RATP Dev, whose subsidiary CTY operates the La Roche-sur-Yon municipal federation’s Impulsyon transport network, has put a hydrogen-fuelled bus into service. This deployment is a concrete result of the unprecedented 100% green, 100% local hydrogen fuel production ecosystem that the Vendée energy authority (SyDEV) manages through its public-private entity Vendée Energie. With the new bus, RATP Dev demonstrates its ability to support urban transport networks of all sizes in their transition to emission-free fleets.