Climate Change Research ›› 2021, Vol. 17 ›› Issue (2): 236-244.doi: 10.12006/j.issn.1673-1719.2020.048

• Greenhouse Gas Emissions • Previous Articles     Next Articles

Methodology for rating the operational energy efficiency performance of ships in the context of global climate governance

ZHANG Shuang1(), ZHAO Ying-Lei2, ZHANG Kun-Kun2, LI Lu3   

  1. 1 Dalian Maritime University, Dalian 116026, China
    2 Zhejiang Maritime Safety Administration, Hangzhou 310014, China
    3 Shanghai Rules and Research Institute of China Classification Society, Shanghai 200135, China
  • Received:2020-03-11 Revised:2020-04-22 Online:2021-03-30 Published:2021-04-02


In a joint effort to address global climate change, the International Maritime Organization (IMO) has considered imposing a regulatory regime on the operational energy efficiency of ships to complement the existing mandatory mechanism on design efficiency. However, the random and uncertain nature of the operational energy efficiency of ships poses a significant challenge to performance regulation. In this paper, a quantile regression model, with dummy variables representing the observation calendar years, is applied to quantify the level, the scale and the skewness of the distribution of the operational carbon intensity performance of international shipping. A rating mechanism is further constructed on this basis, which is able to guide the performance of international shipping as a whole in line with the levels of ambition, whilst being robust to certain individual deviations. This rating mechanism is demonstrated using the bulk fleet of China as a sample, which shows its competency as a systematic solution for scientific evaluation of the operational energy efficiency of ships.

Key words: Operational energy efficiency, Greenhouse gas emissions reduction, Carbon intensity, Rating mechanism, International Maritime Organization (IMO)

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