Clermont Auvergne Métropole has emerged as a trailblazer in the realm of hydrogen mobility, owing its success to a symbiotic relationship between public institutions, industrial players, and local businesses. This collaborative effort, particularly in partnership with Keolis, has propelled the region to the forefront of hydrogen mobility initiatives. Key local entities such as GCK Mobility, Symbio, and R3I have been pivotal in driving the project forward. GCK Mobility's retrofitting of a substantial portion of the fleet's vehicles, Symbio's provision of cutting-edge hydrogen fuel-cell technology, and R3I's enhancements at the bus depot have all contributed significantly to the project's advancement. Moreover, strategic alliances with renowned industrial titans like Ballard, Toyota, and Hyundai have facilitated the integration of diverse fuel-cell technologies into the initiative, broadening its scope and impact. Through these collaborative endeavors, Clermont Auvergne Métropole has not only demonstrated the efficacy of hydrogen fuel-cell technology in transportation but has also cemented its position as a frontrunner in the domain of hydrogen mobility.