Energy efficiency technologies for waterborne transport: A systematic review and taxonomy pathway

Key Points

• The aim is to evaluate and categorize energy efficiency technologies (EETs) in waterborne transport to inform policy and investment decisions.
• Developed a decision-support framework connecting policy, investment, and operational appraisal.
• Applied performance quantification using segment-differentiated, non-additive metrics showing 30-55% CO2 reduction.
• Conducted a multi-criteria evaluation with 32 KPIs and various weighting scenarios to operationalize findings.
• Identified regulatory misalignment where non-fuel EETs are not recognized under the EU ETS framework.
• Demonstrated significant CO2 reductions achievable through targeted implementation of EETs.
• Highlighted the importance of a structured approach to operational evaluation across various transport segments.