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Cost and safety issues are associated with the use of zero carbon ammonia in shipping.

Last month, at one of the largest bulk export ports of the world, in Western Australia's, shippers successfully completed the transfer of ammonia between vessels. This was a crucial test to determine whether it can be used as a marine energy in the drive for cleaner energy.

Ammonia-powered cargo ships are expected to enter service by 2026. This is one of many alternatives that the industry uses to reduce its carbon footprint, which accounts for almost 3% of all global emissions.

Ammonia is a less expensive and safer shipping fuel than other alternatives, like liquefied gas (LNG), biofuels, methanol and methanol.

Ammonia is appealing because it has no carbon and is a fuel that emits zero emissions if it's made with hydrogen generated by renewable electricity.

Safety is a major concern for this product, which is typically used in fertilisers and explosives.

Rio Tinto's head of commercial operations, Laure Baratgin said that the current lack of regulation and experience with ammonia use on ships are major safety deterrents.

Rio, the world's largest iron ore producer, is the main exporter in Dampier where the ammonia trial was conducted. The company operates bulk ships powered by traditional marine fuels or LNG but has not yet ordered or chartered ammonia-fueled vessels.

She said: "We will charter ammonia-dual fuel vessels as soon as we are confident, along with our partners and industry, that risks have been adequately controlled."

Other shippers also hesitate. Only 25 ammonia-dual-fuel ships were ordered globally as of 2024. This is compared to a fleet that includes at least 722 LNG fuelled ships and 62 ships running on methanol as of this year.

Only two ammonia-fueled vessels, including a towboat in Japan, are currently in service.

DANGEROUS PROPERTIES

Ammonia can be a serious problem when refuelling or bunkering ships. It can cause severe poisoning as well as damage to the eyes, skin and respiratory system.

The leakage of fuel tanks and leakage during bunkering are the two biggest risks, according to Yoshikazu Urusitani, General Manager in the Marine Fuel Division at Mitsui OSK Lines.

The Global Centre for Maritime Decarbonisation, (GCMD), conducted a study that identified 400 risks related to ammonia bunkering. These risks can be reduced by using measures like emergency-release couplings which shut down systems when a leak has been detected.

The organisation is preparing a detailed plan of emergency response for ammonia spills. These are more difficult to contain than oil leaks.

"For oil, it's obvious - you can see it. It stays in the water and spreads out. Ammonia, however, dissipates into the air", said Lynn Loo. Chief executive officer at GCMD.

Nippon Yusen Kaisha, a Japanese company that has agreed to build a medium-sized ammonia-fueled gas carrier has developed specific equipment for ammonia bundling.

Takahiro Rokuroda, General Manager of NYK's Next Generation Fuel Business Group, says that the industry must set guidelines to ensure safe fuel management by seafarers.

Singapore, which is the largest ship refuelling centre in the world, has selected companies to investigate the viability and efficiency of ammonia as a fuel for power generation or bunkering. It also plans to develop ammonia bunkering standard.

Costs that are prohibitive

Ammonia bunkering will require a dramatic drop in costs.

Due to the limited supply of ammonia for marine use and its energy density, which is about 2.5 times less than conventional fuel, figures from industry show that powering ships with this fuel can cost up to four times as much.

Loo said that if you want to cover the same distance you will need to either carry twice as much fuel or bunker more often to ensure you have enough fuel.

Wartsila, a manufacturer of engines, says that ammonia fuel also requires extra maintenance because it is corrosive.

The American Bureau of Shipping predicts that ammonia will still account for approximately one-third of all bunker fuel by 2050.

Peninsula's COO, Kenny MacLean said: "We won't release any product until all risks are properly managed."

(source: Reuters)