The article discusses the potential of green hydrogen to revolutionize industries in New Zealand and contribute significantly to decarbonization efforts. Highlighting hydrogen as a versatile tool for decarbonization, the article delves into the challenges and opportunities associated with transitioning to emissions-free forms of hydrogen. The 'clean hydrogen ladder' is used to prioritize various applications, with fertiliser, methanol, shipping, steel, aviation, and energy storage identified as key sectors that could benefit from green hydrogen adoption. The article outlines the significant shift required in New Zealand's energy landscape to meet the demand for green hydrogen, including the need to expand renewable power capacity and establish a substantial electrolyser infrastructure. Storage of hydrogen for long-term energy purposes is explored, emphasizing the potential of underground reservoirs for holding large quantities of hydrogen. Moreover, the article highlights the role of hydrogen in decarbonizing steel production, with a focus on hydrogen-based direct reduced iron processes. Cost competitiveness with coal-based methods is identified as a key factor, with solar PV emerging as a cost-effective energy source for hydrogen steel making. The complexities of exporting hydrogen from New Zealand are also discussed, with various methods like cryogenic liquefaction and ammonia conversion being evaluated. Addressing the cost challenges associated with hydrogen production, the article discusses the need for scaling up electrolysers and utilizing low-cost materials to enhance efficiency. The emergence of alternative hydrogen types like 'gold' and 'orange' hydrogen is noted, signaling ongoing advancements in the field of green hydrogen technology.