In Cardiff, Wales, Panasonic recently unveiled its RE100 facility, a sustainable initiative that operates solely on renewable energy sources. The site, a refurbished 50-year-old establishment, is powered by a combination of hydrogen fuel cells, solar energy, and battery storage managed by Panasonic's energy management system. The facility's utilization of hydrogen is notable, as it harnesses the heat produced by fuel cells to provide warmth to the building and hot water, showcasing the versatility of hydrogen in energy applications. Shigeki Yasuda and Masaya Aiba from Panasonic elaborate on the challenges faced during the project, particularly in adapting to UK safety standards for handling high-pressure hydrogen, and the differences in energy use culture between Japan and Europe. Through collaboration with local experts and a construction company, Panasonic successfully optimized the heat utilization from the fuel cells, resulting in a 50% reduction in power consumption. The project highlights the importance of understanding and complying with diverse regulations in different regions and underscores the significant role hydrogen plays in the future of clean energy and global energy transition.