By analyzing the strategic documents on the development of the energy sector of the national economy of Ukraine, the article states that one of the key problems of the development in the context of the energy transition is that these documents lack goals and objectives to change the mentality of the population of the country and the human resources of the industry, as well as of public authorities and the administration of their activities. The article outlines the practical lack of conscious consideration of behavioural factors of human resources in the energy sector of national market economy, which is defined as one of the most difficult components to change given the energy transition of global national economies. To theoretically substantiate the possibilities of improving the public management of the energy transition strategy of the national energy supply system through the intellectualization of its managerial and executive personnel, the article proposes the use of technology of change management in the intellectual orientation and mentality of human resources involved in energy generation, distribution and consumption by intellectualizing and changing their mentality. For this, the article uses an original method and algorithm to create personal and group intellectual portraits based on the graph-analytical model of a person’s economic temperament. Ideal, desired and real portraits of a person were formalized, and recommendations were made on their possible participation in the energy supply processes. The article demonstrates that new mechanisms for using the intelligence of each employee and the collective intelligence of the system can be formed in the country’s energy management system through selecting human resources for the public management and administration system according to the reasonable and recommended intellectual dominants of the individual. These mechanisms are directed towards accomplishing tasks and ensuring the achievement of the goals of energy transition and sustainable development of the country, as outlined in the government document “Energy Strategy of Ukraine until 2050.