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Brian Westenhaus

Brian Westenhaus

Brian is the editor of the popular energy technology site New Energy and Fuel. The site’s mission is to inform, stimulate, amuse and abuse the…

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Evaluating Ammonia's Role in Sustainable Shipping

  • Ammonia as a marine fuel can lead to eutrophication, acidification, and emissions of potent greenhouse gases like laughing gas.
  • The production of green ammonia is energy-intensive, and its use may not be as environmentally friendly as anticipated due to the risk of creating new problems.
  • The study suggests that there is no one-size-fits-all solution for decarbonizing shipping and emphasizes the need for more research and life cycle analyses to evaluate different fuel options.

Chalmers University of Technology researchers show in a study where the researchers carried out life cycle analyses for batteries and for three electrofuels including ammonia.

The report has been published in Applied Energy.

Switching to ammonia as a marine fuel, with the goal of decarbonization, can instead create entirely new problems. Eutrophication and acidification are some of the environmental problems that can be traced to the use of ammonia – as well as emissions of laughing gas, which is a very potent greenhouse gas.

In the search for viable fossil-free marine fuels, ammonia has been on the agenda for several years as one of the strongest alternatives.

Ammonia (NH3) is a carbon-free fuel and has the advantage of a higher energy density than, for example, hydrogen.

It can also be liquefied fairly easily although it is a gas at standard conditions.

However, a significant disadvantage is that the production of electro-ammonia – which requires electricity – is very energy intensive.

Moreover, the new study shows that an eagerness to rid the shipping sector of carbon emissions, by using ammonia, might create entirely new problems instead.

Selma Brynolf, Chalmers researcher and co-author of the paper noted, “Although ammonia is carbon-free, its combustion in engines is not free from greenhouse gas emissions. Engine tests have shown varying degrees of emissions of laughing gas, which is a very potent greenhouse gas with more than 200 times the global warming impact than carbon dioxide.”

Fayas Malik Kanchiralla, PhD student at the Department of Mechanics and Maritime Sciences at Chalmers and lead author of the paper added, “There is simply a lack of deeper risk analyses of what a switch to ammonia could mean.”

The alternative with the lowest cost is environmentally problematic

The researchers used life cycle assessment and life cycle cost to evaluate technical viability, environmental impacts, and economic feasibility for four types of renewable energy carriers, for three different types of ships.

The energy carriers examined included electricity via batteries, and three electrofuels: hydrogen, methanol, and ammonia.

The energy carriers were in turn used in combination with both engines and fuel cells.

The study shows that ammonia and methanol have the lowest cost of the alternatives studied.

Fayas Malik Kanchiralla commented, “The market is usually drawn by costs, and since electro-ammonia has the lowest cost, the market is aiming towards it. There is a hype around this fuel in shipping today. But if, and when, we make a shift to ammonia, it is to solve the problem of using fossil fuels, and at the moment it seems like we might end up creating more problems instead.”

This is because ammonia comes with a set of environmental disadvantages.

Its use as a fuel can affect air and water quality due to ammonia leakage and emissions of nitrogen oxides (NOx), such as laughing gas (N2O). Fayas Malik Kanchiralla and his colleagues stress the importance of controlling this for ships operating in areas with emission controls, for example a sensitive marine area such as the Baltic Sea.

Electrofuels are synthetic fuels that are produced with electricity, in a process where energy-rich molecules are made from other molecules. These fuels are defined as ‘green’ when they are produced with renewable electricity.

But the study shows that all three green electrofuels have a higher environmental impact than traditional fuels in terms of human toxicity, use of resources such as minerals and metals, and water use.

Eutrophication and acidification are some of the risks

 The use of ammonia is associated with substantial toxicity challenges and risks, which are manageable, but would increase the complexity of the safety systems required.

This would potentially limit the use of the fuel to only deep-sea cargo ships.

“Among the environmental problems that can be traced to use of ammonia are eutrophication and acidification,” noted Fayas Malik Kanchiralla.

“To sum up; even though green ammonia is a fossil-free and relatively clean fuel, it is probably not green enough for the environment as a whole. More risk assessments on the emissions of ammonia, and the related nitrogen compounds, need to be done before adopting this fuel for shipping.”

The study also shows that it is very difficult to find a simple non-fossil fuel solution that both works for all types of ships and is able to meet the goal of reducing greenhouse gas emissions in shipping.


Assessing the environmental and economic aspects of different fuel options for the shipping sector is complex, and several factors need to be considered when developing climate strategies for various types of ships and modes of operation.

“From a life cycle perspective, one needs to find different types of solutions for decarbonisation for different kinds of ships,” said Fayas Malik Kanchiralla. “There is no silver bullet. More research and more life cycle analyses need to be done.”


Kanchiralla said it very factually. “There is no silver bullet.” And the assessment “More research and more life cycle analyses need to be done,” may be a bit understated.

There are going to be tradeoffs when the pressure comes to politicize the fuel and energy issues of a modern economy to satisfy the whole of the interested parties. The risk exists to make immense mistakes that are far worse than the starting problem.

Beware the squeaking wheel of special interests. Better to look for hard facts duly researched and replicated such to be as close to 100% certainty as possible. Even then mistakes can be made. Just because a party is interested doesn’t mean it has a credible interest vs other parties.

The challenge will be to correct the mistakes before they are heavily invested or market dominate.

By Brian Westenhaus via New Energy and Fuel

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