The article discusses the research methods of indicators of structural and functional reliability for electricity consumers based on a retrospective analysis, which makes it possible to evaluate the causes of under-supply of electricity to consumers and to develop measures to eliminate these causes. The analysis of the reliability of overhead power lines of the power system. The analysis of the causes of failures for 2012–2018 showed that about half of the causes of failures are not established at all, other causes of failures are approximate. The exceptions are the causes of failures due to a malfunction of the relay protection and automation devices, the proportion of which in the total number of failures does not exceed 2–3 %. In order to obtain an objective assessment of the influence of climatic factors on the reliability of the electric power system, a special technique has been developed. This technique allows quantifying the average values of the correlation coefficients between the failure rates of overhead power lines and climatic factors.

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