The aim of this paper is to show how renewable energy sources can become a stable energy source if hydrogen is used to store energy, and how hydrogen can be used in environmental protection. The paper also gives an account of the use of energy throughout human history and by using the Kardaschev scale it shows what we can expect in the near and distant future related to energy. The paper describes the most common forms of hydrogen production, the possibilities of its implementation at local and global level as well as its advantages and disadvantages. The paper lists laws and regulations that show the extent to which the European Union and its members (such as Croatia) count on hydrogen as an energy source to achieve the goals of sustainable development. Also, it shows what steps the EUis taking in order to achievetheirgoal of making use of hydrogen in all aspects of everyday life. At the end of the paper a case study “The town of Vukovar- Implementation of Hydrogen “is presented. Based on data on renewable energy sources in that area, the most suitable way of obtaining energy for the production of green hydrogen was selected. Also, the case study takes into account data on the traffic importance of the town of Vukovar, the number and type of traffic vehicles, geographic data, data on the economy and population of thetown as wellcurrent energy infrastructure and projects related to energy in the area around the town. Based on these data a proposal was made for the possible implementation of hydrogen in the town of Vukovar and costs were also indicated. It is necessary to make a global energy transition from fossil fuels to other energy sources in order to preserve the environment and ensure energy security. Due to its multi-functional ability to meet the goals of sustainable development and energy transition, green hydrogen is emerging as a possible part of the solution to this problem.