This is an integrated large-scale pilot project, located at a refinery complex in Tomakomai City on the island of Hokkaido in Japan, which is capturing carbon dioxide (CO₂) from the refinery’s hydrogen production unit with a steam methane reformer and a pressure swing adsorption process and injecting the CO₂ by two directional wells to the nearby offshore sub-seabed injection site. The overall objective is to demonstrate the technical viability of a full carbon capture and storage (CCS) system, from capture to injection and storage in saline aquifers. This will contribute to the establishment of CCS technology for practical use in Japan and set the stage for future deployments of commercial-scale CCS projects. The project includes capture and injection of up to about 100,000 tonnes per year of CO₂ for three years and a comprehensive measurement, monitoring, and verification regime for the injected CO₂. The project also includes a detailed public outreach effort that has engaged local stakeholders and increased community awareness about CCS and its benefits.