Romania, including at a dedicated depot in Bucharest, by Siemens Mobility personnel, supported by Railigent X digital maintenance and fleet management systems designed to optimize availability and extend component and battery lifetimes.

The scope delivers a fully integrated, end-to-end service solution, combining preventive and corrective maintenance, comprehensive overhauls, full Entity in Charge of Maintenance responsibility, and seamless material supply, ensuring optimal train availability and consistently smooth, reliable operations.

By replacing diesel-powered rolling stock, the new hydrogen trains will contribute to a significant reduction of emissions and noise in regional rail transport, supporting Romania’s long-term sustainability and climate objectives. The Mireo Plus H and the Mireo Plus B are part of Siemens Mobility’s successful Mireo platform, which comprises 24 fleets and nearly 600 trains. They stand for modern technology, high energy efficiency with savings of up to 25 percent, and the advantages of a standardized vehicle platform that enables synergies and economic benefits.

As prominent maritime stakeholders confidently commit to ambitious net-zero carbon targets by 2050, we are witnessing a complete paradigm shift in energy procurement and vessel engineering. The industry is rapidly abandoning its monolithic reliance on conventional marine fuels, pivoting instead toward a highly diversified, multi-fuel ecosystem. Recent technological breakthroughs highlight this rapid transition, proving unequivocally that cleaner, low-carbon maritime transport is no longer just a theoretical environmental goal, it is an impending commercial and operational reality. By examining the latest milestones across biomethanol, ethanol, and hydrogen applications, maritime professionals and corporate executives can gain a vital, comprehensive understanding of how these alternative energy sources are fundamentally reshaping global fleet strategies.

The Rise of Biomethanol: Scaling Up Low-Carbon Bunkering Infrastructure

The arduous journey toward global shipping decarbonization has recently witnessed one of its most significant contemporary victories in the realm of biomethanol adoption. Produced primarily from renewable or waste-based biomass, biomethanol presents an immediately viable pathway for drastic emissions reduction. Crucially, it offers a lifecycle greenhouse gas (GHG) emission reduction of more than 65% when compared head-to-head with conventional marine fuels.

Recently, a landmark maritime event materialized in China, underscoring the maturation and readiness of biomethanol supply chains on a global scale. The CMA CGM Group, acting in close collaboration with SIPG Energy, successfully executed the bunkering of 3,643 tons of biomethanol for the CMA CGM OSMIUM at Yangshan Port’s Shengdong Terminal. This newly delivered 13,000 TEU biomethanol dual-fuel containership is slated to operate on the bustling M2X service connecting Asia with Mexico, acting as a massive floating testament to sustainable, modern logistics.

This complex operation is far more than a mere technical achievement. It represents the largest single biomethanol bunkering volume ever completed at a Chinese port and marks CMA CGM’s first-ever biomethanol bunkering operation worldwide.

For executive leadership assessing long-term fleet transitions, the strategic takeaways from this milestone are profound and actionable:

• Integrated Supply Chains: The flawless execution of this bunkering was underpinned by robust resource coordination involving key suppliers like the Shanghai Electric Group, coupled with the established infrastructure support and bunkering services provided by SIPG Energy.
• Aggressive Fleet Expansion: Aligning tightly with its overarching commitment to achieving Net Zero Carbon by 2050, CMA CGM is preparing to operate approximately 200 dual-fuel container vessels by 2031. These vessels will be fully capable of running on advanced low-carbon energy sources, including bio-methanol, e-methanol, bio-LNG, and e-LNG.
• Global Hub Development: This operation solidifies Shanghai Port’s trajectory toward becoming a premier international sustainable marine fuel bunkering hub, directly supporting China’s broader national objectives for low-carbon and sustainable shipping.

Ethanol: A Commercially Scalable Alternative Fuel Pathway

As the push for global shipping decarbonization intensifies, ethanol is rapidly emerging as a formidable contender in the future multi-fuel landscape. Ethanol possesses unique chemical, environmental, and logistical properties that make it an exceptionally attractive candidate for large-scale fleet operations. It boasts lifecycle carbon neutrality, effectively reducing carbon emissions compared to traditional fossil fuels, while containing absolutely zero sulfur and exhibiting very low toxicity. Furthermore, because ethanol is biodegradable, water-soluble, and remains liquid at ambient temperatures and pressures, it allows for the use of standardized handling procedures during bunkering, dramatically simplifying otherwise complex and time-consuming onboard operations.

Recognizing this immense commercial potential, Everllence and Vale have recently forged a strategic cooperation agreement. This forward-thinking partnership is singularly focused on developing an advanced ethanol-powered engine based on the globally proven Everllence B&W ME-LGI (Liquid Gas Injection) platform.

This initiative perfectly aligns with Vale’s future-ready, multifuel strategy, which is designed to increase fleet flexibility and aggressively reduce greenhouse gas emissions across its vast affreighted fleet. Everllence’s foundational technical groundwork in this arena is already highly advanced. In late 2025, the company successfully ran a large 90-bore, two-stroke ME-LGIM (Liquid Gas Injection Methanol) engine entirely on ethanol at all load points during rigorous tests in Japan. Simultaneously, successful load tests were conducted on a four-stroke 21/31 dual-fuel GenSet at the company’s testing facilities in Denmark.

Key developmental focus areas for this pioneering ethanol pathway include:

• Technological Maturation: Expanding technical frameworks to seamlessly incorporate robust G70 and/or G80 engine platforms, specifically engineered for the heavy demands of large commercial vessels.
• Market Resonance and Localization: Targeting heavy logistics corridors, particularly in Brazil and China. These two markets are expected to see strong resonance due to their robust advocacy for ethanol as a premier energy-transition fuel.
• Future-Proofing Merchant Fleets: Delivering scalable, commercially viable engine technologies that empower maritime operators to responsibly transition away from fossil fuels while maintaining strict market competitiveness.

Breaking the Hydrogen Frontier in Deep-Sea Commercial Shipping

For decades, hydrogen has been heralded as the ultimate zero-emission holy grail of energy. However, its practical application in maritime contexts has historically been limited to short-distance, short-duration, and low-output vessels such as local sightseeing boats or harbor tugboats that rely entirely on compressed hydrogen. To achieve true, holistic global shipping decarbonization, the maritime industry must conquer the deep-sea, high-output commercial frontier.

A monumental breakthrough has now dramatically accelerated this timeline. Japan Engine Corporation (J-ENG), in a powerful strategic consortium with Kawasaki Heavy Industries, Mitsui O.S.K. Lines (MOL), MOL Drybulk, Onomichi Dockyard, and ClassNK, has successfully executed the world’s first factory operation of a hydrogen-fueled main engine designed specifically for a large commercial vessel.

Supported by the New Energy and Industrial Technology Development Organization’s (NEDO) Green Innovation Fund, J-ENG meticulously developed the 6UEC35LSGH a fully Japan-made, large, low-speed, two-stroke hydrogen-fueled engine. In groundbreaking factory testing phases, this engine achieved an unprecedented hydrogen co-firing ratio of over 95% at 100% load, unequivocally confirming both its profound greenhouse gas reduction capabilities and its stable operational performance under demanding conditions.

This massive leap in heavy engineering transitions hydrogen from a niche coastal novelty into a reliable powerhouse for global trade. The industrial implications are vast and transformative:

• Endurance and Raw Power: By pairing this high-efficiency, high-output, low-speed engine with liquefied hydrogen fuel (supplied via a state-of-the-art Marine Hydrogen Fuel System developed by Kawasaki), commercial ships can now confidently achieve the long-distance and long-duration operations required for exhaustive transoceanic voyages.
• Concrete Deployment Timelines: The newly developed marine engine is officially slated for shipment in January 2027. It will serve as the primary propulsion system for a robust 17,500-DWT hydrogen-fueled multi-purpose vessel constructed by Onomichi Dockyard.
• Rigorous Field Testing and Safety: Beginning in FY2028, MOL and MOL Drybulk will seamlessly operate the vessel for a comprehensive three-year demonstration period. Throughout the engine’s development, vessel design, and operation, ClassNK will conduct stringent safety evaluations to ensure commercial readiness.

Conclusion

The era of merely theoretical environmentalism in the maritime sector has firmly ended, rapidly replaced by an era of applied, heavy-industrial green innovation. As clearly evidenced by CMA CGM’s record-breaking biomethanol bunkering success, the highly strategic Everllence-Vale ethanol engine development, and the revolutionary ocean-going hydrogen engine engineered by J-ENG, MOL, and Kawasaki, the physical tools for ecological transformation are being actively forged and deployed today.

Transport Advancement believes that navigating the immense logistical complexities of global shipping decarbonization requires a concerted, adaptable multi-fuel approach. It is increasingly clear that no single alternative fuel will act as an absolute remedy. Instead, the future unquestionably belongs to those visionary operators who embrace technological flexibility, invest heavily in dual-fuel capabilities, and actively collaborate across the global supply chain. For maritime executives and corporate leaders, the underlying message is remarkably clear. The decarbonized future of global shipping is no longer waiting over the distant horizon. It is already docking at the port, ready to completely reshape the economics and environmental footprint of international trade.

By combining Hanwha’s technological strengths with RINA’s regulatory expertise, the initiative seeks to create a fully integrated offering for shipowners. The three Hanwha entities bring specialized capabilities spanning propulsion technologies, energy storage solutions, and systems integration, while RINA contributes its established credentials in certification and compliance. Together, the partners aim to support the maritime sector’s transition by developing and validating next-generation battery-hybrid propulsion systems that align with evolving environmental and operational requirements.

Within the framework of the project, Hanwha Power Systems will take the lead as system integrator, coordinating overall ship design and managing system interface development. Leveraging its engineering capabilities, it will integrate Hanwha Aerospace’s marine Energy Storage System and Hanwha Engine’s propulsion-engine technologies to produce an advanced vessel powered by battery-hybrid propulsion systems. Hanwha Aerospace will focus on strengthening safety and reliability by adapting aerospace-derived energy technologies for marine ESS applications, while Hanwha Engine will apply its expertise in medium-speed engines to enhance fuel efficiency and reduce carbon emissions.

RINA will assume responsibility for ensuring that the project meets all necessary regulatory and technical standards, covering both classification and statutory certification requirements. In addition, the organization will provide market insight support, drawing on its extensive background in the ferry sector to assist Hanwha in evaluating trends within this niche.

“This partnership brings together Hanwha’s core capabilities across energy-equipment, battery systems, and engine integration creating strong technological synergy,” said Kim Hyoung-Seog, Head of Hanwha Power Systems’ Marine Solutions Business Division.

“This agreement reflects the increasing pace of innovation required to meet the maritime sector’s decarbonization targets,” said Simone Manca, Vice President of North Asia Marine at RINA.

The engine, identified as 6UEC35LSGH, has reached a key milestone by initiating hydrogen co-firing operations across all cylinders. Designed as the world’s first full-scale unit intended for installation on an operational vessel, the hydrogen ship engine has already achieved a hydrogen co-firing ratio exceeding 95% at 100% load. This performance demonstrates both greenhouse gas reduction benefits and stable functionality. Further verification testing is planned to refine performance under hydrogen co-firing conditions, as developers continue to validate the system’s operational capabilities.

While hydrogen-powered vessels have gained traction in recent years both in Japan and internationally, most existing projects have focused on smaller-scale applications such as sightseeing boats or tugboats using compressed hydrogen for short-distance and low-output operations. In contrast, this initiative combines the high-efficiency, high-output, low-speed two-stroke 6UEC35LSGH hydrogen ship engine with liquefied hydrogen fuel. This approach is designed to support long-distance, long-duration, and high-output maritime operations, positioning it as a notable technological breakthrough toward the deployment of large oceangoing hydrogen-fueled merchant vessels.

J-ENG’s development draws on extensive research into hydrogen-compatible materials, combustion behavior, and durability of fuel injection systems. The engine is scheduled for shipment in January 2027, after completion of full-scale verification, and will be installed as the main propulsion unit on a 17,500-DWT hydrogen-fueled multi-purpose vessel being designed and constructed by Onomichi Dockyard. Kawasaki is simultaneously developing the MHFS hydrogen fuel supply system, which will be integrated into the vessel. MOL and Onomichi Dockyard have finalized contracts covering the vessel’s construction, while agreements on required onboard systems have also been concluded. The vessel’s detailed design is progressing steadily, with plans for a three-year demonstration phase beginning in FY2028 under MOL and MOL Drybulk operations. Throughout development, construction, and operation, ClassNK will oversee safety evaluations, as project partners continue efforts—supported by NEDO—to advance the practical deployment of the hydrogen ship engine and hydrogen-powered merchant shipping.

Under the collaboration, HD Hyundai and ABS will work together on the conceptual design of a 16,000-TEU container ship using nuclear-linked electric propulsion technology. A vessel of this scale is capable of transporting tens of thousands of cargo containers across global shipping routes. The project is intended to examine whether nuclear energy could provide a dependable and efficient power source for large vessels engaged in long-haul maritime operations. If successfully developed, the concept could represent a key step toward the future deployment of nuclear-powered container ships in international trade.

The engineering work associated with the project will address several technical components required for such vessels. These include the core design of electric propulsion systems connected to nuclear energy sources, the selection of electrical equipment, and the configuration of major onboard power systems. A central feature of the concept is the use of Small Modular Reactor (SMR) technology as the vessel’s primary energy source. These compact nuclear reactors are capable of generating up to about 100 megawatts (134,000 horsepower) of power. Because of their modular design and relatively smaller footprint, they offer potential advantages in integrating nuclear systems into maritime platforms such as nuclear-powered container ships.

Engineers from both organizations will analyze how these reactors could meet the significant energy demands of container ships operating over long ocean distances at high speeds. If the design proves viable, the propulsion concept could eliminate the need for conventional fossil-fuel engines in certain maritime applications. ABS, as a classification society, will play a critical role by assessing design standards and verifying that vessels meet international safety and operational requirements before entering service. HD Hyundai plans to develop a dedicated power management system tailored specifically for container ships operating with nuclear-linked electric propulsion.

Additional design elements include a twin-screw propeller arrangement, where two propellers operate simultaneously to improve thrust and maneuverability for large cargo ships navigating congested ports and restricted waterways. The concept also incorporates a direct-drive propulsion system that links the electric motor directly to the propeller, reducing mechanical losses typically associated with power transmission. Such features could enhance operational efficiency for future nuclear-powered container ships while reducing energy waste.

The vessel design may also allow operators to carry a greater number of refrigerated containers, or reefer units, which require significant electrical power to maintain low temperatures for frozen or chilled cargo. A stable and high-capacity power supply could support more of these energy-intensive containers, offering increased flexibility in cargo operations.

Safety considerations remain central to the development process. Engineers are working to incorporate strengthened safety standards directly into the ship’s design. Systems are planned to maintain secure operations even under extreme scenarios such as collisions or flooding. Power systems will also be designed to align with global regulations established by the International Maritime Organization and nuclear safety guidelines issued by the International Atomic Energy Agency.

HD Hyundai first presented its nuclear-powered container ships concept during the Houston Maritime Nuclear Summit in February last year. Later in the same year, the company received Approval in Principle from ABS for the propulsion concept at Gastech 2026, signaling continued progress in the development of nuclear-powered commercial shipping technology.

During the operation, a total of 3,643 tons of biomethanol were supplied, sourced from producers including Shanghai Electric Group at its production base in Taonan, Jilin province. The fueling activity set a new benchmark, recording the largest single biomethanol bunkering volume ever completed at a Chinese port.

The first biomethanol bunkering also aligns with the CMA CGM Group’s long-term environmental objectives. The company has committed to reaching Net Zero Carbon by 2050 and continues to adopt available technologies aimed at lowering the environmental impact of maritime transport and logistics operations. As part of this plan, the group is preparing to deploy around 200 dual-fuel container vessels by 2031. These ships will be capable of operating on a range of low-carbon fuels, including bio and e-LNG as well as bio and e-methanol, providing flexibility as the industry transitions toward cleaner energy sources.

CMA CGM’s cooperation with SIPG Energy and Shanghai Electric Group includes a long-term LNG bunkering partnership with SIPG as well as a framework agreement covering long-term biomethanol supply. These partnerships have helped create the conditions necessary for the first biomethanol bunkering to take place in China. The successful fueling of the CMA CGM OSMIUM also underscores the company’s commitment to expanding the use of sustainable alternative fuels throughout its network, while reinforcing Shanghai’s growing position as an international hub for sustainable marine fuels and supporting China’s ambitions for low-carbon shipping.

For the CMA CGM Group, the first biomethanol bunkering represents a historic moment and highlights Shanghai’s growing role within the company’s broader decarbonization strategy. Biomethanol, derived from renewable or waste-based biomass, is considered a low-carbon marine fuel capable of cutting lifecycle greenhouse gas emissions by more than 65% when compared with conventional marine fuels.