Abstract
Climate change, the level of environmental pollution, the assessment of the exhaustion of traditional raw materials for energy generation, the awareness of the fact that the negative impact on the environment is caused by anthropogenic activities, the world economic crises and the search for ensuring a happy and safe life for future generations became the driving force for the development of energy efficiency. But in order to understand the individual directions of tasks in increasing the level of energy efficiency, it is worth defining approaches to its assessment. It is interesting that this field includes not only the concept of "energy", but also has a connection and to some extent limitations with the fields of economics, ecology and law.
 This paper analyzes the concepts and approaches used in assessing the level of energy efficiency internationally and in the middle of the country. The results of the analysis showed that in global practice, energy efficiency assessment based on final consumption is used in four spheres of activity: production, transport, services and households. In each of the subsectors, the energy consumption indicator is evaluated in comparison with the previous year. And the index at the sector level is the average weighted sum of the indicators of its subsectors. To obtain better results, various types of adjustments are used. Climate corrections and purchasing power parity adjustments are one of them. To increase the level of energy efficiency within the country, it is possible to apply the listed practices at the regional level.
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