The Seoul Metropolitan Landfill Management Corporation has initiated a project to develop large-capacity blue-green hydrogen production technology in collaboration with research institutes and beneficiary companies. The project targets the production of 3 tons of blue-green hydrogen per day by utilizing domestic plasma technology and low-temperature adsorption technology on landfill and urban gases. Blue-green hydrogen is produced through pyrolyzing hydrocarbon-based fuels at high temperatures, separating hydrogen and solid carbon, thus representing a carbon-free hydrogen production method. The corporation plans to explore by-products such as solid carbon and waste heat and establish a resource-circulating platform to convert landfill gas into clean energy. This initiative aims to contribute to national policies on carbon neutrality and create sustainable urban hydrogen supply chains. The partnership between public and private sectors is expected to pave the way for a clean hydrogen-based future energy system in Seoul and serve as an exemplary case for hydrogen diversification.