Hong Kong is emerging as a leader in the adoption of hydrogen as a clean energy source, with a strong commitment to decarbonization. The city's strategic vision includes deploying hydrogen-powered infrastructure across multiple sectors, such as the impressive L12 power plant by HK Electric. This plant is set to achieve an efficiency rate of 58% using hydrogen, showcasing the city's dedication to reducing carbon emissions. Furthermore, Hong Kong has launched nine hydrogen trial projects spanning electricity production, transportation, and heavy industry to test the feasibility of this green fuel, illustrating its ambition towards a carbon-neutral future by 2035. Collaboration with global energy giants like Mitsubishi has further propelled these efforts, bringing expertise and innovation to Hong Kong's energy landscape. This proactive approach not only addresses the city's carbon footprint but also paves the way for global cities to follow suit, potentially revolutionizing sustainable urban development in the 21st century.