In a demonstration at a warehouse near San Francisco, Ohmium showcased the process of electrolysis, where water is split into oxygen and hydrogen using electricity. This method, termed as green hydrogen production, is crucial for reducing carbon emissions in industries where direct electricity usage is impractical. Currently, less than 1% of hydrogen in the U.S. is produced using renewable sources, with the majority coming from natural gas, emitting carbon dioxide. To combat this, efforts are being made to scale up clean hydrogen production through electrolysis powered by renewables. Companies like Nel Hydrogen, Bloom Energy, and Ohmium are investing in developing renewable electrolyzer technology to meet the increasing demand for green hydrogen. The article discusses the history of electrolyzers, their evolution from fertilizer production to current applications in producing renewable hydrogen. Various types of electrolyzers exist, such as alkaline, PEM, solid oxide, and anion exchange membrane, each with distinct characteristics affecting their efficiency, cost, and material requirements. Companies are innovating to make electrolyzers more cost-effective and efficient, with solutions like cheaper alternatives to platinum and iridium in PEM electrolyzers. The article also emphasizes the growth potential in the green hydrogen sector, with the U.S. aiming to produce 10 million metric tons annually by 2030. This ambitious goal is driving research and development in electrolyzer technology, with a focus on scalability and sustainability. Overall, the shift towards green hydrogen production using electrolysis offers a promising solution to reduce carbon emissions in key industries and advance towards a more sustainable future.