Hong Kong is making remarkable strides towards becoming the world's first city powered entirely by hydrogen energy, signaling a significant shift towards green city development. Hydrogen trials in the city have yielded promising results, surpassing benchmarks and showcasing the potential for a hydrogen-powered future. HK Electric's innovative strategies, including integrating hydrogen into energy sources and collaborating with Mitsubishi on hydrogen energy development in Japan, highlight Hong Kong's commitment to decarbonization and technological advancement. Moreover, government support for hydrogen trials across various sectors underscores the city's proactive approach towards sustainable energy solutions. By 2035, Hong Kong aims to significantly reduce carbon emissions through the phase-out of coal and adoption of hydrogen as a clean energy source. The city's progress in hydrogen projects not only demonstrates environmental benefits but also positions Hong Kong as a global leader in the hydrogen industry, attracting investments and expertise on a global scale. As Hong Kong leads the way in the hydrogen revolution, the city's experience serves as a model for other global cities looking to fast-track their energy transition towards a sustainable and hydrogen-powered future.