An artificial intelligence system is being tested in public hospitals in Hong Kong to optimize the energy efficiency of air-conditioning units. The system, currently implemented in several hospitals including the Tseung Kwan O Hospital and Queen Mary Hospital, adjusts temperatures based on data analysis to predict power consumption accurately. This initiative has already led to a significant reduction in electricity usage, with plans to extend the system to more hospitals. Alongside AI optimization, the hospitals are focusing on sustainability through the installation of solar panels, smart LED lighting, and advanced air-conditioning systems. Strategies such as retro-commissioning and utilizing combined heat and power solutions with biogas have been successful in reducing energy consumption and carbon emissions. Additionally, there are plans to transition to hydrogen energy, with a pilot program involving fuel cells for electric vehicles. These efforts highlight the commitment of Hong Kong hospitals towards green technology and energy efficiency for a more sustainable healthcare system.