Ammonia as a Hydrogen Carrier: The Export Market

Ammonia is made by combining hydrogen with atmospheric nitrogen via the Haber-Bosch process. It's liquid at modest pressure and room temperature (versus hydrogen which requires –253°C to liquefy), it has existing global shipping and handling infrastructure, and it's denser in hydrogen content than liquid hydrogen itself. For these reasons, it's emerged as the leading candidate for long-distance hydrogen trade.

The round-trip math

Converting hydrogen to ammonia costs roughly 10–15% of the input energy (Haber-Bosch process). Reconverting ammonia back to hydrogen at the destination costs another 15–25% (ammonia cracking). Total round-trip energy loss: 25–35%.

This is less efficient than direct hydrogen pipeline (2–5% loss) but dramatically better than direct hydrogen shipping (hydrogen liquefaction alone is 30–35% loss, plus boil-off losses during transport). For overseas routes, ammonia wins on total cost.

The export corridors

Several major hydrogen-as-ammonia export corridors are in development:

• Middle East → Europe / Japan / Korea: Saudi Arabia's NEOM project and UAE projects anchored by green hydrogen production at $2–3/kg delivered as ammonia
• Australia → Japan / Korea: Major green hydrogen projects in Western Australia and Queensland targeting Asian markets
• North America → Europe: US Gulf Coast and Canadian blue/green hydrogen production targeting EU markets driven by CBAM and REPowerEU
• Chile → Multiple: Magallanes region wind-driven green hydrogen with multiple offtake markets

End-use configurations

At the destination, ammonia has three pathways:

1. Cracked back to hydrogen for use in existing hydrogen applications (refining, chemicals, fuel cells). Requires cracking infrastructure at destination.
2. Used directly as ammonia in applications that tolerate it — fertilizer (the historical use), some power generation (ammonia co-firing is being piloted), and marine fuel (emerging).
3. Blended into fertilizer production as a bridge application where existing ammonia infrastructure is already in place.

The challenges

Ammonia is toxic. Handling regulations are strict. Safety incidents — the most famous being the 1976 Houston ammonia leak — have shaped public perception. Any large-scale expansion of ammonia shipping requires serious community and regulatory engagement.

Ammonia combustion also produces NOx, which requires post-combustion treatment. For power generation applications, this can significantly increase levelized cost.

The Axis view

Ammonia as a hydrogen carrier is likely to dominate the long-distance hydrogen trade for the next decade, simply because no alternative is close. Projects positioning as anchor production in export corridors have strong financial profiles but significant political and community engagement requirements.