The book "Fundamentals of the theory and calculation of the reliability of power supply systems: methodological guidelines for solving problems" is a unique manual created by the team of authors, which will become an indispensable assistant for students, graduate students and practitioners in the field of energy and electrical engineering. With the rapid development of technology and increasing demand for reliable electricity, this book offers a systematic approach to understanding and calculating the reliability of electrical systems, which makes it relevant both for the educational process and for practical application. The book focuses on key aspects of reliability theory that cover both theoretical foundations and practical techniques. The authors consider in detail various models and methods for assessing the reliability of power supply systems, which allows the reader not only to learn theoretical knowledge, but also to learn how to apply them in practice. The book contains many examples and tasks that will help to consolidate the material and develop skills in solving real engineering problems. This work will be of interest not only to students of technical specialties, but also to engineers working in the field of design and operation of electric grids. It can also attract the attention of researchers dealing with the reliability and sustainability of energy systems. Readers interested in the topics of sustainable development, renewable energy and energy efficiency will find much useful information in this book. One of the key topics raised in the book is the importance of reliability in modern power supply systems. With increasing demands on the quality and continuity of power supply, understanding the factors affecting reliability is becoming critical. The authors emphasize the need for an integrated approach to the design and operation of systems, which minimizes risks and increases the overall efficiency of energy facilities. The style of the authors is distinguished by clarity and accessibility of presentation, which makes complex topics understandable even for those who are just beginning to get acquainted with this area of knowledge. The book is written taking into account current trends and requirements, which makes it relevant and useful for a wide range of readers. The team of authors includes experienced specialists who share their knowledge and experience, which gives the book additional value. If you are looking for literature that will help you to better understand the basics of power reliability, as well as learn how to solve practical problems in this area, then "Fundamentals of the theory and calculation of the reliability of power systems: methodological instructions for solving problems" will become your reliable companion. This book will not only enrich your knowledge, but also help you become a more competent specialist in the rapidly changing world of energy. Do not miss the opportunity to get acquainted with this important work, which will become the basis for your professional growth and development in the field of electricity supply . Looking for literature on the reliability, sustainability and efficiency of energy systems, you will definitely come across this book, which will be your faithful assistant in mastering complex but fascinating topics.