Potential Emissions Reduction from EEXI

What potential emissions reduction result from EEXI and how much the new measures will affect the speed and power of vessels?

The Helsinki-based maritime data analysis provider NAPA conducted a new study on the potential emissions reduction of the upcoming measures. Hence, the Energy Efficiency Existing Ship Index (EEXI) would reduce CO2 emissions by an estimated 6.6% and carbon intensity by 4.6% on bulk carriers. The study also demonstrates that derating the engines would only impact speed in limited circumstances.

Engine Power Limitation

EEXI was adopted on June 2021 and is expected to take action on January 1, 2023. The new technical measure assesses the CO2 emissions reduction per transport work based only on the ship’s design specifications. One of the most direct methods of complying with EEXI is to limit engine power (EPL).

In this regard, NAPA deployed real voyage data from more than 1,500 bulkers over a 12 months period in 2019. It examined the true operational profiles of vessels in actual weather conditions. Thus, analyzing the impact of maximum EPL on these operations.

The required EPL for most vessels to comply with EEXI would only have come into effect at high-speed peaks. Therefore, vessel operations would have remained largely similar, in case that EEXI applied for most of the year.

Moreover, the required regulation of speed would have reduced the transportation capacity by an average of 2% for bulkers. This would depend on the built year of each vessel.

What do the researchers say?

“While this is a good start, it shows the gap between what EEXI can achieve and how much more ground there is to make up. It shows why, at MEPC 77, to truly match the level of ambition that has come out of COP26, the IMO member states will need to prioritise efficiency. It (study) does, however, demonstrate that EEXI can reduce carbon intensity and that the carbon savings outweigh the reductions in lost transport capacity. It’s one step on a much longer journey.”

Teemu Manderbacka, Lead R&D Engineer, NAPA

“We wanted to analyse the effect of EEXI on real-life operations, so we tried to answer the question, ‘what would have happened if EEXI was implemented in 2019?’. We discovered that it would be similar to limiting the top speeds of cars in Europe from 160kph to 130kph. For most users on most roads, it doesn’t really change anything; the only people it affects are those on the autobahn in Germany. It does, however, demonstrate that EEXI can reduce carbon intensity and that the carbon savings outweigh the reductions in lost transport capacity. It’s one step on a much longer journey.”

Teemu

Photo: NAPA

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