The steel industry is facing the challenge of reducing its environmental impact, especially concerning CO2 emissions and energy consumption. In Terni, Italy, a groundbreaking project is underway to revolutionize steel production through the integration of green hydrogen technologies. The project involves the deployment of the world's largest Solid Oxide Electrolysis Cell (SOEC) at a steel plant operated by Acciai Speciali Terni. This initiative aims to showcase the feasibility and benefits of incorporating hydrogen into steelmaking processes under real operational conditions. By producing 100 kg/h of green hydrogen, the SOEC will power a fuel-flexible steel reheating furnace, significantly reducing CO2 emissions by 5,600 tonnes annually. The project emphasizes industrial circularity by utilizing off-gas heat recovery, oxygen recovery, and water recycling, demonstrating a holistic approach to sustainability. The involvement of key players like Elcogen, Baker Hughes, and academic institutions ensures expertise in solid oxide cell technology, electrolysis, and system integration. The collaboration aims to not only advance industrial adoption of green hydrogen but also create new market opportunities and promote commercial viability. Through innovative technologies and strategic partnerships, the project in Terni represents a significant step towards decarbonizing the steel industry and fostering a more sustainable future.