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Athens is modernizing its urban bus fleet by 2027, introducing over 1,100 new vehicles to improve public transport and promote greener mobility. The Athens Urban Transport Organisation's bus operator OSY has already incorporated 740 new buses since 2024, with plans to reach 865 by May.

By 2027, the fleet will consist entirely of modern vehicles equipped with advanced technology and low or zero emissions. A pilot program for hydrogen-powered buses is planned, alongside infrastructure upgrades including high-capacity chargers and a hydrogen refueling station. This modernization aims to enhance service reliability and passenger experience.