How big is the ammonia fuel opportunity, and who stands to gain?
Ammonia is a serious contender for decarbonizing shipping and aviation because it produces zero CO2 at the point of use and has a higher energy density than hydrogen, meaning it takes up less space on a ship or plane [4]. The scale is enormous: shipping alone transports about 90% of global trade, and the International Maritime Organization aims to cut greenhouse gas emissions by 50% by 2050 [5]. Ammonia is already produced in vast quantities for fertilizer, so there is an existing supply chain and handling expertise to build on [3]. But that existing infrastructure is concentrated in countries with cheap fossil gas, not necessarily in the Global South. The opportunity for economic development is real: countries rich in renewable energy could produce green ammonia and export it, creating new industries [4]. However, the same studies warn that the required investments in production, storage, and safety are huge, and without coordinated policy, only wealthy nations may be able to afford the transition [4][5].
Where exactly do the equity problems show up?
The equity problems are not hypothetical — they show up in the economics of ammonia fuel itself. One study of an ammonia-fueled ammonia carrier (a ship that carries ammonia as cargo and uses it as fuel) found that the profit margin is highly sensitive to both the price of ammonia fuel and the transport fee for carrying ammonia as cargo [2]. If ammonia fuel prices rise by 25%, profits drop by 15%; if transport fees fall by 25%, profits drop by 45% [2]. This means that regions with cheap renewable energy and existing ammonia production (like the Middle East or parts of Europe) will have a huge cost advantage, while countries that must import green ammonia will face higher fuel costs. Another study highlights that developing a global green ammonia supply chain requires massive investments in production facilities, storage, and safety infrastructure [4]. Without deliberate policy to share these costs — for example, through international funds or technology transfer — the transition could concentrate wealth in energy-rich regions and leave others behind. The studies agree that safety training and standardized regulations are also needed [4][5], and these will be easier for wealthy nations to implement quickly.
Can we scale ammonia fuel without making equity worse?
The evidence suggests it is possible, but only with intentional policy. The studies point to several levers: first, ammonia's existing supply chain in the fertilizer industry means that many countries already have some handling expertise, which could be a starting point [3][4]. Second, the fuel's higher energy density compared to hydrogen means less storage space is needed, which could lower infrastructure costs for smaller ports and developing nations [4]. Third, the same studies that flag equity risks also note that ammonia can act as a hydrogen carrier, enabling countries with abundant renewable energy to export green energy in a stable, transportable form [4]. This could actually create new economic opportunities for the Global South if the production facilities are built there. However, the studies also warn that competing zero-carbon alternatives (like hydrogen or sustainable aviation fuels) could emerge and leave ammonia investments stranded [4]. The bottom line: scaling ammonia cleanly is technically feasible, but avoiding new equity problems requires international cooperation on infrastructure funding, technology sharing, and safety standards — not just market forces.
About These Sources
This answer is built on 5 peer-reviewed studies — published from 2021 to 2024, 3 from 2024 or later, 1 in Q1 journals, collectively cited 137 times — selected as the most relevant from 5 studies that passed quality screening, drawn from 36 papers retrieved from a database of over 500 million.
Sources used in this answer
Ammonia as a sustainable fuel: Review and novel strategies
This comprehensive review of ammonia as a fuel for internal combustion engines identifies key technical barriers (high ignition temperature, slow flame speed) and strategies to overcome them, but does not address equity or economic distribution.
Economic Evaluation of an Ammonia-Fueled Ammonia Carrier Depending on Methods of Ammonia Fuel Storage
An economic evaluation of an ammonia-fueled ammonia carrier found that installing separate fuel tanks (avoiding cargo loss) yields $53.1 million higher profit over the ship's life, and that profit is highly sensitive to ammonia fuel price (±25% change causes ±15% profit change) and transport fee (±25% change causes ±45% profit change).
Challenges and Opportunities of Ammonia as a Zero-Emission Aircraft Fuel
This paper identifies ammonia as a promising near-zero-emission aviation fuel due to its existing large-scale supply chain from the fertilizer industry, higher energy density than hydrogen, and non-coking properties that enable heat exchanger use for engine cooling.
Ammonia: a clean fuel for a cleaner future
A SWOT analysis of ammonia as marine fuel highlights that developing a global green ammonia supply chain presents an opportunity for economic development in renewable-rich countries, but requires massive investments in infrastructure, safety protocols, and crew training, and faces threats from competing zero-carbon alternatives.
Ammonia as Clean Shipping Fuel for the Baltic Sea Region
This study benchmarks ammonia against marine gas oil and LNG for Baltic Sea shipping, concluding that ammonia can fulfill future decarbonization demands but requires significant infrastructure development and standardized safety regulations, with economic viability depending on regional renewable energy availability.