High Temperature Steam Electrolysis emerges as a game-changing technology for clean hydrogen production, operating at 500-1000°C to achieve remarkable efficiency exceeding 90%. Major corporations including NuScale Power & Topsoe are pioneering commercial applications, with nuclear integration demonstrating unprecedented scalability. Global manufacturing capacity is set to double by 2025, while system costs continue declining toward $1,000 per kilowatt, positioning HTSE as a cornerstone technology for the hydrogen economy's rapid expansion.