The concept of hydrogen energy is a comparatively novel and important part of developed nations' clean energy. Hydrogen economy symbolizes the potential future of humankind. Diminishing resources of our planet are urging us to look for renewable clean energy resources and hydrogen figures as distinguished energy carriers of a future sustainable energy system. There are important obstacles which need to be overcome to make hydrogen feasible in production, storage and power generation, however, the safety of operation remains a crucial aspect which determines the success or failure of a proposed solution. Latest advancements in these areas have been reviewed in this book, together with current research in the field of hydrogen energy and its use.