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The transition to sustainable urban mobility solutions is imperative in the face of escalating environmental and health challenges. This paper reviews the work in the areas of decarbonizing power systems, urban mobility and transportation modes, and the integration of renewable energy in smart cities. The integration of renewable energy sources, such as wind and solar power, into power systems is pivotal for decarbonization. However, their intermittent nature poses challenges for high-level integration. Energy storage emerges as a crucial solution, with technologies like fuel cell vehicles, water electrolysis, and flow batteries playing significant roles. Urban mobility, dominated by internal combustion engines, has led to environmental degradation and health issues. Transitioning to cleaner transportation modes, integrating electric vehicle stations with renewable energy, and ensuring uninterrupted power supply are essential steps forward. Furthermore, the potential of smart cities harnessing non-dispatchable photovoltaic and wind power is vast. Yet, the challenge of large-scale energy storage remains. The concept of using renewable energy to produce hydrogen, which can then stabilize the grid, offers a promising avenue. This review underscores the importance of integrating hydrogen energy storage to revolutionize urban mobility solutions.