Dr. Joungho Park and his team at the Korea Institute of Energy Research conducted an economic analysis of water electrolysis for hydrogen production. Green hydrogen, a key eco-friendly fuel, is primarily produced through alkaline water electrolysis and PEM water electrolysis. The research compared the technical and economic aspects of these technologies to derive optimal operation strategies. It was found that utilizing renewable energy with an energy storage system can reduce hydrogen production costs. For PEM water electrolysis, applying electrical overload can enhance economic efficiency. The study also proposed optimal hydrogen production combinations tailored to Korea's energy landscape, showcasing how stable hydrogen supply at $4 per kilogram can be achieved. Dr. Park emphasized the significance of the research in guiding investment decisions for future hydrogen production systems using renewable energy.