Introduction. Green energy is energy production technologies, the use of which minimizes environmental pollution, including emissions of greenhouse gases into the atmosphere. Green energy uses inexhaustible and renewable sources, which include wind energy, solar energy, and hydroelectricity. The Ukrainian-Russian war made adjustments to green energy and the green energy transition of Ukraine. The value of renewable energy shifted from ecology to security, and then to economy. Even half a year ago, renewable energy sources were considered by the international community primarily as a tool for combating inevitable climate change and reducing carbon emissions. Today, wind, solar, bio, small hydro and hydrogen energy are key to national energy security and independence and cost significantly less than fossil fuels, although as of 2021, Ukraine’s renewable energy sector was fighting for the right to work under fair conditions guaranteed by the state, in 2023 it will become one of the foundations of the post-war reconstruction of Ukraine and is preparing for the further increase of the country’s energy independence.The purpose of the article is to research and find opportunities, proposals for a green energy transition in the concept of post-war reconstruction, taking into account the natural resource potential of Ukraine.Methods. The methodological basis of the study is a theoretical generalization and comparison, analysis and synthesis, conducting scientific research with the aim of finding new opportunities for the green energy front of Ukraine in the post-war period. The statistical and factual basis of the research is official data, namely the Green Future Index published by the Massachusetts Institute of Technology.Conclusions and prospects of further research. The challenges and possibilities of reconstruction and post-war development of Ukraine’s green economy are analyzed, and a possible development path to the green economic transition of the country’s energy sector is outlined. The Government of Ukraine has already announced an approach to the green recovery of the energy sector based on the principles of “build back better” and “build back greener” with an emphasis on renewable energy sources and energy-efficient technologies.Prospects for further research are to develop clear principles for the implementation of green energy in Ukraine in the post-war period with the aim of decarbonizing key sectors of the economy, taking into account the consistency of state policy for the implementation of important environmental goals.