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Exclusive: Anemoi lays out financial and environmental benefits of Rotor Sails

UK-based Anemoi shared with Manifold Times financial benefits from reduced bunker fuel consumption when utilising wind-propulsion technology and its long-term environmental benefits.

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Exclusive: Anemoi lays out financial and environmental benefits of Rotor Sails

Anemoi Marine Technologies, a UK-based Rotor Sail developer, wrote an exclusive editorial contribution for Singapore-based bunkering publication Manifold Times exploring the financial benefits from reduced bunker fuel consumption when utilising wind-propulsion technology while also highlighting the long-term environmental benefits of the technology for ship owners: 

As the global shipping industry ramps up decarbonisation efforts, modern cargo vessels are striving for energy efficiency, guided by the International Maritime Organization’s (IMO) regulations.  The IMO’s 80th meeting of its Marine Environmental Protection Committee (MEPC 80), which took place in July 2023, spotlighted vessel efficiency, emphasizing a review of energy efficiency design requirements, including the Carbon Intensity Indicator (CII) and the Energy Efficiency Existing Ship Index (EEXI).

In pursuit of the IMO’s net-zero target of 2050, ship owners are embracing low and zero-carbon technologies. Among these, innovative propulsion options like Flettner Rotors, or Rotor Sails, are gaining traction. These advanced sails, inspired by history but technologically superior, offer auxiliary propulsion to vessels to enable them to maintain their speed but with reduced fuel usage, which can in turn significantly reduce carbon emissions.

Rotor Sails are particularly popular for their retrofitting potential, allowing easy installation on existing vessels in port or dry dock.  With wind power abundant on many trade routes, ship owners are embracing these modern solutions to drive efficiency and cut emissions.

Simplicity

Rotor Sails are genius in their ingenuity. They harness the “Magnus Effect”, rotating within airflow to produce forward thrust perpendicular to the wind. This additional thrust can enhance speed or reduce engine power, dramatically cutting fuel consumption and emissions. Versatile and simple to install, they are suitable for various vessel types. Each sail can be swiftly fitted, even during dry dock or while berthed, making them ideal for rapid retrofits. Moreover, they are portable assets, and can be transferred between ships as required. With their uncomplicated design and swift installation, Rotor Sails offer a rapid and efficient solution for reducing emissions and enhancing efficiency in the maritime sector.

Rotor Sail placement and design on vessels must carefully consider safety and efficiency, ensuring no hindrance to cargo handling. Anemoi Marine Technologies, a leading developer based in the United Kingdom and with a world-class production facility in China, retrofitted three 24-m Rotor Sails on the Kamsarmax bulk carrier TR Lady in June 2023 at Chengxi Shipyard in China. Despite the challenge larger bulkers face in meeting efficiency targets, Rotor Sail technology is ideal due to their ample deck space and predictable wind patterns.

Exclusive: Anemoi lays out financial and environmental benefits of Rotor Sails

TR Lady‘s trial voyage from China to Australia yielded positive results and annual savings of 10% in fuel consumption and emissions are expected. The sails, which are installed on Anemoi’s transverse rail deployment system, can be moved on the deck when berthed for cargo operations.

Anemoi’s Chief Executive Officer, Kim Diederichsen, highlighted the effectiveness and cost efficiency of the technology in reducing emissions: “The installation of Rotor Sails on TR Lady and the results we have seen so far show how effective Rotor Sails are when it comes to reducing the fuel consumption and emissions of a vessel. Rotor Sails are a visible, viable and cost-effective decarbonisation technology.”

Diederichsen went on to say: “Our background equipped us with the knowledge of how to best adapt the technology for complex vessel operations. As a result, we developed a range of Rotor Sails with variable heights and, most uniquely, a range of deployment systems and mounting arrangements. This includes a standard fixed mounting; a folding deployment, which enables the cylinders to be lowered from vertical to enable the vessel to pass under low bridges and avoid impact to cargo loading and unloading; and finally our patented rail system that was used on TR Lady.”

Their technology, adapted for complex vessel operations, includes variable heights and deployment systems like folding and patented rail systems, ensuring adaptability and minimal impact on cargo operations.

Anemoi developed a Fuel Saving Assessment Model (FSAM) to accurately predict fuel and emissions savings. FSAM utilizes Rotor Sail performance, vessel data, route, and wind conditions to simulate historic voyages over five years, ensuring fair and transparent results accounting for additional drag and generator usage.

Forward Thinking

Anemoi already has a number of projects underway with some of the industry’s biggest names, including Vale and Berge Bulk to install Rotor Sails onboard vessels over the coming months and, in February, it received funding from the UK’s Clean Maritime Demonstration Competition to develop a new diameter of Rotor Sail and innovative drive system. Buoyed by its success on bulk carriers, Anemoi has also signed a deal with Hudong-Zhonghua Shipbuilding Group to develop Rotor Sail designs specifically for LNG vessels.

As per the UK’s Clean Maritime Plan, the wind propulsion technology market, including Rotor Sails, is expected to soar to GBP 2 billion (USD 2.5 billion) annually by 2050, a substantial rise from the projected GBP 300 million in the 2020s.

This growth is directly tied to the credibility of Rotor Sails as a decarbonisation technology.  As alternative fuels and other eco-friendly innovations become market-ready, auxiliary wind propulsion methods can be used in tandem to garner even more environmental benefits for the shipping sector.

 

Photo credit: Anemoi Marine Technologies
Published: 16 May, 2024

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Events

London forum to address critical bottlenecks holding back maritime decarbonisation

Marine Energy Transition Forum 2026 will be held on 11 November to address bunker fuel, technology and infrastructure barriers that continue to slow the industry’s transition to net-zero emissions.

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London forum to address critical bottlenecks holding back maritime decarbonisation

The Marine Energy Transition Forum (METF) 2026 will bring together leading voices from across the global maritime sector on 11 November 2026 at Norton Rose Fulbright, London.

The forum will tackle one of shipping’s most pressing challenges: how to overcome the fuel, technology and infrastructure barriers that continue to slow the industry’s transition to net-zero emissions.

Under the theme “Reframing the maritime decarbonisation roadmap: addressing fuel, technology and infrastructure bottlenecks,” the one-day forum will provide a platform for shipowners, fuel suppliers, technology developers, ports, policymakers and financiers to examine the practical steps needed to accelerate progress while maintaining commercial competitiveness.

As the maritime industry navigates an increasingly complex regulatory and commercial landscape, METF 2026 will focus on delivering practical insight into the challenges—and opportunities—shaping the next phase of the energy transition.

The conference programme will explore five key themes:

  • The effectiveness of current regulatory frameworks and policy measures, including regional and international initiatives driving maritime decarbonisation.
  • Progress in developing a resilient multi-fuel future, examining investment, fuel availability, supply chains and infrastructure.
  • The commercial readiness of emerging technologies, including alternative propulsion systems, vessel optimisation, batteries, carbon capture, wind propulsion and digital solutions.
  • Building a supportive business environment for energy transition companies, with discussions covering finance, innovation, scaling businesses and market development.
  • The evolving role of ports as critical enablers of shipping’s energy transition through new fuel infrastructure, shore power and energy cluster development.

METF 2026 is designed to encourage open discussion between every part of the maritime value chain, recognising that collaboration across fuel producers, shipowners, ports, technology providers, investors and policymakers will be essential if global decarbonisation ambitions are to be achieved.

The event will feature expert speakers, panel discussions and extensive networking opportunities, enabling delegates to exchange ideas, develop partnerships and gain practical insight into the strategies shaping the future of maritime energy.

Registration for METF 2026 is now open. Further information and registration can be found here

 

Photo credit: ship.energy
Published: 13 August, 2026

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FuelEU

Skuld on FuelEU Maritime: Early lessons from first year of compliance

Joe Bettles of Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping discusses the first FuelEU Maritime compliance results and what they indicate for the shipping industry.

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RESIZED Chris Pagan

With the first FuelEU Maritime compliance data emerging after the inaugural year of greenhouse gas (GHG) intensity reporting for ships trading in the EU, marine insurer Skuld spoke with Joe Bettles, Climate Policy Manager and author of the Countdown newsletter at the Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping, to examine what the early results reveal: 

The first data on FuelEU Maritime compliance is now emerging, following the first year of reporting against greenhouse gas (GHG) intensity targets for shipping companies trading in the EU.

To better understand what the early results show, we spoke with Joe Bettles, Climate Policy Manager and author of the Countdown newsletter at the Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping (Center). The Center recently published its analysis of the first reporting year in the article “What did we learn from the first year of FuelEU?”

Under the regulation, shipowners have several options for compliance, including:

  • The pooling mechanism, which allows vessels with a compliance surplus to trade it with other vessels.
  • The borrowing mechanism, which allows companies to defer a compliance deficit to the following year for a 10% surcharge.
  • Meet the target by using low GHG intensity fuels.
  • Pay the FuelEU penalty (penalty).

Pooling becomes the preferred option

The first year of reporting indicates that pooling has quickly become the preferred choice. According to data from the European Commission, 92% of vessels used the pooling mechanism, while only 2% used borrowing. The remaining vessels either paid the penalty or met the target by using LNG or other low-GHG energy sources.

Commenting on the findings, Joe Bettles says: “Our insights from the first year of reporting indicate that shipping companies were able to comply with the targets, with most using the pooling mechanism. This shows that FuelEU is working as intended. As we approach the IMO’s upcoming discussion on the Net-Zero Framework (NZF), FuelEU demonstrates that it is possible for the global fleet to comply with a GHG intensity regulation using existing fuels and providing incentives for the uptake of cleaner energy sources.”

A developing market for compliance surplus

The Center’s article also reviews the different pooling platforms available to shipping companies seeking to meet their obligations under the regulation. The price of compliance surplus, averaging around EUR 208/tCO₂eq, remained relatively stable, suggesting that the market matured early, with buyers generally able to find sellers.

On the development of the pooling market, Joe notes: “The prices for trading compliance surpluses remained well below the EUR 640/tCO₂eq penalty for VLSFO, making the pooling mechanism significantly more attractive than paying the penalty.”

Fuel choices remain central to compliance

The role of fuel choice is also important. Looking at fuels supplied to the FuelEU market, the Center estimates that 3.22 million tCO₂eq of reductions, relative to an all-VLSFO fleet, will be required to meet the 2% reduction target between 2025 and 2029. Based on analysis of previous years’ fuel consumption, the Center indicates that LNG may have contributed around one-third of the required reduction. Biofuel blends account for the remainder, with biodiesel and bio-LNG dominating the low-GHG fuel mix.

Joe highlights how the pooling mechanism can help extend the impact of lower-GHG fuels across the fleet: “Although LNG is not a drop-in replacement for VLSFO, the pooling mechanism under FuelEU allows an LNG-fuelled vessel to share its over-compliance with other vessels that cannot physically use LNG. Depending on the engine type in the ship, LNG can remain compliant with the 14.5% reduction target through 2039 and can further extend its compliance through banked surplus or by using liquified biomethane.”

Three early lessons from FuelEU Maritime

Drawing on the first year of reporting, Joe Bettles and the Center identify three lessons that may also be relevant for the IMO in the future.

First, the results indicate that a fuel standard for shipping can work. FuelEU’s first year has created incentives for the use of alternative fuels and a market for those who prefer to pay for emissions compliance.

Second, regulations should include mechanisms that support a broader mix of energy sources. Lower-maturity alternatives, such as wind-assisted propulsion, e-fuels and onshore power, still represented a limited share of the mix.

Third, policy stability and clear reduction pathways can help reduce uncertainty for shipping companies and support the business case for investment in cleaner alternatives.

Supporting knowledge sharing across the maritime value chain

Skuld is a Mission Ambassador to the Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping, supporting its work as a platform for collaboration, knowledge sharing and practical insight across the maritime value chain.

“The Mærsk Mc-Kinney Møller Center for Zero Carbon Shipping is a highly valuable forum for us at Skuld. It provides access to a broad network of industry stakeholders and helps us stay close to the challenges shipowners face in meeting regulatory requirements and reducing emissions. Just as importantly, it serves as a platform for dialogue and knowledge sharing across the maritime value chain” – Matias Bøe Olsen, Decarbonisation and transition risk lead, Skuld.

Note: Read the full article on FuelEU’s first-year experiences here.

 

Photo credit: Chris Pagan on Unsplash
Published: 7 August, 2026

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Alternative Fuels

BAR Technologies: Shipping must stop waiting for future bunker fuels to decarbonise

‘Shipping needs to stop treating decarbonisation as something that only begins when future fuels arrive or every detail of the IMO’s Net-Zero Framework is settled,’ says John Cooper, CEO of BAR Technologies.

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IMO move signals pivotal regulatory shift on wind propulsion, says BAR Technologies

BAR Technologies on Wednesday (29 July) said while the shipping industry is right to plan for long-term fuel pathways, too much of the decarbonisation debate remains focused on what may become available in the future rather than what can be deployed now.

The company said this in response to a new study by EY Greece warning that shipping’s transition to net zero will be uneven and capital intensive, constrained by factors including alternative fuel availability, infrastructure, shipyard capacity, access to finance and fragmented commercial incentives.

The EY study identifies energy efficiency and operational measures as among the most practical near-term actions available to shipping. BAR Technologies argued that wind propulsion, already delivering measurable fuel and emissions savings on commercial vessels, must be recognised as a proven part of that immediate response.

BAR Technologies said wind propulsion has also passed an important market milestone. 

According to the International Windship Association, more than 100 large commercial cargo ships, representing over five million tonnes of deadweight capacity, are now equipped to harness wind power. That is almost five times the number recorded in May 2022, clear evidence that the technology is moving into the commercial mainstream. 

BAR Technologies are playing a significant part in this transition: By the end of 2026, 10 vessels will be operating with 23 WindWings® installed, giving a combined saving of approximately 100t of CO2 per day.

John Cooper, CEO of BAR Technologies, said: “Shipping needs to stop treating decarbonisation as something that only begins when future fuels arrive or every detail of the IMO’s Net-Zero Framework is settled. The industry cannot allow the absence of perfect policy certainty to become an excuse for inaction. Proven technologies are available now, and owners can act today.”

Unlike alternative fuels, wind requires no new fuel-production facilities, bunkering infrastructure or global supply chain. It is freely available as an energy source and can reduce a vessel’s dependence on whichever fuel it uses.

“Wind propulsion is not waiting to be invented or proven. It is already operating on commercial vessels and reducing the amount of fuel they need. The priority now should be to remove the barriers preventing more owners from investing,” he said. 

For wind propulsion, those barriers are increasingly commercial and financial rather than technical.

Under many chartering arrangements, the owner funds the technology while the charterer receives much of the benefit through lower fuel consumption. Until charterparty structures allow the costs, risks and savings to be shared more effectively, owners can be left carrying the investment and long-term performance risk.

Access to finance is another significant constraint. Without competitive green lending or blended finance, owners may have to fund emissions-reduction technology at conventional commercial borrowing rates. This can lengthen the payback period, particularly in the tramp, bulk and tanker markets, where routes, earnings and charter durations are less predictable.

The EY study concluded that the pace of shipping’s transition will depend on coordination, commercial bankability, access to finance and action across the maritime value chain.

Cooper added: “But the real way to unlock action now is to make green investment affordable. Shipowners need access to financing that makes proven emissions-reduction technologies commercially viable today, not at some point in the future. If we can lower the cost of capital and create funding structures that recognise both the fuel savings and the environmental value these technologies deliver, far more owners will be able to invest.

“Wind propulsion has already passed the technology test. Affordable finance, alongside charterparty structures that share the benefits fairly, is what will unlock deployment at scale.”

 

Photo credit: BAR Technologies
Published: 30 July, 2026

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