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Retrofitting can reduce CO2 emissions significantly

MAN Energy Solutions is implementing retrofitting technology to convert ship and power plant engines into future-ready machines capable of running on synthetic fuels – gaseous or liquid. Upgrade solutions and advanced customized retrofits by MAN PrimeServ open a world of options. They help you optimize reliability, efficiency, and performance; they lower maintenance expenses and add operational flexibility. More importantly, they enable you to comply with increasing environmental regulations. Retrofitting an engine extends the life cycle substantially, thus abating up to 97% of CO2 compared to e.g., building a new ship.

Our retrofit solutions reduce GHG emissions by up to 20 percent
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Potential in savings of CO2 emissions
Engines have a potential for a future fuel retrofit

Keep your engines, systems, and equipment compliant and competitive 

Cargo ships and power plants are long-term investments. Retrofitted and modernized with high-value MAN Energy Solutions’ products, they become more sustainable, can continue to be used for decades, and are an attractive investment proposition.

Retrofits play an important role in the energy transition and are crucial for achieving a green fleet of ships or power plants that help to meet the targets of the Paris Agreement.

A recent study indicates that around 1,900 two-stroke and 1,800 four-stroke marine and power plant engines have the potential for a future fuels retrofit.

Maximize savings with future fuels through cutting-edge retrofit solutions 

Switching between different fuels is made easy with MAN dual fuel engines, as they are highly versatile and capable of utilizing both liquid and gaseous fuels. This flexibility empowers you to transition between fuels at your convenience, whether driven by factors like fuel costs or regulatory requirements. What's more, these engines can seamlessly switch between fuels even while operating, all without compromising engine performance. Should you wish to convert single fuel engines to dual fuel, please note that such a transformation may necessitate adjustments to your fuel supply infrastructure. Our team of MAN PrimeServ fuel experts is readily available to provide guidance and discuss the various possibilities. 

Converting existing engines to dual-fuel operation is crucial to decarbonize shipping because it’s a powerful measure that can be implemented quickly. This is an essential first step, as all such dual-fuel engines can also be enabled to operate on a range of carbon-neutral synthetic fuels, including synthetic natural gas (SNG), green ammonia and methanol. And from an economic perspective, retrofitting is much more efficient than installing a new engine or building a new ship 

Unlocking efficiency and cost savings 

Our retrofit solutions, upgrades, and services optimize investment returns. They boost efficiency as well as performance, and reduce maintenance, fuel, and lube oil costs. 

Experts in retrofitting and dual-fuel conversions

At MAN Energy Solutions, we have a long-standing experience in retrofitting engines with state-of-the-art technology. We have also pioneered the conversion of large container ships to LNG operation, for example for Hapag-Lloyd, and are currently converting engines on board of a Karadeniz Powership from heavy-fuel-oil to dual-fuel operation.

Finding the perfect fit

Beside methanole, other fuels can also be a solution for your marine application: LNG, bio fuels or amminia. Find your perfect fit now.

News about our retrofit solutions

Thursday, March 16, 2023

Matson Takes Up Option for ME-GI Retrofit

Increasing trend of shipowners choosing dual-fuel retrofits

Matson Navigation Company has confirmed that it will convert the main engine aboard its container ship, ‘Kaimana Hila’, from an MAN B&W S90ME-C10.5 unit to a dual-fuel ME-GI unit capable of running on LNG. In doing so, it is exercising an option contained in a contract it signed with MAN Energy Solutions in June 2022 to perform an identical conversion on a sister ship, the ‘Daniel K. Inouye’. The Kaimana Hila was built in 2019 and MAN Energy Solutions’ after-sales division, MAN PrimeServ, will perform the 3,600 teu vessel’s retrofit.

Klaus Rasmussen, Head of Projects and PVU Sales, MAN PrimeServ, said: “This order is the latest example in an increasing trend of owners choosing dual-fuel retrofits for their existing vessels in service to achieve fleet-transformation goals while simultaneously gaining benefits in terms of upcoming regulations such as CII and EEXI. Retrofitting an MAN B&W engine to dual-fuel running is straightforward as our standard, electronically-controlled diesel engines are constructed as ‘dual-fuel ready’ and therefore readily retrofittable. Such retrofits offer a viable pathway to shipowners that wish to achieve a net-zero carbon footprint by 2050.”

“This will be the third vessel Matson is retrofitting with dual-fuel LNG capability. Each retrofit is a meaningful step toward achieving our corporate  sustainability goals to achieve a 40% reduction in Scope 1 greenhouse gas fleet emissions by 2030 and net-zero Scope 1 GHG emissions by 2050,” said Capt. Jack Sullivan, Matson’s Senior Vice President, Vessel Operations & Engineering.

The option take-up comes on the heels of the recent announcement by Matson of  the construction of three LNG-powered newbuilds that will also be driven by ME-GI engines.

Dual-Fuel retrofits – a valid decarbonisation pathway


MAN Energy Solutions continually develops class-leading technologies that enable customers to meet environmental and commercial goals, as well as today and tomorrow’s regulatory standards. Since the first two-stroke ME-GI (LNG) retrofit in 2015, the company has built an impressive list of references and expanded its portfolio of dual-fuel retrofits to also include fuels like LPG and methanol.

Retrofitting a dual-fuel engine is one of the most effective ways to derive greater efficiency and profitability from a shipping fleet. As such, a dual-fuel conversion delivers the fuel flexibility to take advantage of optimal fuel prices; it can also help vessels comply with IMO emission targets and extend their operational lifetimes to bring a greater return on investments.

About Matson

Founded in 1882, Matson (NYSE: MATX) is a leading provider of ocean transportation and logistics services.  Matson provides a vital lifeline of ocean freight transportation services to the domestic non-contiguous economies of Hawaii, Alaska, and Guam, and to other island economies in Micronesia. Matson also operates premium, expedited services from China to Long Beach, California, provides service to Okinawa, Japan and various islands in the South Pacific, and operates an international export service from Dutch Harbor to Asia. The Company's fleet of owned and chartered vessels includes containerships, combination container and roll-on/roll-off ships and custom-designed barges.  Matson Logistics, established in 1987, extends the geographic reach of Matson’s transportation network throughout North America and Asia. Its integrated, asset-light logistics services include rail intermodal, highway brokerage, warehousing, freight consolidation, supply chain management, and freight forwarding to Alaska.  Additional information about the Company is available at


  • PR Matson ME-GI Option_EN
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Nils Søholt

Trade Press Marine

Group Communications & MarktingMAN Energy SolutionsTeglholmsgade 412450 Copenhagen SVDenmark

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Frequently Asked Questions

Can I retrofit older vessels, or are retrofits primarily for newer ships?

Retrofits benefit vessels of all ages, not just newer ones. It extends the operational life of vessels and ensures compliance with evolving industry as well as environmental standards. Retrofit options depend on the vessel's age, condition, and design, but older ships can benefit from retrofits as well.

What are the environmental and regulatory benefits of upgrading to cleaner technologies in marine applications?

Upgrading to cleaner technologies in marine applications provides numerous environmental and regulatory benefits. This includes significant reductions in emissions of air pollutants, compliance with international regulations, improved fuel efficiency, and noise reduction. Moreover, cleaner technologies enhance safety, contribute to long-term sustainability by reducing carbon emissions, and open access to environmentally conscious markets.

What is the expected downtime during a retrofit or upgrade project?

The expected downtime during a retrofit or upgrade project varies significantly based on factors like the project’s size, customization, location, regulatory requirements, and unforeseen issues. Downtime can range from a few weeks to several months. Efficient project planning can help reduce downtime, while unforeseen problems may extend it. The goal is to strike a balance between minimizing downtime and ensuring high-quality and safe work.

Strategic expertise for global sustainability

Apart from retrofit solutions, as an integral component of our future technology portfolio, we also provide enduring core products and digitalization services. With our extensive expertise in these domains, we are mapping out the path towards a sustainable future.