Japan tests first hydrogen-engine tanker in Osaka Bay

Japan demonstrated a 4,800-dwt coastal tanker powered by a hydrogen-fired four-stroke engine, described as a world first. The vessel sailed about 20 miles in Osaka Bay on September 25, cutting CO2 emissions by roughly 1.2 tons versus conventional fuel.

• Tanker sailed about 20 miles in Osaka Bay over roughly two hours on September 25
• CO2 emissions cut by approximately 1.2 tons
• Yanmar 500 kW hydrogen engine generates electricity for two electric propulsion motors
• Built by Fukuoka Shipbuilding, delivered to Uyeno TransTec in October 2025