The article reveals the features of selecting critical facilities for the fuel and energy complex (FEC СF) within joint industry and general energy model research. A comparative assessment of the methodology for determining the list of critical industry objects and the methodology for determining the list of FEC СF is given in this paper. A scheme for the preparation and analysis of the fuel and energy complex calculated states is described, the analyzed most important and related model indicators are highlighted, an integral indicator for assessing the criticality of elements is proposed. Also is provided a formalized description of the fuel and energy functioning optimization model and reveals a three-stage scheme for working with it in determining in the CF of FEC based on industry critical elements.

The paper presents the main provisions of the methodology for identifying vulnerable elements in the fuel and energy complex, which is studied as a set of industry critical energy infrastructures. This methodology is based on the use of industry models system in the fuel and energy sector, on the analysis of the interconnected critical energy infrastructure's work in normal functioning and during emergency situations. The paper proposes a schematic diagram for the formation of vulnerable elements list for fuel and energy complex based on critical elements of industries. The scheme of work with a two-level system of models is given. The results of testing the methodology and developed models are presented (illustrative example).

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The overall objective of the proposed work is to formulate the main provisions of the approach to the determination of critical objects for the fuel and energy complex within the framework of hierarchical system studies of the energy security problems for the country and its regions. This approach involves the use of a hierarchical system of models, presupposes a preliminary choice of critical objects for energy systems. The approach is focused on the analysis and evaluation of interrelated systems functioning when implementing threats to energy security (in the form of contingencies), requires the accounting for changes in the work of critical objects for industries. To assess the criticality of these objects for the energy complex as a whole, a criterion is proposed for the significance of objects by the most important model indicators.

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