A.P. Moller – Maersk has successfully advanced its alternative fuel strategy by executing a large-scale, barge-to-ship bunkering of 100% pure ethanol aboard the Laura Mærsk in Rotterdam. This milestone transitions the carrier’s proven “dual-fuel alcohol” engine capabilities from experimental, truck-scale testing into a mature, waterborne port supply chain designed to hedge against future green fuel shortages.
Rotterdam | June 5, 2026 – In a move that fundamentally redefines the maritime sector’s commercial evaluation of alternative power, A.P. Moller – Maersk has successfully completed a large-scale, barge-to-ship bunkering operation utilizing 100% pure ethanol aboard its pioneering container vessel, Laura Mærsk.
The operation, executed at the Port of Rotterdam, marks the second time the vessel has run on pure ethanol. However, the true breakthrough lies in the logistics. Unlike early trials relying on highly controlled, truck-to-ship deliveries, this operation utilized a commercial bunker barge. By moving high volumes over the water in Europe’s busiest bunkering hub, Maersk successfully tested the alternative fuel supply chain under real-world, high-capacity port conditions.
This milestone is the direct culmination of an aggressive, multi-tiered testing strategy launched in late 2025. By systematically scaling from a cautious 10% blend (E10) to a highly demanding 50% mix (E50), and finally to 100% pure ethanol via commercial barge infrastructure, Maersk has officially introduced a new asset class to the global maritime energy market: the dual-fuel alcohol vessel.
The Operational Roadmap: From Lab Blend to Commercial Scale
Maersk’s fuel strategy has progressed with remarkable speed, transitioning from a theoretical engineering exercise to a scalable marine fuel pathway in less than a year.
1. The E10 Baseline (October–November 2025)
The journey began with a controlled pilot aboard the 2,100 TEU Laura Mærsk, blending 10% anhydrous ethanol with 90% e-methanol. The trial was a decisive technical success, confirming that the fuel blend ignited and burned as efficiently as pure methanol. Crucially, engineers recorded no degradation in engine efficiency, reliability, or safety, validating baseline ignition quality, combustion stability, lubricity, and NOx emissions.
2. The E50 Threshold (December 2025)
Building on the E10 data, Maersk immediately escalated to an E50 blend (50% ethanol / 50% methanol). This represented a drastic, highly complex chemical shift. Though both are alcohols, increasing the ethanol content significantly alters fuel density, viscosity, ignition delay, and flame characteristics. The E50 trials forced the vessel’s injection systems to handle different combustion temperature profiles and monitored long-term cylinder wear under heavy operational loads.
3. The 100% Commercial Bunkering Milestone
Having mastered the combustion mechanics of high-blend mixtures, Maersk’s latest Rotterdam operation shifted focus from the engine room to the port infrastructure. Transitioning to barge-to-ship delivery simulated the exact commercial pressures, pumping rates, and safety protocols required for global scaling.
Engineering Breakdown: Inside the “Alcohol” Engine
The Laura Mærsk’s Everllence G50-LGIM dual-fuel engine was initially celebrated as a milestone for green methanol. However, this progressive trial timeline proves the architecture is inherently flexible across the alcohol spectrum.
| Fuel Milestone | Composition | Technical Focus | Logistics Model |
| Methanol Baseline | 100% MeOh | Fleet standard; slashes SOx by 99%, NOx by 60% | Commercial Tanker / Barge |
| E10 Trial | 90% MeOh / 10% EtOh | Ignition stability, flame behavior, lubricity | Controlled Truck Injection |
| E50 Trial | 50% MeOh / 50% EtOh | Viscosity changes, injection timing, cylinder wear | Controlled Truck Injection |
| Current Milestone | 100% EtOh | Flow rates, vapor recovery, marine terminal safety | Commercial Bunker Barge |
Because alcohols are inherently “dry” fuels, a primary concern throughout the E10 and E50 phases was fuel system corrosiveness and lubricity. The successful execution of the 100% ethanol barge trial confirms that the vessel’s fuel infrastructure, pumps, and seals can handle pure ethanol’s unique physical properties at commercial flow rates.
The Strategic Hedge: Tapping an Entrenched Global Commodity
Maersk’s rapid acceleration into ethanol is a calculated macroeconomic maneuver. While green e-methanol remains the carrier’s core primary pathway toward its net-zero 2040 target, the global supply chain for synthetic and bio-methanol faces severe scaling bottlenecks and project delays.
Ethanol, by contrast, is a mature, globally built-out commodity. The United States and Brazil alone command 80% of global production, backed by over 200 biorefineries in the U.S. capable of churning out 17 billion gallons annually. As global road transport rapidly electrifies, these agricultural energy giants are aggressively hunting for new industrial consumers. Maritime shipping represents the ultimate high-volume growth market.
By proving that its fleet can seamlessly ingest everything from E10 to 100% pure ethanol via standard waterborne bunker barges, Maersk has insulated itself from regional fuel shortages. If green methanol is scarce or overpriced in a particular port, the carrier can now confidently pivot to the ethanol market.
The Sustainability Mandate: Safeguarding the Lifecycle
While ethanol solves the scalability puzzle, it introduces rigid compliance hurdles regarding sourcing. Unlike synthetic e-methanol, agricultural ethanol risks competing with food security or driving deforestation.
To maintain its strict mandate of a minimum 65% lifecycle GHG reduction for transitional fuels, Maersk’s Energy Markets team, led by Emma Mazhari, is subjecting its ethanol supply chain to rigorous auditing:
- Traceability Certification: Mandating strict ISCC (International Sustainability and Carbon Certification) or RSB (Roundtable on Sustainable Biomaterials) tracking.
- Land-Use Protections: Ensuring feedstocks do not cause land conversion, deforestation, or biodiversity loss.
- Food vs. Fuel Mitigation: Prioritizing industrial starch, sugarcane, or agricultural waste over feedstocks that disrupt global food supplies.
Industry Implications: The Multi-Fuel Fleet is Here
With 19 dual-fuel vessels already operating in its fleet by the end of 2025, and liquefied biomethane (Bio-LNG) set to join the portfolio by 2027, Maersk is demonstrating that the future of green shipping will not rely on a single silver-bullet fuel.
The success of the Rotterdam barge bunkering sends an unmistakable signal to energy markets worldwide: the era of the single-fuel vessel is drawing to a close. The future belongs to agile operators commanding “dual-fuel alcohol” fleets, capable of leveraging shifting global commodities to maintain uninterrupted, net-zero supply chains.
About A.P. Moller – Maersk
A.P. Moller – Maersk is a global leader in integrated logistics, committed to connecting and simplifying its customers’ supply chains. With operations in over 130 countries and a workforce of around 100,000 employees, Maersk is at the forefront of shipping, terminal operations, and logistics solutions.
The company is driving the transition to sustainable shipping, aiming to achieve net-zero GHG emissions by 2040 through investments in alternative fuels, energy-efficient vessels, and digital innovation with at least 65% lifecycle emissions reductions, and extensive efficiency measures such as this retrofit programme. Maersk is dedicated to shaping the future of global trade with end-to-end supply chain solutions that enhance efficiency, reduce costs, and promote environmental sustainability.
Source: Maersk