Mitsui OSK Lines & Tohoku Electric Power announced that a coal carrier equipped with Wind Challenger, a hard sail wind power propulsion system, was delivered and started operation on 7 October 2022. At the completion of the vessel, a naming and handover ceremony was held at Oshima Shipbuilding and the vessel was named SHOFU MARU. The SHOFU MARU is the world's first vessel equipped with Wind Challenger, and will transport coal mainly from Australia, Indonesia, and North America as a dedicated vessel for Tohoku Electric Power The Wind Challenger is a system, developed mainly by MOL and Oshima Shipbuilding, which uses a telescoping hard sail that harnesses wind power to propel the vessel. By installing the system, it is possible to reduce the amount of fuel used for operation, which is expected to reduce environmental impact and improve economic efficiency. The introduction of the Wind Challenger is expected to reduce greenhouse gas emissions about 5% on a Japan-Australia voyage and about 8% on a Japan-North America West Coast voyage, compared to a conventional vessel of the same type, and contribute to curbing GHG emissions during fuel transportation.