LNG vs methanol vs ammonia — alternative marine fuels compared
The three main alternative marine fuels contesting the IMO 2050 net-zero pathway — LNG (mature), methanol (rapidly scaling), ammonia (still emerging). Bunker infrastructure, safety training, and career implications.
Side-by-side
| Criterion | LNG Liquefied Natural Gas — mature dual-fuel. | Methanol Methanol dual-fuel — rapidly scaling. | Ammonia NH3 dual-fuel — emerging. |
|---|---|---|---|
| CO₂ reduction vs HFO | 20-30% (tank-to-wake) | 6-9% grey; 90%+ green (bio/e-methanol) | 100% at combustion (grey has WtT emissions) |
| Energy density | 24 GJ/m³ | 16 GJ/m³ | 13 GJ/m³ |
| Fleet in service (2025) | ~800 vessels + orderbook | ~250 in service + 400+ orderbook | ~5 pilot vessels; 10+ orderbook |
| Bunker infrastructure | Global — 200+ ports | Growing — 30+ ports | Very limited — pilot only |
| Safety training | STCW A-V/3 gas + IGF Code familiarisation | IGF Code + methanol-specific | IGC Code + specialist NH3 training |
| Toxicity | Low (methane) | Moderate (methanol vapor) | High (NH3 lethal at 500 ppm) |
| Officer premium | +5-10% | +8-15% | +15-25% (once operational) |
Who each suits
- LNG
Officers seeking mature dual-fuel career now. Q-Max, CMA CGM ULCV, Norwegian offshore fleet.
- Methanol
Officers positioning for 2025-2030 growth. Maersk methanol-fuelled container fleet leading the segment.
- Ammonia
Early-adopter officers building 2030+ credentials. Pilot vessels rare but critical experience.
Pros and cons
LNG
Pros
- Mature.
- Global bunker network.
- Established training pathway.
Cons
- Only 20-30% CO₂ reduction.
- Methane slip concern.
- Not aligned with 2050 net-zero.
Methanol
Pros
- Green methanol enables 90%+ reduction.
- Ambient storage.
- Rapidly scaling.
Cons
- Lower energy density than LNG.
- Green methanol supply limited.
Ammonia
Pros
- Zero-carbon at combustion.
- Green NH3 aligns with 2050 net-zero.
- Pathway to hydrogen economy.
Cons
- High toxicity.
- N₂O slip emerging concern.
- Very limited bunker infrastructure.
Common misunderstandings
- 'LNG is a green fuel.' Only 20-30% CO₂ reduction vs HFO; methane slip can eliminate that gain on some engines.
- 'Ammonia is safer than LNG.' Ammonia is dramatically more toxic than LNG; safety training is much more intensive.
Related
High confidence
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