Each vessel will be equipped with two W?rtsil? 32M multi-fuel engines capable now of operating on methanol fuel and with ammonia ready notation. W?rtsil? will also supply the MethanolPac fuel storage, supply and control system, the gearboxes, two controllable pitch propellers (CPP), three bow thrusters, the NACOS navigation system, three W?rtsil? 20 auxiliary engines, and the hybrid electric system consisting of shore power, batteries, shaft generators, converters, transformers as well as the Energy Management System making it all work together.

Each vessel will also benefit from the W?rtsil? Hybrid Solution, optimising the fuel consumption today and allowing for future full green operation. The vessels will also be equipped with W?rtsil? shore power solution enabling carbon-free operations when the vessels are in port.

“We are proud to be supporting these innovative hybrid vessels with our methanol fuelled engines and electrification systems. Both Stena RoRo and W?rtsil? share the same commitment to decarbonising shipping operations, and these vessels represent a further step in this direction by being the first methanol hybrid ships in their class. Not only will the emissions be minimised, but they will also have the most efficient energy utilisation during operations,” commented Roger Holm, President of W?rtsil?’s Marine Power business.

The 147 metre long ships will have 2,800 lane metre capacity and will be able to accommodate a total of 37 passengers and crew. They are scheduled for delivery in June and November 2025. The W?rtsil? equipment will be delivered to the yard in 2024.

W?rtsil? has a strong relationship with Stena RoRo, and as early as 2015 W?rtsil? converted the Stena Germanica to operate on methanol fuel. The two companies are currently cooperating on a number of other Ro-Pax projects.