This study focuses on estimating CO2 emissions and analysing energy efficiencies using the Energy Efficiency Operational Index (EEOI) for ferries sailing within an urban port of Taiwan and passenger-ships operating on island routes surrounding Taiwan. A comparative analysis of energy efficiency parameters showed that hybrid diesel-electric ferries had a 12% improved efficiency compared to the traditional full-diesel ferries, while high-speed passenger ships had up to 79% lower efficiency than medium-speed passenger ships. Some potential policies for reducing CO2 emissions from in-port ferries and island passenger-ships are presented based on these results. The estimated CO2 emissions from in-port ferries sailing within the urban port could be reduced by 10% when employing hybrid diesel-electric ferries instead of traditional full-diesel ferries. Emissions from island passenger-ships operating on island routes could be reduced by 11-26% through utilising small medium-speed passenger ships instead of small high-speed passenger ships and large passenger ships.
Keywords: Island country; Marine environmental policy; Passenger ship; Ship energy efficiency; Shipping emission.
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