Solid Oxide Fuel Cells in Maritime: Efficiency, Flexibility, and Decarbonization

The maritime industry is under unprecedented pressure to decarbonize. New IMO regulations, tightening emissions caps, and rising fuel costs demand solutions that go beyond incremental improvements. Solid Oxide Fuel Cells (SOFCs) are emerging as one of the most promising pathways, offering high efficiency, fuel flexibility, and a clear roadmap toward zero-carbon operations.

Sources: Enki

The Problem: Why Tracking SOFC Adoption in Shipping Is Difficult

For shipowners, investors, and policymakers, understanding SOFC adoption is challenging:

• Fragmented pilots: Dozens of projects span auxiliary power, propulsion, and hybrid systems.

• Fuel uncertainty: LNG, ammonia, hydrogen, and methanol each require different infrastructure and economics.

• Scaling gap: Most SOFC projects remain pilots (80–500 kW), while true propulsion systems need 10–20 MW.

• Complex ecosystem: Shipbuilders, classification societies, and technology developers must align on certification and integration.

The result is a moving target. Missing the right signal could mean locking in vessels with stranded assets. For context, see What is Fuel Cells?.

Why SOFCs Are Attractive for Maritime

SOFCs directly convert chemical energy to electricity without combustion, achieving 60% electrical efficiency. Integrated with waste-heat recovery systems like gas turbines or organic Rankine cycles, total efficiency rises even higher.

• Fuel Flexibility: Operates on LNG today and transitions to ammonia or hydrogen tomorrow.

• Emissions Reduction: Eliminates NOx and SOx, reduces particulates, and cuts GHG by up to 34% on LNG compared to diesel.

• Future-Proofing: Modular design allows gradual scaling without full powertrain replacement.

Takeaway: SOFCs give owners optionality, bridging current LNG investments with future green fuels.

Applications and System Configurations

SOFCs are being deployed in multiple roles depending on vessel type and mission profile.

Auxiliary Power Units (APUs)

• Immediate use case: replacing diesel gensets for onboard systems.

• Power range: 80–500 kW.

• Examples: Alma Clean Power with Odfjell and DNV testing an 80 kW SOFC on a chemical tanker.

Hybrid Systems

• SOFC + ICE: Baseload from SOFC, peak from internal combustion.

• SOFC + Gas Turbine: Uses SOFC exhaust heat to drive turbines, boosting efficiency.

• SOFC + Battery: Smooths load dynamics, handles transients, extends component life.

Primary Propulsion

• Large-scale ambition: cruise ships and carriers powered by 10–20 MW SOFC systems.

• German Aerospace Center (DLR) and MSC are testing feasibility on the World Europa class.

Commercialization and Demonstration Projects

Takeaway: From LNG carriers to chemical tankers, pilots are maturing across multiple vessel classes.

Key Corporate Players and Investments

• HD Hyundai: Invested €45M in Elcogen, signed MoUs with Lloyd’s Register and DNV for hybrid SOFC propulsion and CO₂ capture.

• Bloom Energy: Supplying its 300 kW Marine Power Module for MOL/SHI LNG carrier.

• Doosan Fuel Cell / HyAxiom: First SOFC stack to pass environmental tests for maritime certification.

• Ceres Power: Partnered with Alma Clean Power on marine demonstration projects.

Takeaway: Asian shipbuilders and European tech developers are building cross-regional alliances to scale SOFC adoption.

Market Growth Outlook

The maritime SOFC market is still small but growing rapidly:

• Auxiliary projects in the 80–500 kW range are proving reliability.

• Scalability studies show SOFC plants could reach 10–20 MW for propulsion.

• Hybrid SOFC-battery systems are considered the most commercially viable architecture for the next decade.

For broader market sizing across all sectors, see solid oxide fuel cells applications.

Challenges to Adoption

SOFCs must overcome hurdles before widespread rollout:

• Cost: Capex remains high relative to diesel and LNG engines.

• Durability: Harsh marine conditions and load variability challenge stack longevity.

• Fuel Infrastructure: LNG is available, but ammonia and hydrogen bunkering remain limited.

For more, see Top challenges of fuel cells.

Next Steps & Recommendations

SOFCs are no longer theoretical—they are entering real-world fleets. For decision-makers:

• Track pilot results: Projects like HELENUS and MOL LNG carrier will provide critical durability and cost data.

• Watch hybrid systems: SOFC-battery and SOFC-ICE combinations are leading contenders for near-term scale.

• Follow corporate strategies: Investments by HD Hyundai, Bloom, and Ceres indicate where the supply chain is consolidating.

• Align with policy: EU green corridors and IMO targets will accelerate commercial adoption.

Read the full analyst report: Enki Research delivers source-backed intelligence on SOFC companies, projects, and policy shifts.

Next Questions

• What are the SOFCs applications in maritime?

• What are the growth opportunities in SOFCs?

• What are the recent trends in fuel cells?