Mitsui O.S.K. Lines (MOL) has been granted an approval in principle (AiP) by Nippon Kaiji Kyokai (ClassNK) for the first LNG carrier to be powered by a wind-assisted propulsion system. The vessel, with a cargo tank capacity of 174,000 cubic meters, will incorporate two Wind Challenger sails designed by Hanwha Ocean. The design underwent rigorous risk assessment, focusing on safety aspects such as sail placement and emergency procedures. Gaztransport et Technigaz SA (GTT) is responsible for designing the cargo tank. MOL's sustainability strategy includes introducing 25 Wind Challenger vessels by 2030 and scaling up to 80 by 2035, in line with its goal of achieving Net Zero greenhouse gas emissions by 2050. The Wind Challenger concept utilizes wind energy to drive the ship forward when winds are favorable and employs turbines to generate electricity and produce hydrogen during periods of low wind. Wind-assisted propulsion systems (WAPS) are gaining traction in the shipping industry due to their potential to reduce fuel consumption and emissions. Recent estimates suggest WAPS can deliver fuel savings between 4.5% and 25%, depending on installation types. Terntank is exploring suction wing sails technology for energy efficiency on tankers, with plans to integrate e-methanol and wind assistance by January 2027.