Lloyd's List is part of Maritime Intelligence

This site is operated by a business or businesses owned by Maritime Insights & Intelligence Limited, registered in England and Wales with company number 13831625 and address c/o Hackwood Secretaries Limited, One Silk Street, London EC2Y 8HQ, United Kingdom. Lloyd’s List Intelligence is a trading name of Maritime Insights & Intelligence Limited. Lloyd’s is the registered trademark of the Society Incorporated by the Lloyd’s Act 1871 by the name of Lloyd’s.

This copy is for your personal, non-commercial use. For high-quality copies or electronic reprints for distribution to colleagues or customers, please call UK support at +44 (0)20 3377 3996 / APAC support at +65 6508 2430

Printed By


Report casts doubt on CO2 cuts from engine power limits

This spring, the IMO is convening its first major environmental meeting of the the Marine Environment Protection Committee since May 2019. Regulators will need to move forward with some kind of decarbonisation measure. Engine power limits will face scrutiny as this new ICCT questions the validity of this idea

The ICCT takes the view that if engine power limitations are to have a meaningful contribution to cutting CO2 then they would have to be aggressive. It would make no sense to cut engine power by small amounts

ENGINE power limitations on ships would likely deliver minimal reductions in carbon emissions unless they are acute, according to new research by the International Council on Clean Transportation.

The new report unveiled by the US-based environmental non-governmental organisations on Tuesday comes just a couple of months before governments and organisations convene to discuss again the potential short-term measures to slash greenhouse gas emissions from ships, during two week-long environmental negotiations in London thart begin in late March.

Engine power limitation is an option that has featured in proposals on these short-term GHG measures that have been under discussion for almost a year. 

But the ICCT’s report suggests EPLs would have to be intense if they were to have a concrete impact in emissions reductions.

“We find that, due to the ongoing prevalence of slow steaming, EPL measures would need to be aggressive in order to contribute to IMO’s climate goals,” the ICCT said.

The means that a 30% engine power limit would yield “negligible cuts” in CO2 for the 2018 fleet, the report warned.

The ICCT said it found that intermediate EPLs of 40% 50% would reduce CO2 emissions between 1% and 4%, depending on ship type and size.

“The most aggressive EPL scenario modelled, 60%, would reduce CO2 fleetwide in 2030 by about 6% if applied only to ships already in service in 2018, and up to triple that amount if also applied to newer ships,” the ICCT said.

ICCT said it assessed the fuel and CO2 savings of 10% to 60% EPL strategies in 2018 and 2030 for container ships, bulk carriers, and oil tankers, which collectively accounted for more than half of the CO2 emissions from international shipping in 2015.

The results vary based on the ship type and size. For example, containerships above 14,500 teu showed a 15.3% reduction in CO2 emissions under a 60% EPL scenario, while those between 12,000 teu and 14,500 teu showed a 7.7% emissions cut. On the other hand, bulk carriers of 200,000 dwt and above with the same EPL rate recorded a 12.1% reduction.

While mandatory speed limits faced opposition at the IMO last year, EPLs have had important backers. BIMCO has previously proposed curbing power to reduce emissions, while EPLs are one of the options shipowners could use to meet a proposal by Japan that would impose energy efficiency requirements on the existing fleet, known as EEXI.

The ICCT believes EPLs are likely the easiest way for older ships to meet Japan's EEXI requirements “because it requires minimal changes to the ship and does not change the underlying performance of the engine”.

Engine power limitation, as well as other potential short-term measures, are primarily geared towards fulfilling the more immediate of the IMO targets; reducing the carbon intensity of the global fleet by at least 40% by 2030 compared with 2008.

The ICCT has previously calculated that when the IMO set that target in 2018, the global fleet had already achieved an estimated 30% reduction compared with 2008 due to “widespread slow steaming by ship operators”.

The IMO will revise its intitial GHG strategy, including the specific emissions targets, in 2023.

Related Content





Ask The Analyst

Please Note: You can also Click below Link for Ask the Analyst
Ask The Analyst

Your question has been successfully sent to the email address below and we will get back as soon as possible. my@email.address.

All fields are required.

Please make sure all fields are completed.

Please make sure you have filled out all fields

Please make sure you have filled out all fields

Please enter a valid e-mail address

Please enter a valid Phone Number

Ask your question to our analysts