Taisei Corporation has successfully operated a building entirely on solar power by combining photovoltaic generation with a hybrid energy storage system integrating batteries and low-pressure hydrogen. Their energy management system balances short- and long-term energy supply and demand, allowing for year-round renewable operation. The pilot project in Yokohama stored surplus PV power in batteries or converted it into hydrogen for later use, ensuring energy availability even during periods of low solar generation. Taisei plans to enhance the efficiency of their system to achieve fully optimized year-round renewable energy operation in buildings, aligning with their commitment to decarbonizing Japan's energy system.