Energy systems including electricity, heat/cooling, and gas supply systems represent a very important part of the infrastructure in Russia. This paper presents a general framework of integrated energy systems. Elements of the concept of integrated energy systems are suggested. The explanation of the concept elements is given as a three-layer structure of integrated energy systems in three dimensions. The problems of integrated control of electric and heat networks deal with issues of combined calculation of operating conditions of the electric and heat networks integrated in the intelligent energy supply system. A mathematical description of the problems is presented. The results of two illustrative case studies are shown and explained. The first case study represents research on an emergency situation at the supergrid level of the energy system layers after an accident on a pipeline of the gas transportation network. The second case study represents research of interdependency of power and heat supply minigrids in emergency conditions on the example of a city district. Preferable future work is discussed.

The paper is devoted to the search for critical combinations of gas industry objects from the standpoint of system operability. Critically important is the object partial or complete failure which can cause significant damage to the country from the fuel and energy complex in general or within the framework of a separate energy system. It is possible to failure of a critical and other object of the system. The paper presents the main major critical combinations of gas industry objects. Their significance and impact on the efficiency of the gas industry in Russia is shown. Conclusions are made about the expediency of searching for critical combinations of gas industry objects from the standpoint of system operability.

In the paper the scales of implementation of strategic threats to energy security are compared for different time stages. The main factors affecting the strengthening or weakening of these threats are shown. The estimation of the country’s total needs in primary energy resources and the required volumes of gas to fully cover these needs (taking into account the capabilities of other energy systems of the fuel and energy complex) is made. The total possible levels of Russian gas exports for the future are estimated. The possibilities of fuel and energy complex industries for the perspective satisfaction of the needs of domestic and export consumers are considered in detail.

This paper focuses on the specific features of the hierarchical approach in the energy security studies for modeling the processes of functioning and development of industry-specific energy systems within a single energy sector. The experience of developing and using hierarchical modeling in the study of reliability and survivability of energy systems is analyzed using the example of the unified gas supply system, oil system, oil product system, and the unified power system of Russia. In the paper, the hierarchy of models in the energy security studies is considered in terms of territory and structure.