World's Most Advanced Container Vessels: Mærsk Line's Triple-E

Mærsk Line's Triple-E is not only the world's largest container vessel, but also boasts world record energy efficiency. Triple-E incorporates a 'twin skeg' or two-engine, two-propeller propulsion system with two 'ultra-long stroke' engines contributing to efficiency by operating at slower revolutions, thereby consuming about four percent less energy than the single engine / single propeller system used on the company's Emma Mærsk class vessels.
Coupled with other engineering advances, such as the ship's specially optimised hull and bow structures (which accommodate the lower operational sweet spot of the twin skeg propulsion system), as well as an advanced waste heat recovery system which captures and reuses energy from engine exhaust gas, the Triple-E achieves industry-leading environmental efficiency.
The waste heat recovery system effectively prevents the loss of 25% of the energy contained in the vessel's fuel by harnessing the hot exhaust gas before it escapes into the atmosphere.
This captured exhaust gas is used to turn turbines, creating mechanical energy to operate an electrical generator and reducing the engine's fuel consumption and CO2 emissions by roughly nine percent.