The article discusses a breakthrough in green hydrogen production through decoupled water electrolysis (DWE) technologies presented in a recent review in Nature Reviews Clean Technology. Hydrogen, a crucial chemical feedstock, is currently produced from fossil fuels with high CO₂ emissions. DWE offers a clean alternative by utilizing renewable energy to power electrolysis, emitting oxygen instead of CO₂. The review details how DWE overcomes challenges faced by conventional methods, such as high costs and internal hydrogen leakage, by utilizing redox materials to produce hydrogen and oxygen without membranes. The article highlights the collaboration of global experts who have pioneered various DWE methods, presenting pathways for scaling up these technologies. Notably, DWE's energy storage capability through redox materials enables it to store energy and buffer fluctuations from renewable sources, making it compatible with solar and wind systems. This capacity makes DWE a critical pathway for low-cost green hydrogen production on an industrial scale. The potential impact of scaling up green hydrogen production is significant, with the current hydrogen market valued at $250 billion annually, projected to increase to $550 billion within ten years. Experts predict that green hydrogen could account for 10% of the future energy market, replacing a substantial portion of energy in various sectors. The sentiment towards DWE in the article is overwhelmingly positive, with experts emphasizing the potential for DWE technologies to become serious competitors to conventional electrolyzers in the next decade. The review sheds light on the long-term prospects of DWE technologies, emphasizing their role in revolutionizing hydrogen production for a green and sustainable future.