Kawasaki Delivers World’s First Gas Engine Hybrid Propulsion System for Use on a Bulk Carrier

Dec. 26, 2023

Tokyo, December 26, 2023 — Kawasaki Heavy Industries, Ltd. announced today the delivery of a gas engine hybrid propulsion system that combines a natural-gas engine and large-capacity batteries. It is for, use on a bulk carrier operated by NS United Naiko Kaiun Kaisha, Ltd. This is the world’s first delivery of a hybrid propulsion system for a bulk carrier that utilizes a gas engine as the main means of propulsion.

By using a pure gas engine fueled only by natural gas as the main propulsion, the system cuts down CO2 emissions during operation by approximately 24 percent compared with a conventional heavy-fuel-oil engine used in the same vessel type. It also achieves significant reductions in sulfur oxide (SOx) and nitrogen oxide (NOx). In addition, the system can operate in electric propulsion mode using the batteries when entering and leaving port to achieve navigation with zero greenhouse gas emissions.

In order to mitigate global warming, the International Maritime Organization (IMO) has been strengthening exhaust gas regulations for CO2 , NOx and other emission types in the area of marine transport. As a marine propulsion system integrator, Kawasaki will continue to provide propulsion systems with excellent environmental performance achieved through optimized combinations of gas engines, propellers and other core components in order to reduce environmental impact in the marine shipping industry.

Bulk carrier (limestone carrier)

Deadweight tonnage (DWT)Approx. 5,549 
Size (m)Length overall: 94
Molded breadth: 18.2
Molded depth: 9.9
Main routeShiriya Misaki Port to Muroran Port

Gas engine hybrid propulsion system


Construction of the ship was carried out as part of the Project for Promoting Introduction of Advanced Technology for Simultaneous Realization of Social Change and Decarbonization of Logistics (Project for Promoting Introduction of LNG Fuel System, etc.) under the FY2021 Subsidies for Business Expenses for Reducing Carbon Dioxide Emissions, which is a project carried out by the Ministry of the Environment’s Global Environment Bureau and the Ministry of Land, Infrastructure, Transport and Tourism’s Maritime Bureau.

Relevant links

Construction of a Coastal Limestone Carrier with a Hybrid Propulsion System using a Gas-Only Engine and a Battery (September 30, 2021)


Green Gas Engine for marine


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