Hydrogen is seen as a versatile tool for decarbonisation, with the potential to address various energy needs. However, the shift from fossil fuel-based hydrogen to green hydrogen poses significant challenges. Global forecasts for green hydrogen demand vary, with Bloomberg's 2050 forecast suggesting a downward trend. In New Zealand, research indicates a potential demand of 2.8 Mt/y for green hydrogen, with applications in key sectors like fertiliser, methanol, shipping, steel, and energy storage. Challenges include the need for significant renewable power capacity and electrolysers for production. Long-term hydrogen storage and decarbonising steel production are identified as critical applications, alongside the complexities of exporting hydrogen due to logistical constraints. Costs remain a barrier, with efforts to reduce electrolyser costs and explore alternative hydrogen production methods. New Zealand's unique geology offers potential for innovative approaches like 'gold' and 'orange' hydrogen production. Despite challenges, the article maintains a positive outlook on the opportunities hydrogen presents for decarbonisation.