# DNV Certifies China’s First Domestically Developed Rotor Sail System
Classification society DNV has awarded a Type Approval Design Certificate (TADC) to CSSC Shanghai Marine Energy Saving Technology Co., Ltd. (CMES-Tech) for its innovative 5m × 35m Tilting Type Wind Assisted Rotor System. The certification marks a significant milestone as the first domestically developed rotor sail technology in China to achieve formal design approval, validating the system’s technical feasibility and safety standards for maritime applications.
Wind-assisted propulsion systems have gained considerable traction across the shipping industry as vessel operators seek to reduce fuel consumption and lower carbon emissions in response to tightening environmental regulations and volatile fuel costs. Rotor sail technology, which harnesses wind energy through rotating cylinders, represents an increasingly viable retrofit and newbuild option compared to traditional sail designs. The tilting capability of CMES-Tech’s system offers operational flexibility, allowing mariners to optimize performance across varying sea and weather conditions while maintaining maneuverability.
The TADC approval positions China’s maritime technology sector competitively within the growing wind-propulsion market, traditionally dominated by European manufacturers. As shipping decarbonization becomes mandatory under IMO 2030 and 2050 targets, domestically developed alternatives could accelerate adoption among Chinese shipowners and operators. The certification likely encourages further investment in similar technologies while establishing regulatory pathways for comparable systems seeking formal approval.