Japan, known for its technological advancements, is witnessing a shift in focus from hydrogen to ammonia in the energy sector. Ammonia, a sustainable fuel source, has the potential to revolutionize heavy transport and energy due to its efficiency and storage capabilities. Equinor's recent launch of an ammonia-powered supply vessel marks a milestone in renewable energy adoption, offering a more environmentally friendly alternative to fossil fuels in the marine industry. Ammonia, with its ability to store and transport hydrogen effectively, presents advantages over hydrogen in terms of practicality and sustainability. Its zero carbon emissions and ease of storage at low pressures make it an appealing choice for industries requiring large fuel quantities. However, challenges such as safety risks associated with ammonia's hazardous nature and logistical complexities need to be addressed through additional investments and safety measures. Despite the praise for hydrogen in green transportation, ammonia's potential as a catalyst for a more eco-friendly energy era is becoming evident. It offers simplicity in production, affordability, and a feasible solution for the industry to embrace renewable energy sources. As the world navigates towards a greener future, the emergence of ammonia poses a threat to hydrogen's dominance but also opens doors to a more sustainable energy landscape.