Technology group Wärtsilä will supply the engines for a new 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 Switzerland-based offshore contractor Allseas Group at the Guangzhou Shipyard International (GSI) facilities in China. The engine order was booked by Wärtsilä in Q4 2025.
The future-proof Wärtsilä 31 engine was selected 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,” says Sytske de Groot, Manager, Naval Architecture – Allseas.
The vessel will operate with four Wärtsilä 31 engines, each fitted with a Wärtsilä NOx Reducer for emissions abatement. Delivery 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,” comments Stefan Nysjö, Vice President, Power Supply, Wärtsilä Marine.
Wärtsilä has already supplied equipment to a number of vessels for Allseas, including the engines for Allseas’ purpose-built cargo barge, ‘Braveheart’.
Media contact for more information on this release:
Isabella Alder
Positioning and Strategic Communications Manager Wärtsilä Marine
Tel: +44 (0) 7792 681 757
marine.media@wartsila.com
Image caption: Wärtsilä will supply the engines for Allseas’ new semi-submersible Heavy Transport Vessel, built to deliver lower emissions and greater fuel efficiency. © Allseas
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Wärtsilä Marine in brief
Wärtsilä Marine is a global pioneer in power, propulsion and lifecycle solutions for the marine market. We develop industry-leading technologies, advancing maritime's transition to new fuels. We support building an end-to-end digital ecosystem where all vessels and ports are connected. Ultimately, Wärtsilä Marine is driving the shipping industry forward on its journey towards a decarbonised and sustainable future through our broad portfolio of engines, propulsion systems, hybrid technology, exhaust treatment, shaft line solutions and digital technologies, as well as integrated powertrain systems. Our offering, which is underpinned by our performance-based agreements, upgrades, lifecycle solutions, decarbonisation services, as well as an unrivalled global network of maritime expertise, delivers the efficiency, reliability, safety, and environmental performance needed to support a safe and sustainable future for our customers, our communities and our planet.
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Wärtsilä in brief
Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets. We emphasise innovation in sustainable technology and services to help our customers continuously improve their environmental and economic performance. Our dedicated and passionate team of 18,300 professionals in more than 230 locations in 77 countries is shaping the decarbonisation of our industries across the globe. In 2024, Wärtsilä’s net sales totalled EUR 6.4 billion. Wärtsilä is listed on Nasdaq Helsinki.
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