The authors propose the Summary Energy Efficiency Index to characterize the efficiency of energy use and energy consumption. The suggested index consists of four pillars: Energy Use, Energy Savings in Public Sector, Smart Consumption, Ecological Footprint. This index enables a comprehensive assessment of energy efficiency mainly on official statistics. Taking into account the structure of end-use electricity consumption in Russia we suggest subdividing regions into four clusters and assessing efficiency of energy use within each cluster. In terms of energy productivity regions with a large share of industry in GRP are rather effective. The level of development of digital technologies in a region is a substantial part of assessing smart energy consumption. However, we should also consider the efficiency of electricity use in the public sector, the development of smart energy and environmental impact, which is essential for sustainable development.