“…Nevertheless, several studies concerning energy sustainability and value chains are of particular interest. First of all, the Energy Trilemma Index suggested by Mastepanov and Chigarev (2020) is of great importance in assessing the sustainability of national energy policy and the development of safe, equally accessible, affordable, and environmentally sustainable energy [33]. Another interesting study was conducted by Palekhov and Palekhova (2018) who clarified the specific features of the modern concept of energy efficiency, which is based on three core dimensions-energy security, energy equity, and environmental sustainability.…”