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Alibra Shipping: Slow steaming, a solution to reduce CO2 emissions?

Slow steaming can only be transitory, with technology needing catch up with current requirements, explains shipbroker.

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The following blog was written by London-based shipbroking firm Alibra Shipping in early May:

Emissions from shipping have come under fire once again thanks to the recent climate change protests in London and Sweden that have put further pressure on governments to take swift and decisive action on the environment. Although official figures indicate that the UK’s global greenhouse gas emissions have fallen by 44% since 1990, climate change activist Greta Thunberg attacked governments for ‘very creative carbon accounting’ as this figure does not include various emissions categories, one of those being shipping.

A number of proposals have been put forward to the IMO, urging the organisation to implement mandatory speed limits in order to reach the targets to reduce emissions, set out by the EU of 40% by 2030. Later this month the IMO Marine Environmental Protection Committee (MEPC) will get together to discuss possible short-term measures to reduce carbon emissions.

France has proposed speed limits worldwide as a means to cut emissions quickly and effectively, it has also put forward the idea of an annual emissions cap for shipping companies by 2023. Greece has also suggested that speed restrictions would be an effective measure to achieve a reduction in emissions, the concept has been backed by some key industry figures. In fact, earlier this week more than 100 industry leaders sent a letter to the IMO highlighting the urgent need to address global climate change and that mandatory vessel speed limits could help.

Denmark, Germany & Spain have also submitted a joint proposal of a goal-based approach to reducing emissions, that would leave it up to shipowners to decide how they reach these targets but would incentivise operational improvements such as hull cleaning.

With questions surrounding the environmental benefits of scrubbers, slow steaming has been presented as a valuable tool if the IMO is to meet the 2050 goal of a 70% reduction in emissions. With interest surrounding LNG fuelled vessels is slowly growing but many argue that the bunkering system still lacks infrastructure and is therefore not yet a suitable alternative. It is also not clear that if mandatory slow steaming were to be imposed, how speed limits would be managed and policed.

In fact, slow steaming is not a new concept, it has been adopted in the past voluntarily as a tool to reduce operating costs during economic downturns and was popular amongst shipowners and operators in the era of high bunker fuel prices. Studies by the IMO suggest that by simply reducing a ship’s speed by 10%, it’s fuel consumption can be lowered by almost 20%.

Slow steaming also has the added bonus of decreasing capacity which also has the benefit of increasing demand for shipping. Consequently, organisations such as Intercargo have used this theory to put forward the case that although imposed speed restrictions could lower emissions in the short-term, looking ahead it could have the opposite effect and actually cause increase C02 emissions, based on the concept that slow steaming will increase the demand for ships which in turn could lead to new vessels being ordered to meet demand. From a technical standpoint it can also be argued that slow steaming can cause a lack of efficiency plus wear and tear to the engines, therefore not having the desired effect.

Whilst slow steaming may work as an urgent short-term method, it is clear that it can only be transitory and in the long run it is essential that technology catches up with the current requirements, if the shipping industry is to meet IMO targets.

Related: Oko-Institut report finds positive impact on slow steaming for bulkers
RelatedCIMAC: No ‘silver bullet’ in immediate sight to meet GHG reductions
RelatedEU study finds easiest paths in meeting 2030 GHG reduction target
RelatedDecreasing vessel speeds offer ‘false impression’ of GHG reductions
RelatedShipping CEOs agree on mandatory speed measure for vessels

Photo credit and source: Alibra Shipping Ltd
Published: 13 May, 2019

 

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Methanol

GENA Solutions: Total renewable and low-carbon methanol project pipeline increases from 61.8 to 62.2 Mt by 2032

Information shared by MI – the Global Methanol Alliance meant to assist the maritime industry in the adoption of methanol as a mainstream marine fuel heading into IMO 2030/2050.

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MI – the Global Methanol Alliance recently shared with Manifold Times the renewable and low-carbon methanol project pipeline August 2026 release produced by GENA Solutions Oy.

Information from the release is meant to provide the bunkering publication’s readers with insight on renewable methanol availability, and to assist the maritime industry in the adoption of methanol as a mainstream marine fuel heading into IMO 2030/2050.

Key takeaways from GENA’s August 2026 Methanol release are as follows:

  • As of the end of August 2026, GENA tracks 286 renewable and low carbon methanol projects, representing 62.2 Mt of capacity by 2032. This includes 25.1 Mt of e-methanol, 25.9 Mt of biomethanol, and 11.2 Mt of low carbon methanol capacity.
  • Two new projects were added to Project Navigator last month, while one frozen project was excluded. The project pipeline increased by 0.4 Mt month on month.
  • Four new offtake agreements were registered during August, including two biomethanol and two e-methanol agreements.
  • About 8% of the cumulative renewable methanol project pipeline capacity has reached FID so far, with another 11% at the FEED stage.
  • Considering the current uncertainty around regulatory developments and demand growth, GENA projects that renewable methanol capacity could reach 6 Mt to 12 Mt by 2031.

Note: The full article can be viewed here.

Renewable methanol project pipeline 4 Renewable methanol by feedstock 8 Renewable methanol by region 7 Project pipeline by status Methanol capacity scenarios

 

Photo credit: GENA Solutions
Published: 4 September, 2026

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Business

Singapore: MPA urges maritime firms to prepare for potential haze with plan

MPA encourages all maritime companies, especially those with workers performing outdoor work to maintain a business continuity plan for haze.

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The Maritime and Port Authority of Singapore (MPA) on Monday (31 August) issued Port Marine Circular No. 9 of 2026 on steps for maritime companies to take for potential haze affecting Singapore:

BUSINESS CONTINUITY PLAN FOR HAZE

This circular supersedes Port Marine Circular No. 09 of 2023.

With reference to the National Environment Agency’s (NEA) joint media release issued on 9 August 2026, hotspots were observed in parts of Sumatra and Kalimantan, with prevailing winds potentially bringing smoke haze towards Singapore. The dry conditions may further increase the likelihood of haze affecting Singapore. The Maritime and Port Authority of Singapore (MPA) encourages all maritime companies, especially those with workers performing outdoor work to maintain a business continuity plan for haze.

MPA advises all maritime companies to monitor the PSI level through the media and the NEA’s website (www.haze.gov.sg), keep at least a one-week supply of N95 masks for workers especially those who work outdoors, and observe the Ministry of Manpower’s (MOM) Haze guidelines and advisory for work which can be found on their website (www.mom.gov.sg/haze). The latter include guidelines to ensure that stocks of N95 masks are periodically inspected, remain serviceable, and not expired.

The visibility in the Singapore Strait and port waters could be significantly reduced in the event of haze. During periods of restricted visibility, shipmasters are advised to keep a proper lookout and navigate with caution. They are also advised to comply with the International Regulations for Preventing Collisions at Sea and in particular Rule No. 19, Rule No. 20 and Rule 35 concerning conduct of vessels in restricted visibility, exhibition of navigation lights and sound signals in restricted visibility, respectively.

In the interest of safety of navigation and life at sea, the Port Master may restrict the movement of harbour craft and pleasure craft in the port waters during reduced visibility conditions.

 

Photo credit: Manifold Times
Published: 31 August, 2026

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Alternative Fuels

DNV report: Regulatory uncertainty demands fleet strategies built for multiple futures

Report examines four regulatory scenarios, ranging from adoption of IMO NZF in its current form to its outright rejection, energy efficiency uptake, and long-term bunker fuel and technology strategies.

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DNV report: Regulatory uncertainty demands fleet strategies built for multiple futures

Regulatory uncertainty is increasing pressure on shipowners to make investment decisions that remain viable across multiple future scenarios, said classification society DNV on Thursday (27 August). 

According to DNV’s 10th Maritime Forecast to 2050, stronger global regulatory signals could accelerate the uptake of energy-efficiency measures, enabling the global fleet to consume up to 25% less energy by 2050 compared to a scenario where regulation is driven by regions.

The report examines four regulatory scenarios, ranging from adoption of the IMO Net-Zero Framework (NZF) in its current form to its outright rejection, which could lead to a period of prolonged regulatory gridlock, and explores the implications of these outcomes for fuel demand, energy efficiency uptake, and long-term fleet fuel and technology strategies.

Cristina Saenz de Santa Maria, CEO Maritime, DNV, said: “Ships ordered today will operate well beyond 2050, but many of the factors shaping their future performance remain uncertain. Regulatory requirements are advancing faster than the fuel, infrastructure, and technological systems needed to support them, making long-term investment decisions increasingly complex. The industry therefore needs greater clarity and alignment among all stakeholders to provide the confidence required for long-term investment. In the meantime, shipowners need strategies that deliver benefits today while remaining resilient across a range of regulatory and market outcomes.”

Energy efficiency is one of the most immediate and practical levers available to shipowners, delivering value across regulatory outcomes whether implemented at the newbuild stage or as a retrofit. A case study of a hydrodynamic measures retrofit on a 5,000 TEU container vessel showed potential annual fuel savings of 16%, with a payback time of around one to four years depending on future fuel prices. Retrofits can add similar value across many ship types and with sufficient planning can typically be completed during a standard class-renewal dry docking.

The development of the marine low-GHG fuel market remains a key challenge. While significant progress has been made in expanding alternative-fuel capabilities of vessels, scaling fuel production depends on confidence that demand will materialize. DNV projects shipping demand for low-GHG fuels to range from 4 to 22 Mtoe by 2030 and 33 to 185 Mtoe by 2050, depending on regulatory outcomes, with uptake also shaped by future uptake of shore power, plug-in hybridization, nuclear power, and onboard carbon capture systems.

Current project pipelines indicate a maximum global supply of 270 Mtoe by 2030, although actual volumes are likely to be lower due to project delays and other uncertainties, and shipping will need to compete with other industries for its share. However, the cost of reducing emissions varies significantly between fuel pathways, with abatement costs ranging from about 180 to 1,290 USD per tonne of CO₂ avoided, highlighting the importance of regulation and market incentives in enabling low-GHG fuel markets to develop.

Øyvind Sekkesæter, lead author of Maritime Forecast to 2050, said: “Scenarios explored in this year’s report show how different regulatory futures can lead to very different outcomes in energy efficiency uptake, fuel demand, and consequently, GHG emissions. By testing fuel and technology choices across multiple scenarios, shipowners can identify strategies that create value today while preserving flexibility as regulation, fuel availability, prices, and technologies evolve. Strategies that each owner chooses will also be dependent on their fleet type and operating context.”

Key findings from the report: 

  • Several regulatory futures remain possible as the IMO continues negotiations on the Net-Zero Framework, with these outcomes shaping investment decisions, low-GHG fuel uptake, and energy-efficiency deployment across the global fleet.
  • With global regulatory incentives in place, the world-fleet could consume 25% less energy by 2050 than under a scenario limited to regional regulations.
  • Energy efficiency can pay off regardless of regulatory outcome – 5,000 TEU container ship case study shows 16% annual fuel savings from hydrodynamic measures retrofit.
  • Shipping demand for low-GHG fuels could range from 4 to 22 Mtoe by 2030, and 33 to 185 Mtoe by 2050, depending on regulatory outcomes and the availability of these fuels in a competitive global market.
  • Current project pipelines indicate that a maximum of 270 Mtoe of supply could be available by 2030, though actual volumes are likely to be lower due to project delays and other uncertainties, and shipping will need to compete with other industries for its share.
  • Testing fuel and technology strategies across different scenarios can help shipowners identify robust choices for an uncertain transition. Testing, piloting, and verifying technologies can provide the trusted performance data needed to make investment decisions with greater confidence.

Note: DNV’s 10th Maritime Forecast to 2050 can be found here. 

 

Photo credit: DNV
Published: 28 August, 2026

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