Green Navy has achieved a significant milestone with the certification of the REXH2 hydrogen fuel cell, marking a breakthrough in maritime technology. The system, endorsed by the Bureau Veritas Marine & Offshore, showcases the highest safety and performance standards. Green Navy's upcoming PROMETEO project will feature Europe's premier electro-hydrogen-powered 24-metre catamaran for eco-friendly commercial transport. The project manager, Guy Saillard, praised the REXH2 fuel cell for its equipment maturity, marine adaptation, and operational safety. The power range of the fuel cell aligns perfectly with PROMETEO's energy needs, providing variable power to the propulsion system and enabling efficient battery pack recharging. Green Navy aims to conduct a safety review by June 2026 in preparation for ordering hydrogen components for construction. The generous subsidy from the Brittany Region underscores the project's commitment to renewable hydrogen development. Green Navy's initiative represents a promising step towards sustainable marine transportation powered by innovative hydrogen technology.