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Tue 9 Dec 2025, 06:50 GMT | Updated: Tue 9 Dec 2025, 08:08 GMT | Evangelia Fragouli

Imabari delivers 13,900-teu container ship with future-fuel readiness


Japanese shipbuilder hands over One Synergy with methanol and ammonia conversion designs approved.

One Synergy vessel.
One Synergy achieves 60% reduction in emissions index while maintaining readiness for future alternative fuel conversion. Pictured: The One Synergy, a 13,900-teu container ship, delivered on 21 November. Image credit: Imabari Shipbuilding

Imabari Shipbuilding has delivered the 13,900-teu container ship One Synergy from its Hiroshima Works facility on 21 November, according to the company.

Purpose-built for Ocean Network Express (ONE), the ship has a carrying capacity of 13,932 TEU and is equipped with up to four lashing bridges on deck. The vessel can carry a large number of refrigerated containers in the holds and on deck, and is certified to transport various dangerous goods in compliance with the International Maritime Dangerous Goods (IMDG) Code.

Imabari Shipbuilding said the hull was optimised using advanced analytical technologies based on the ship’s typical operating speeds and draft conditions. Combined with energy-saving devices, a twist rudder, and a friction-reducing hull coating, the design is said to deliver a significant boost in fuel efficiency.

Based on the above modifications, the vessel’s Energy Efficiency Design Index (EEDI) has been reduced by approximately 60% from the regulatory standard, substantially exceeding the latest requirements. A bow wind cover was also fitted to improve real-world performance.

In addition, to meet emissions regulations, One Synergy is equipped with a hybrid exhaust gas cleaning system (EGCS) to control sulphur oxide emissions and an exhaust gas recirculation system (EGR) to reduce nitrogen oxides. Moreover, the ship features a ballast water treatment system and maintains an inventory list aligned with the Ship Recycling Convention.

Looking toward future decarbonisation pathways, Imabari has completed concept designs for potential conversion to methanol and ammonia fuel, as well as for the installation of CO₂ capture systems. These concepts have received Approval in Principle (AiP) from Lloyd’s Register.

The vessel measures 335.94 metres in length overall, with a 51-metre beam and 30.10-metre depth. It has a gross tonnage of 140,233 and is powered by a 7G95ME-C10.6 main engine, giving it a service speed of approximately 22 knots.

One Synergy is classed by Lloyd’s Register and sails under the Singapore flag.


Ammonia   Container ship   Design   Lloyd's Register   Methanol   Newbuild   Vessel delivery   Japan  Singapore 
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