Public governance in the energy sector is influenced by international commitments, the Fourth Industrial Revolution, and evolution in public governance All of these create the need for a flexible energy system, greater public involvement, protection of the public interest, climate change mitigation, and innovation, which would be achieved through a transformation from traditional to smart public governance Smart public governance, as identified in the academic literature, is about adapting public authorities to environmental change by building the relevant skills, knowledge, and competencies, but is only partly focused on the transformation of society and the energy system The dissertation aims to find out which factors of public governance increase the efficiency of the Lithuanian energy sector The analysis of the scientific literature has led to the identification of the importance for the efficiency of the energy sector of ensuring changes in all the systems 307 involved (public governance, energy, and society), identifying the features necessary for the progress of each system and forming a model of smart public governance in the energy sector The developed methodological tool has created the prerequisites for the identification of the significance of the factors of smart public governance in the energy sector, which are important for the modeling of smart public governance in the Lithuania energy sector, to achieve the efficiency of the energy sector.