Norwegian study draws new conclusions on reducing emissions
The analysis, titled Energy Transition in Shipping – Facts and Timeline, therefore concludes that most ships in major shipping markets need to adopt operational and technical measures as the most viable path to reduce emissions over the next three to five years. years.
Funded by the Oslo Maritime Foundation and the Oslo Shipowners Association, the study also reveals that ships in all three categories over 5,000 dwt account for around 80% of the greenhouse gases emitted by the world fleet. of approximately 94,000 ships. About one-fifth of this fleet consumes nearly two-thirds of all fuel used in shipping, the analysis notes.
Many ship operators considering engine power limitation as a compliance strategy to meet impending IMO regulations from next January will appreciate the finding that slowing ship speeds “is the most powerful way to reduce emissions. The analysis, by Svein Helge Guldteig of Ocean Consulting AS, estimates that a 10% speed reduction for a typical merchant vessel can typically reduce emissions by 27%. A 20% reduction from 15 to 12 knots could reduce fuel consumption by 50%.
Biofuels or alternative e-fuels offer another operational measure, the report says. Modification and optimization of the hull and propulsion systems, energy saving devices and readjustment of the main engine for lower load optimization are other possible strategies. At the same time, digitization can play an important role in supporting operational measures and achieving optimization savings that were not possible just a few years ago.
Investment risk and access to skilled seafarers are two other issues highlighted in the report. “Investing in new build with technology based on rare alternative fuels carries enormous commercial and technological risk,” Guldteig wrote, “even with the multi-fuel engines now becoming available.” With regard to human resources, the report notes that access to competent personnel to operate vessels with more advanced control systems is likely to be another challenge. “Such skills will be in demand and will take time to develop.”
Limited shipyard capacity – both in new builds and in repairs/conversions – is expected to be significant constraints over the period. “The low availability of alternative fuels and the most likely limited shipyard capacity will limit the willingness to adapt quickly for the large vessel shipping segment,” the report said.