The IMarEST delegation to the IMO has set out a NZF solution to unite the industry landscape. Image Credit: IMarEST

• IMarEST submits comparative analysis of all four NZF options to the IMO
• Levy-based framework most likely to deliver 2030 and 2040 emissions checkpoints, analysis finds
• Current-form NZF could offer lowest average abatement cost if biofuel prices stay in check
• Industry consultation on IMO GHG measures open until September 16

The Institute of Marine Engineering, Science and Technology (IMarEST) has submitted a series of papers to the IMO comparing the four proposed Net-Zero Framework (NZF) options side by side for the first time.

The submissions come ahead of the 22nd Intersessional Working Group on GHG Emissions from Ships (ISWG-GHG 22), which meets from September 1-4 as member states work towards agreement on a framework for international shipping.

The analysis evaluates each of the four proposed MARPOL amendment options against the emissions goals of the IMO's 2023 GHG Strategy, and finds a levy-based framework is most likely to deliver the 2030 and 2040 emissions reduction checkpoints.

That option proposes fixed financial penalties for vessels not complying with emissions standards, with subsidies reserved for operators using zero or near-zero emission fuels and technologies.

However, the study also finds that keeping the NZF in its current form could offer the lowest average carbon abatement cost among the pricing-based options, provided significant increases in biofuel prices are avoided before 2038.

The work draws on modelling by University College London's Energy Institute Shipping and Oceans Research Group and the Rocky Mountain Institute.

"This is the first study to model the specifics of all four proposals side-by-side, building on the assumptions and methods used in the IMO's own Comprehensive Impact Assessment of mid-term measures," Dr Tristan Smith, professor of energy and transport at UCL's Energy Institute and head of the IMarEST IMO GHG delegation, said in a statement.

"As negotiations intensify ahead of MEPC 85 at the end of the year, we are hopeful our analysis will help guide IMO member states to a workable solution for the Net-Zero Framework."

The institute has also launched an industry consultation on the effectiveness of current IMO GHG measures, open until September 16 to individuals and organisations with a stake in maritime decarbonisation.

"By bringing together the views of engineers, scientists and technologists, we can help ensure the Institute's contributions at the IMO continue to reflect our sector's expertise and experience," said Alasdair Wishart, director of technical and policy at the IMarEST.