The topic of diploma paper is the representation of renewable energy sources in the planning documents and legal regulations of the Republic of Croatia. Namely, as a full member of the European Union, the Republic of Croatia has committed to create planning documents and to develop a legal framework that will regulate the field of renewable energy in order to keep pace with advanced European energy and climate policy. The first part of the paper focuses attention on energy policy and the most important documents of the European Union, which set clear targets in the field of reducing greenhouse gas emissions, increasing the share of renewable energy in final energy consumption and energy efficiency, and then presentes the most important acts which, most important of all, obliged Member States to create their own national plans and strategies. The central part of the work is dedicated to the Croatian legal framework in the field of renewable energy and presents the most important legal regulations, the central role of which is occupied by the Law on Renewable Energy Sources and High Efficiency Cogeneration, and then bylaws that jointly aim to encourage the development and use of renewable sources. After the presentation of legal regulations, two of the most prominent planning documents were presented, setting out national goals and measures for their achievement, and which focus on the energy transition of the Republic of Croatia to renewable energy. At the end of the work, support schemes are listed as key mechanisms available to the Republic of Croatia in stimulating the production and use of renewable energy, and also the role of renewable energy sources in achieving sustainable development has been established.