Finland-headed technology group Wärtsilä Oyj has announced that it will supply the engines for a new Allseas Group purpose-built semi-submersible Heavy Transport Vessel (HTV), which is designed to minimise exhaust emissions and maximise fuel efficiency. The ship is being built for the Switzerland-based offshore contractor at the Guangzhou Shipyard International (GSI) facilities in China.
Allseas selected the future-proof Wärtsilä 31 engine because of its modular design, which enables a significant reduction in maintenance requirements and costs, and its readiness to use alternative sustainable fuels.
This new HTV strengthens the flexibility of our fleet and how we deliver projects. We selected the Wärtsilä 31 engine for its high efficiency, future-ready design, and ability to transition to low- and zero-carbon fuels, which supports both operational adaptability and our long-term sustainability ambitions, said Sytske de Groot, Manager, Naval Architecture – Allseas.
The HTV will operate with four Wärtsilä 31 engines, each fitted with a Wärtsilä NOx Reducer for emissions abatement. Delivery, the value of which has not been disclosed, is scheduled for the first quarter of 2028.
The Wärtsilä 31 engine delivers what the industry needs today and prepares operators for tomorrow. Its exceptional fuel efficiency reduces operating costs immediately, while its capability to convert to sustainable fuels ensures a clear path toward decarbonisation. This makes it one of the most future-ready propulsion solutions available, commented Stefan Nysjö, VP, Power Supply, Wärtsilä Marine.
Wärtsilä has already supplied equipment to several vessels for Allseas, including the engines for its purpose-built cargo barge, ‘Braveheart’.

