chapter  5
Environmental management in shipping
Theory and practice of energy-efficient ship operation
WithRoar Adland, Kristoffer Thomassen, Erland Østensen
Pages 18

Energy efficiency is defined as doing more useful work with the same amount of energy consumption (IMO, 2009). It applies to both the design and the operation of ships and can mainly be improved in two ways: firstly, by enhancing technical efficiency through optimizing the hull shape and propulsion system. Secondly, by improving operational efficiency, mainly through voyage optimization, improved fleet management, and energy management.