The energy industry is involved in the extraction, production, refining and distribution of energy sources. These can be primary sources such as crude oil, natural gas and coal or secondary sources such as electricity. In general, energy, as a determinant of the functioning of the economy, fundamentally affects the standard of living of society and the political position of the country. The level of energy consumption in the modern world is subject to constant changes. Global and regional trends show that energy demand will soon be covered by the widespread use of renewable energy sources. Energy sources conditioned by weather and climate conditions are characterized by significant spatial and temporal variability. This paper talks about the energy sector, the legal and strategic framework of the EU and the Republic of Croatia, the technologies of renewable energy sources and the future of the development of renewable energy projects. The paper begins with an analysis of the energy sector, the legal framework and statistical data, and a brief overview of future development. Furthermore, the paper analyzes the energy sector of the Republic of Croatia as well as the legal and strategic framework, the drivers and potentials of the development of this sector and ultimately the projects of renewable energy sources. The results of this study show the direction of development of the energy sector and the potential of development of renewable energy sources in the Republic of Croatia. In order to facilitate the development of technologies of renewable energy sources, this paper highlighted the importance of policies, strategic frameworks, initiatives and projects for the development of renewable energy sources with reference to the Republic of Croatia.