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Green Ammonia

Green Ammonia is ammonia (NH₃) produced without fossil fuels, using renewable energy, making it a near zero-carbon marine fuel.

How Green Ammonia is Produced

1️⃣ Renewable electricity (solar, wind, hydro)
2️⃣ Water electrolysis → Green hydrogen
3️⃣ Nitrogen extracted from air
4️⃣ Hydrogen + Nitrogen → Ammonia (NH₃) via Haber–Bosch process

👉 No CO₂ emissions during production.

Why It Is Important for Shipping

Driven by decarbonization targets of the International Maritime Organization

Advantages

  • Zero CO₂ emissions at point of use

  • Carbon-free fuel

  • Suitable for long-distance shipping

  • Easier storage than hydrogen (liquid at −33°C)

Comparison with Other Ammonia Types

Type            Production Method                CO₂ Emissions
Grey Ammonia            Fossil fuel                    High
Blue Ammonia            Fossil fuel + CCS                    Low
Green Ammonia            Renewable energy                    Zero

Challenges in Marine Use

⚠️ Highly toxic
⚠️ Requires special fuel systems
⚠️ Lower energy density than HFO
⚠️ NOx emissions need control
⚠️ Limited global bunkering infrastructure

Engine & Safety Considerations 

  • Ammonia-ready or dual-fuel engines

  • Double-walled fuel piping

  • Gas detection & ventilation

  • Emergency shutdown systems

  • Crew training & PPE

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