On December 20, CNOOC made a significant advancement in hydrogen production technology by successfully initiating the trial operation of their megawatt-scale seawater electrolysis device. This breakthrough marked a crucial milestone for CNOOC, showcasing their prowess in direct electrolysis of seawater hydrogen production. The device, designed specifically for offshore renewable energy applications, boasts a hydrogen production capacity of 200 standard cubic meters per hour, ensuring high-purity hydrogen output crucial for industries like fuel cells and electronics. Comprising core equipment in five containers, the device's compact structure facilitates easy movement and high hydrogen purity, making it ideal for offshore production platforms. Expert appraisal confirmed the device's international-leading technology status. By leveraging anti-fluctuation control and coupling with offshore renewable sources, the device can efficiently utilize electricity from offshore wind and solar power to electrolyze seawater, ensuring stable and continuous high-purity hydrogen production. This development not only signifies a remarkable achievement in hydrogen technology but also paves the way for sustainable hydrogen production in offshore environments, contributing to the global push for clean energy solutions.