The introductory part presents what reliability is in general, what it means in electric power systems. This work discusses of the theory of reliability, describes the network rules for obtaining reliability indicators, also discusses the basics of the NEPLAN program and the reliability analysis processed on the example for obtaining reliability indicators in the NEPLAN program. The second chapter discusses what is reliability in electric power systems, how reliability is predicted, what are the reliability indicators in the reliability theory itself and how to obtain them for irreparable and repairable elements. Every electricity system should fulfill the task of ensuring a reliable and constant supply of electricity to its consumers, therefore service providers, or rather distribution and transmission system operators should comply with the network rules. According to the network rules, general and individual reliability indicators are determined, as described in the third chapter. In the following chapters is described the program NEPLAN, how to make certain schemes, how to enter data for elements, how to get results. After that, an example is presented in the program NEPLAN, in which the basic parts of the main circuit diagrams are presented, and the reliability analysis is performed. During the reliability analysis in the NEPLAN program, tabular and graphical results are obtained in which the reliability indicators for each individual element in the system, as well as for the all system as a whole are presented