The push to cut greenhouse gas emissions through wind-assisted ship propulsion continues to gain traction after Anemoi completed the installation of four folding rotor sails on a newcastlemax vessel.

UK-based Anemoi Marine Technologies completed the retrofit on Berge Bulk’s 208,000-dwt newcastlemax Berge Meru after installing four folding rotor sails, 5 meters in diameter and 35 meters in height, marking the company’s second rotor sail project with Anemoi.

The installation was carried out at Yiu Lian Dockyards, China, in December 2025 and the vessel has now completed its first voyage to Singapore.

The project follows the delivery of four 5x35m Anemoi rotor sails on Berge Neblina, a Berge Bulk Valemax, in June 2024, the first vessel in Berge Bulk’s fleet to be equipped with Anemoi’s rotor sail technology.

According to Anemoi, the folding rotor sails can be lowered when required, allowing flexibility for port operations and air-draught restrictions while maintaining performance at sea.

However, as the company explains, the rotor sails do not need to be lowered in extreme weather, they will stop generating thrust when simply switched off.

“We are proud to complete our second project with Berge Bulk, bringing large-scale folding Rotor Sails to another vessel. Berge Meru demonstrates how wind propulsion can be integrated into commercial bulk carriers in a practical and operationally flexible way. We value Berge Bulk’s continued confidence in our technology,” Clare Urmston, chief executive officer of Anemoi, said.