Anemoi-led project targets rotor sail integration on MR Tankers
Left to right: Nick Contopoulos, Anemoi; Jesper Kristiansen, Hafnia; Huang Jun, GSI; and Mr Shao Guang Chi, DNV Maritime (Source: Anemoi)
Anemoi Marine Technologies has partnered with Hafnia, Guangzhou Shipyard International (GSI), and DNV in a Joint Development Project (JDP) to integrate Rotor Sails into 50,000 dwt medium-range (MR) tankers. Signed in April 2025, the initiative aims to enhance fuel efficiency and lower emissions across the global tanker fleet.
Anemoi and Hafnia will lead the engineering assessments, examining installation methods, electrical integration, and emissions impact – specifically improvements to EEDI and EEXI scores. GSI will develop the naval architectural and technical documentation required, while DNV will provide Approval in Principle (AiP) to ensure regulatory compliance.
Rotor sails, or Flettner rotors, are vertical cylinders that harness wind power to provide auxiliary propulsion. As decarbonisation pressures mount, their potential to offer immediate gains in fuel savings and emission reduction has drawn industry-wide attention.
Hafnia sees the collaboration as a key element of its long-term environmental strategy. DNV notes that the project aligns with emerging industry rules and recognises rotor sails as among the most promising technologies for improving vessel energy performance.
With the MR tanker fleet projected to grow, the JDP positions its participants to lead in sustainable tanker design and drive widespread adoption of wind-assisted propulsion systems.
