The first-ever Energy Efficiency Design Index (EEDI) certification for a large container vessel owned and operated by Hapag-Lloyd has been conducted by Germanischer Lloyd (GL). The EEDI certificate is issued in accordance with the voluntary EEDI guidelines, MEPC.1/Circ.681 and 682 of the International Maritime Organization (IMO). The attained EEDI value of the Hapag-Lloyd vessel is significantly better than the present average vessel of this size (based on Lloyds database), underlining the high energy efficiency of the vessel's design. This documents that members of the maritime industry are pro-actively pursuing measures to improve the energy efficiency of merchant vessels and, thus, reducing the CO2-emissions considerably.