Case study: Hydrogen & e-fuels — a leading company's implementation and lessons learned

When Maersk announced in 2022 that it would order a fleet of methanol-capable container vessels, the decision sent a clear signal: the world's largest shipping company was betting on synthetic fuels as the pathway to maritime decarbonization. Four years later, that bet has produced a rich dataset of operational results, cost trajectories, and organizational transformations that offer practical lessons for any company navigating the hydrogen and e-fuels transition. This case study examines how Maersk's implementation unfolded, what worked, what proved more difficult than anticipated, and how the experience has reshaped the broader market for green hydrogen-derived fuels.

Why It Matters

The maritime shipping sector accounts for approximately 2.9% of global greenhouse gas emissions, roughly equivalent to the emissions of Germany. The International Maritime Organization (IMO) adopted a revised strategy in 2023 targeting net-zero greenhouse gas emissions from international shipping by approximately 2050, with intermediate checkpoints requiring a 20% reduction by 2030 and a 70% reduction by 2040 (compared to 2008 levels). These targets, combined with the EU Emissions Trading System extension to maritime transport beginning January 2024 and FuelEU Maritime regulations mandating progressive reductions in the greenhouse gas intensity of onboard energy, have created regulatory urgency for alternative fuels.

Green hydrogen and its derivative e-fuels, including e-methanol, e-ammonia, and synthetic kerosene, represent one of the most promising pathways to decarbonize hard-to-abate sectors. BloombergNEF estimated that the green hydrogen market reached $2.1 billion in 2025, with projections indicating growth to $50 billion by 2035. However, the pathway from pilot projects to commercial-scale deployment remains littered with technical, economic, and supply chain challenges that only real-world implementation experience can illuminate.

Company Background and Decision Process

Maersk, headquartered in Copenhagen, Denmark, operates roughly 700 vessels and handles approximately 17% of global container shipping volume. In 2018, the company set an ambitious target to achieve net-zero emissions across its entire operations by 2040, a full decade ahead of the IMO's then-prevailing 2050 target. This commitment required a fundamental rethinking of fuel strategy for a fleet that consumed approximately 12 million tons of fuel oil annually.

The company evaluated multiple alternative fuel pathways between 2019 and 2021, including LNG, biodiesel blends, green ammonia, battery-electric propulsion for short routes, and green e-methanol. The selection of e-methanol as the primary transition fuel reflected several considerations. First, methanol is liquid at ambient temperature and pressure, simplifying storage and bunkering compared to cryogenic LNG or pressurized hydrogen. Second, methanol's energy density, while lower than heavy fuel oil, provides sufficient range for major trade routes when paired with modestly larger fuel tanks. Third, methanol's existing global production and distribution infrastructure (approximately 98 million metric tons produced annually) provided a baseline logistics network that could be adapted for green variants.

Between 2021 and 2023, Maersk ordered 25 methanol-capable vessels from Hyundai Heavy Industries and other shipyards, including 16 large container ships in the 16,000-17,000 TEU class. These dual-fuel vessels can operate on conventional fuel oil or methanol, providing operational flexibility during the supply ramp-up period.

Execution and Implementation

Securing Green Methanol Supply

The most significant implementation challenge proved to be securing sufficient volumes of green e-methanol. At the time of vessel orders, global green methanol production capacity was effectively zero at commercial scale. Maersk addressed this through a portfolio approach to supply agreements.

In 2022, Maersk signed a partnership with European Energy to source approximately 10,000 tons of bio-methanol from a facility in Kasso, Denmark. In 2023, the company announced agreements with REintegrate (a subsidiary of European Energy), CIMC ENRIC, and Goldwind to develop green methanol production facilities in Denmark, China, and Spain. By early 2025, Maersk had secured offtake agreements totaling approximately 730,000 tons per year of green methanol, still short of the estimated 6 million tons needed to fuel its entire fleet on green methanol alone.

The supply challenge revealed a critical chicken-and-egg dynamic: fuel producers hesitate to invest in production capacity without committed offtakers, while shipping companies cannot commit to green fuels without assured supply. Maersk's approach of signing long-term offtake agreements (10-15 year terms) with price floors and volume commitments provided sufficient certainty for producers to proceed with facility construction.

Vessel Design and Operational Adaptations

The dual-fuel engine technology, developed primarily by MAN Energy Solutions and Wartsila, required modifications beyond the engines themselves. Methanol's lower energy density (roughly half that of heavy fuel oil by volume) necessitated fuel tanks approximately 2.5 times larger than conventional bunker tanks. On new-build vessels, this was accommodated through design integration, but it reduced cargo capacity by approximately 3-5% compared to conventional vessels of equivalent dimensions.

Safety systems required significant upgrades. Methanol is toxic if ingested and produces invisible flames when burning, unlike heavy fuel oil fires. Maersk worked with classification societies, including DNV and Lloyd's Register, to develop enhanced fire detection and suppression systems, enclosed fuel handling areas with vapor extraction, and crew training protocols specific to methanol operations. The company reported that crew training required approximately 120 additional hours per officer compared to conventional fuel handling certification.

First Commercial Voyages

Maersk's first methanol-capable vessel, the Laura Maersk, completed its maiden voyage in September 2023 on a route from South Korea to Copenhagen. The vessel operated on green methanol for approximately 60% of the voyage, switching to conventional fuel oil when methanol bunkering was unavailable at intermediate ports. Subsequent voyages through 2024 and early 2025 gradually increased the green methanol utilization rate as bunkering infrastructure expanded.

By Q4 2025, Maersk reported that its methanol-capable fleet achieved an average green methanol utilization rate of approximately 45% across all voyages. The gap from 100% reflected three factors: limited bunkering infrastructure at many ports, periodic green methanol supply shortfalls during facility commissioning, and operational decisions to conserve green methanol for routes where EU ETS carbon costs made it economically favorable.

Measured Results

Emissions Performance

When operating on green e-methanol produced from renewable electricity and biogenic CO2 (captured from biogas plants or direct air capture), the vessels achieved well-to-wake greenhouse gas reductions of 60-85% compared to heavy fuel oil, depending on the methanol production pathway. Bio-methanol produced from agricultural waste feedstocks delivered 60-65% reductions. E-methanol synthesized from green hydrogen and direct air capture CO2 achieved 80-85% reductions on a lifecycle basis.

On a fleet-wide basis, incorporating periods of conventional fuel operation, Maersk reported a 15% reduction in Scope 1 emissions intensity (grams of CO2 equivalent per TEU-kilometer) across its methanol-capable vessels in 2025 compared to its conventional fleet baseline. This figure reflects the blended utilization rate rather than the per-voyage potential.

Cost Analysis

Green e-methanol costs ranged from $800 to $1,400 per ton during 2024-2025, compared to $400-600 per ton for conventional very low sulfur fuel oil (VLSFO). On an energy-equivalent basis, green methanol cost approximately 2.5-3.5 times more than fossil alternatives. However, several factors partially offset this premium.

EU ETS carbon costs, which reached approximately 70 EUR per ton of CO2 in 2025, reduced the effective cost gap. For voyages within EU jurisdiction, the carbon price effectively added $150-200 per ton to conventional fuel costs, narrowing the green premium to approximately 1.8-2.5 times conventional fuel. FuelEU Maritime penalties, beginning in 2025 with progressive tightening through 2050, created additional financial incentives for green fuel adoption.

Maersk passed a portion of the green fuel premium to customers through its ECO Delivery product, which allows shippers to pay a surcharge (typically $10-30 per container, depending on route and volume) to allocate green methanol usage to their cargo. By late 2025, ECO Delivery customers accounted for approximately 25% of Maersk's container volumes, indicating meaningful willingness to pay among brand-conscious shippers and those with Scope 3 reduction commitments.

Operational Reliability

Engine reliability on methanol operation proved comparable to conventional fuel operation after an initial learning period. Maersk reported 99.2% engine availability across its methanol-capable fleet in the 12 months ending December 2025, compared to 99.5% for its conventional fleet. The 0.3 percentage point gap was attributed primarily to early-stage sensor calibration issues and conservative operating protocols during the fleet integration period rather than fundamental technology limitations.

Key Lessons Learned

Supply Chain Development Requires Patient Capital

Maersk invested approximately $1.4 billion in green methanol supply chain development between 2021 and 2025, including equity investments in production facilities, long-term offtake agreements with price guarantees, and bunkering infrastructure co-investments. This level of demand-side investment was necessary because green methanol production faced a classic first-mover financing gap: project costs were too high and demand too uncertain for traditional project finance. Companies considering hydrogen or e-fuel adoption should expect to participate actively in supply chain financing rather than waiting for market-driven supply to emerge.

Dual-Fuel Flexibility Is Essential During Transition

The decision to specify dual-fuel (methanol/fuel oil) rather than methanol-only engines proved operationally critical. Green methanol supply interruptions, bunkering infrastructure gaps, and price volatility all required the ability to switch to conventional fuel without operational disruption. Maersk indicated that methanol-only vessels would have faced 15-25% more port delays due to bunkering constraints during 2024-2025.

Regulatory Arbitrage Shapes Deployment Priorities

Maersk systematically prioritized green methanol allocation to routes and voyages where regulatory carbon costs were highest, primarily EU-touching trade lanes. This rational economic behavior means that emissions reductions concentrate geographically rather than distributing evenly across global operations. For policymakers, this underscores the importance of carbon pricing mechanisms in driving actual fuel switching. For companies, it highlights the need for route-level carbon cost modeling when planning fuel transition strategies.

Customer Co-Investment Accelerates the Transition

The ECO Delivery product demonstrated that a meaningful segment of shippers will pay a green premium when the emissions reduction is transparently verified and attributable to their specific cargo. Maersk reported that ECO Delivery revenues covered approximately 40% of the incremental cost of green methanol in 2025, materially improving project economics. Companies in other hard-to-abate sectors should explore similar product-level green premium mechanisms to share transition costs with supply chain partners.

Workforce Transformation Takes Time

Transitioning from conventional fuel operations to methanol required more extensive workforce development than initially anticipated. Beyond engine room officers, port terminal workers, procurement teams, and sustainability reporting staff all required new competencies. Maersk established a dedicated green fuels training center in Copenhagen and developed e-learning modules for its global workforce. The company estimated that full organizational readiness lagged vessel delivery by approximately 12-18 months.

Broader Market Implications

Maersk's implementation has catalyzed broader market development. By late 2025, competitors including CMA CGM, MSC, and Hapag-Lloyd had placed orders for methanol, ammonia, or LNG-capable vessels. Total methanol-capable vessel orders reached approximately 200 globally by year-end 2025, up from fewer than 30 in early 2023. The Port of Rotterdam, Port of Singapore, and Port of Shanghai all announced green methanol bunkering facilities scheduled for completion between 2026 and 2028.

Green methanol production capacity under development globally reached approximately 8 million tons per year by early 2026, though only a fraction had reached final investment decision. The pipeline includes projects from Orsted, European Energy, Siemens Energy, and Thyssenkrupp Nucera, among others.

Action Checklist

• Conduct a fleet-level or operations-level assessment of hydrogen and e-fuel applicability, including energy density, bunkering logistics, and regulatory exposure
• Evaluate dual-fuel equipment options to maintain operational flexibility during the supply transition period
• Engage potential e-fuel suppliers early and consider long-term offtake agreements to enable production investment
• Model route-level or use-case-level carbon costs under current and anticipated regulations to identify highest-value transition priorities
• Develop customer-facing green premium products to share transition costs with supply chain partners
• Establish workforce training programs covering safety, operations, procurement, and sustainability reporting for new fuel pathways
• Join industry coalitions and port-level bunkering consortia to share infrastructure development costs
• Set interim milestones for green fuel utilization rates, recognizing that 100% green operation may take 5-10 years to achieve

Sources

• International Maritime Organization. (2023). 2023 IMO Strategy on Reduction of GHG Emissions from Ships. London: IMO.
• BloombergNEF. (2025). Hydrogen Economy Outlook: Market Sizing and Cost Trajectories. New York: Bloomberg LP.
• Maersk. (2025). Sustainability Report 2024: Green Fuels Progress Update. Copenhagen: A.P. Moller-Maersk.
• DNV. (2025). Maritime Forecast to 2050: Alternative Fuel Pathways and Fleet Readiness. Hovik, Norway: DNV.
• International Renewable Energy Agency. (2025). Green Hydrogen and E-Fuels: Innovation Landscape for Maritime Decarbonization. Abu Dhabi: IRENA.
• European Commission. (2024). FuelEU Maritime Regulation: Implementation Guidance and Compliance Framework. Brussels: EC.
• MAN Energy Solutions. (2025). Two-Stroke Methanol Engine Technology: Operational Performance and Fleet Integration Report. Copenhagen: MAN ES.