Accelerating the transition of the energy sector to ecologically clean energetics using renewable energy technologies will ensure the security of the energy sector of the European Union based on highly energy-efficient and cost-effective technologies for generating heat and electricity. The aim of the study is to assess the economic and ecological aspects of the implementation of renewable energy technologies in Ukraine based on the analysis of trends in the transformation of both the global and the European energy sector. The approach proposed in this article makes it possible to reasonably determine the prospects for the use of environmentally safe energy-saving technologies using renewable energy sources. The analysis of the economic and environmental aspects of energy production based on renewable energy technologies, the condition of development and directions of transformation of the European energy sector is illustrated on the basis of a comprehensive assessment of the efficiency of the use of energy- and resource-saving, environmentally safe and cost-effective innovative technologies of non-traditional and renewable energy sources. This is achieved through the use of a comprehensive generalized dimensionless criterion of energy- ecological-economic efficiency of innovative technologies with the aim of increasing the level of energy-economic efficiency and environmental safety of the energy sector. According to this approach, it is determined that the effective integration of a certain energy- and resource-saving, environmentally safe and economically efficient innovative technology using renewable sources in Ukraine is possible.