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Green hydrogen is currently considered a key element for delivering free-carbon energy. This paper provides an extensive assessment of the potential of green hydrogen technology as a pathway to the low-carbon economy while highlighting the major technical challenges to its implementation. A detailed overview of green hydrogen production, storage technologies, transportation infrastructures and green hydrogen implementations is provided. Status of the ongoing trends for repurposing the existing gas grid infrastructures to transport the hydrogen safely across Europe is presented in this work, with 48 sample projects statistically reviewed and classified based on the key challenges being addressed. The potential of green hydrogen in decarbonizing the energy sector and the associated technical challenges are widely reviewed and critically assessed. Detailed discussions have been provided on the optimal sizing of renewable hydrogen energy systems, real-world modelling of hydrogen energy storage elements and the smart energy management strategies for the application of hydrogen electrolysers as smart controllable loads. Some prospects are given on how digital key trends of blockchain technologies could support the growth of green hydrogen markets together with emphasis on the raised research questions. Further assessment is presented on the potential of green hydrogen versus blue hydrogen while reflecting on future directions and policy recommendations for planning a successful energy transition. Finally, some future insights and near-term policy recommendations are provided for promoting the use of green hydrogen production while supporting the green hydrogen industry.

A Comprehensive Review on The Potential of Green Hydrogen in Empowering the Low-Carbon Economy: Development Status, Ongoing Trends and Key Challenges