Developing sustainable renewable energy projects involves complex decision-making processes. At present time planning and developing of renewable energy projects across the globe imply calculation and consideration of negative environmental effects at all stages of energy project life cycle. The aim of the paper is to develop an environmental effects evaluation methodology based on ecological impact categories through all the stages of lifecycle of renewable energy technologies. We used data envelopment analysis to calculate the efficiency score for each renewable energy technology. EcoInvent database has been chosen as a source of eco-indicators. We suppose the efficiency ratio will remain unchanged when transferring estimates of the life cycle of renewable energy facilities to another territory. This allows us to use data obtained in other regions of the world to extrapolate comparative assessments and make the deliberate choice of the most environmentally preferable technology. The input-oriented DEA modelling has demonstrated geothermal and biogas technologies are the most preferable from an environmental point of view with the highest possible score. The least effective technologies are both modifications of PV with the minimum efficiency score. The results of the presented work indicated that DEA showed great promise to be an effective evaluating tool for future analysis on energy policy issues.

The transition to circular economy models is a big challenge for enterprises, since it forces them not only to change established supply chains, pay extra attention to the quality and durability of manufactured products, develop schemes for the collection and subsequent disposal of products that have worked out their life, but also actively develop eco-innovation activities and participate in R&D more actively. The aim of this work is to study examples of the implementation of circular business models from the leading EU-based companies. The focus of the research on European companies is due to the fact that the European Union has been implementing a plan for the transition to a circular economy since 2015. In order to track the nature of applied eco-innovation in the field of CE the case-studies from the leading EU-based companies have been analysed. The choice of the companies is determined by their commitment to the CE principles and availability of the obtained results in their annual reports. The case-studies have shown all reviewed companies demonstrated beyond average commitment to the principles of CE in all aspects (sayings, doings and materiality). Their strong adherence is determined by their intense environmental impact and leading positions at regional and global markets.

Hydrogen energy is still at an early stage of development: Nevertheless, national and international strategies are used to boost its development by all kinds of incentives, subsidies, tax instruments and R&D financing of pilot projects in order to achieve the main goals: decarbonization of the energy sector, ensuring the reliability of supply of energy systems. The technical capabilities of decarbonization are still coexisting with high production costs, difficulties in storing and delivering hydrogen to consumers. Shift to hydrogen economy is not possible without thorough consideration of policies at different levels as well as technological advances. In this article the author analyses current situation of Russian hydrogen economics from strategic and technological point of view. The main agenda-setting documents and contributors in the field of technical deployment of hydrogen projects have been analyzed by applying content-analysis. Main policy implications and recommendations have also been given.

The first part of the research was devoted to the analysis of the existing policy framework in the field of energy efficiency and energy saving in Uzbekistan. During the last decade there is an extensive growth of number of policies regarding energy savings and efficiency. But their main focus is on technical and financial aspects of policies deployment. At the same time minor attention is paid to promote public awareness in the field of energy savings and efficiency. The second part of the research was designed to study the application of various energy saving practices among the young adults of Uzbekistan. The research method was a survey with subsequent processing of the results by methods of descriptive statistics. The analysis of conducted survey showed that the most popular energy saving practices in Uzbekistan are either those that are established everyday habits or those that can bring tangible financial benefits considering current economic conditions.