Successful Ship-to-Ship Transfer of 23,000 Tons of Liquefied Ammonia Achieved

Advancing the global ammonia supply network through STS technology

22 Sep. 2025

On September 2, a ship-to-ship (STS)* ammonia transfer was executed from the ammonia carrier Berlian Ekuator - owned by NYK and time-chartered by Mitsui & Co., Ltd. - to the ammonia carrier Eco Enchanted, operated by Trammo, Inc., a leading ammonia trader. The transfer was conducted in accordance with stringent safety protocols on the high seas off the coast of Ceuta, Spain.

While NYK has experience with STS transfers involving crude oil, liquefied natural gas (LNG), and liquefied petroleum gas (LPG), this marks our first operation involving liquefied ammonia.

With the support of Trammo's longstanding experience and their designated STS specialist provider, International Fender Providers Ltd.,** we successfully leveraged our advanced safety management system and refined STS operational know-how to safely transfer the entire cargo of liquefied ammonia, approximately 23,000 MT, to Berlian Ekuator.


The ammonia STS operation from Berlian Ekuator (right) to Eco Enchanted.   Image by NYK Group.


STS hose connection.   Image by NYK Group.

Beyond its existing applications in fertilizers and chemicals, ammonia is emerging as a next-generation clean energy source, especially valued for its carbon-free combustion. It is expected to be used in various applications, including marine fuel. With demand expected to increase, the STS method, which is not constrained by port size or onshore equipment, is attracting attention as a flexible supply method compared to conventional land-based cargo handling methods. The success of this operation marks a significant milestone in developing an international supply network for ammonia.

NYK will build on the insights and experience gained from this successful transfer to further advance next-generation fuels and strengthen safe maritime transportation systems, thereby contributing to the broader goal of achieving a decarbonized society.

* A method of directly transferring cargo from one ship to another.
** A specialized company that provides safety management and equipment to support safe STS operations.

NYK Group, press release