TECHNOLOGY COMPARISON
e-Methanol vs e-Methane
Overview:
e-Methanol and e-methane can both be produced using renewable hydrogen and captured carbon, but their physical properties create very different fuel systems.
e-Methanol is a liquid under normal ambient conditions, making it easier to store and handle without cryogenic equipment. e-Methane is a gas and is generally stored in compressed or liquefied form, requiring pressure-resistant or cryogenic tanks.
e-Methanol may offer simpler onboard storage, while e-methane can benefit from existing LNG infrastructure and established gas-engine technology.
Approach:
The comparison should consider the complete fuel pathway, including production, storage, transport, bunkering, engine compatibility and lifecycle emissions.
Important factors include tank volume, fuel-handling requirements, methane leakage, combustion emissions, infrastructure availability and vessel design.
Neither fuel is universally superior. The more suitable option depends on the existing fleet, port infrastructure, operating profile and engine technology.
Comparison Criteria
• Physical state: e-Methanol is liquid at ambient conditions, while e-methane is gaseous
• Storage: e-Methanol uses liquid-fuel tanks, while e-methane requires compressed or cryogenic storage
• Infrastructure: e-Methane can use parts of existing LNG infrastructure
• Engine requirements: Both fuels require dedicated or adapted engine systems
• Tank volume: Both generally require more onboard storage volume than conventional marine fuels
• Fuel handling: e-Methanol avoids cryogenic systems but requires careful management because of toxicity and material compatibility
• Operational emissions: e-Methane can produce methane slip, while e-methanol combustion releases carbon dioxide
• Lifecycle impact: Performance depends on renewable electricity, carbon source, production efficiency, transport and final use
Best-Fit Applications
e-Methanol
• New methanol-capable ships
• Dual-fuel marine engines
• Ports developing methanol bunkering
• Applications prioritising ambient liquid storage
• Operations where cryogenic systems are impractical
• Chemical and industrial applications
e-Methane
• Existing LNG-capable ships
• Ports with established LNG infrastructure
• Gas-engine and dual-fuel fleets
• Regional methane supply networks
• Applications able to manage cryogenic storage
• Fleets transitioning from fossil LNG to renewable methane
Key Takeaway
e-Methanol offers ambient liquid storage and avoids methane-slip emissions, but it requires adapted engines, additional tank volume and careful fuel handling.
e-Methane can use established LNG infrastructure and gas-engine technology, but its lifecycle performance depends on controlling methane leakage and unburned methane.
The more suitable option depends on vessel design, existing infrastructure, engine technology and verified lifecycle performance.
