H2Rex is a pure hydrogen fuel cell cogeneration system that generates electricity and heat with hydrogen produced from renewable energy. Unlike fossil fuel power plants, H2Rex is quiet and does not emit CO2, making it safe to install where people live and work, such as near houses, buildings, and factories. H2Rex changes people's conventional image of infrastructure, thanks to its simple, unobtrusive design that blends in with the surroundings. H2Rex not only expands the utilization of hydrogen energy but also symbolizes next-generation infrastructure for a sustainable society.