Subject. The economic subsystem of the regional system as an element of ensuring regional sustainability. Objectives. To determine the role and parameters of the economic factors of the stability of regional systems, assess the economic potential and evaluate the results obtained. Methods. The methods of systems, structural and comparative analyses, as well as integral normalization of indicators and calculation of potential function based on the methodology of N.V. Shalanov were used. The quantitative assessment of the economic potential was carried out using reference values and calculating the weights of the structural blocks – industrial, industrial, market, resource, financial, investment and infrastructural. Results. It is established that the economic potential of the economic subsystem is an integral indicator reflecting the combined ability of the subsystem to ensure adaptability, flexibility and sustainable regional development. Sustainability is determined not so much by the absolute magnitude of the potential, but rather by its internal structural balance and the interconnection of the main structural blocks. The assessment of the economic potential of the subjects of the Siberian Federal District made it possible to identify significant territorial differentiation and identify the leading regions (Kemerovo, Novosibirsk and Irkutsk regions) with the highest level of potential realization. The greatest contribution to the formation of economic potential is made by industrial, industrial and infrastructural blocks that provide the basis for regional stability. Conclusions. Economic potential is a functional characteristic of an economic subsystem, reflecting its ability to reproduce and adapt itself. The assessment of the structure and weights of its components makes it possible to identify the factors of sustainability and the directions of balanced development of the regions.
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