Tokyo Kisen launches electric tugboat Taiga

On 26 May, Japanese tugboat services provider Tokyo Kisen held a naming and launching ceremony of the electric tugboat Taiga, currently under construction at Kanagawa Dockyard.

The 36-metre-long Taiga is powered by an electric propulsion system that combines large-capacity lithium-ion batteries developed by Japanese shipping consortium e5 Lab and a diesel engine.

It is an eco-ship designed to protect the environment in areas surrounding the ports of Yokohama and Kawasaki, and also a crew-friendly tugboat, not only achieving low/zero emissions of CO2, NOx, SOx, and particulate matter (PM) from the vessel but also reducing noise and vibration for an improved working environment.

IHI Power Systems participated in the development of the tugboat as the system integrator and supplier of the ship’s electric propulsion system. The Taiga is the first tugboat to adopt IHI Power Systems’ L-Drive propulsion system. The system also marks the first use of ABB’s DC Grid in Japan.

In combination with the large-capacity lithium-ion batteries, it delivers higher efficiency than conventional electric propulsion systems. In addition, it can be upgraded for even greater energy efficiency by analyzing important parameters such as the charge-discharge power of lithium-ion batteries and propulsion motor output, along with the fuel consumption of the diesel engine.

The project team also collaborated with OSD-IMT, a group company of Dutch Damen Shipyards, for the concept design of the tugboat to improve the crew’s operating performance as well as living environment.

In recognition of these advancements, the tugboat construction project was adopted as a subsidy project by Japan’s Ministry of Economy, Trade and Industry (METI) and Agency for Natural Resources and Energy.

Initially, the team considered equipping the tugboat with hydrogen fuel cells for enhanced environmental performance, and conducted a risk assessment in cooperation with the project partners, but decided not to adopt the cells.

The Taiga is slated for completion in December 2022, and will operate mainly in the ports of Yokohama and Kawasaki as a harbor tug after delivery. In addition, the installation of power supply equipment on a floating pier designed especially for the Taiga will be completed when the tug enters service.

The Taiga is the second eco tugboat, following the Ginga, a diesel-electric hybrid harbor tug that was launched in the ports of Yokohama and Kawasaki in 2013.

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