The refining and chemical sectors contribute significantly to global CO2 emissions, with hydrogen production being a major source. Most hydrogen is currently produced using fossil fuels, leading to high carbon intensity. Transitioning to green hydrogen, produced through water electrolysis powered by renewables, is crucial for decarbonizing these sectors. The article highlights the benefits of green hydrogen in ammonia production, particularly in reducing emissions and expanding applications like green ammonia in shipping and power generation. It also discusses the potential of green hydrogen in the refining sector for processes like hydrodesulfurization and hydrocracking, offering a pathway to low-emissions fuels. Hitachi Energy plays a key role in supporting green hydrogen projects by providing solutions for grid connection, electrification, and asset health, aiming to enhance efficiency and lower hydrogen production costs. Overall, the shift towards green hydrogen presents a positive outlook for reducing global carbon emissions and promoting sustainability in key industrial sectors.