The article is devoted to the study of the legal aspects of the European Green Deal implementation in Ukraine, in particular in the context of the energy sector transformation the by increasing the share of renewable energy sources. There have been examined the key trends in the legal development of renewable energy and determines the environmental challenges caused by climate change and other negative factors affecting the environment, as well as analyzes the potential possibilities of adapting national environmental legislation to European legal standards in the field of renewable energy use. The author emphasizes the economic, social and environmental benefits of achieving the goals of the European Green Deal on the way to ensuring the sustainable development of Ukraine, calling for the creation of a clear and coherent system of legislation dedicated to the legal regulation of renewable energy in Ukraine. The results of the study points the urgency of creating an effective legal framework for the economy green transformation and the adaptation of energy and environmental policies to European requirements and standards. In the context of modern global environmental problems related to climate change, excessive pollution of atmospheric air, water and forest ecosystems, soil degradation as a result of both increasing anthropogenic load on natural resources and due to the development of objective laws of nature, one of the key priorities European environmental policy outlined the transition to the principles of sustainable development, which, in turn, generated the need to search for optimal mechanisms and concepts for ensuring such a transition. The European Green Course, adopted by the EU in 2019, is an ambitious and progressive strategy for the transformation of the European continent into a climate-neutral one by 2050. As a comprehensive conceptual package of legislative initiatives, to achieve this goal, the European Green Course includes not only the reduction of greenhouse gas emissions into the atmosphere, but also a significant increase in the share of renewable energy sources, an increase in the energy efficiency of European countries, and the integration of the energy markets of individual countries with the EU energy market. For Ukraine, the issue of implementing a policy of sustainable development by transitioning to the use of renewable energy sources is not only part of its European integration obligations, but also a time-tested necessity, taking into account the state of the country’s energy sector both during the war period and in the context of the post-war reconstruction of our country.