The book “Operational management in power systems . At 4 p.m.. H. 4. Prevention and elimination of emergency modes” by E. In. Calentionoc is a unique publication that will become a reference book for energy professionals, engineers and students studying power system management. The fourth part of this large-scale work is devoted to one of the most urgent and difficult topics - the prevention and elimination of emergency modes in power grids. Calentionok, known for his in-depth research in the field of energy, offers the reader not only theoretical foundations, but also practical recommendations that will help in real conditions. The book discusses methods and technologies that minimize the risks of emergency situations, as well as respond effectively to them if they do occur. This makes the publication especially valuable for those who work in an environment of increased responsibility and requires high professional training. Who can like this book? First of all, it will be useful for students of technical universities studying in specialties related to energy, electricity and control systems . It will also attract the attention of practicing engineers and specialists working in the field of operation and management of power systems. In addition, the book will be of interest to executives and managers who make decisions in the field of energy security and sustainability of systems. The topics raised in the book cover a wide range of issues related to emergency modes. The author analyzes in detail the causes of accidents, and also suggests methods for their prevention. An important aspect is the consideration of modern monitoring and diagnostic technologies that allow you to quickly identify potential threats and take measures to eliminate them. Kalentionok focuses on the need for an integrated approach to the management of energy systems, which makes his work especially relevant in the modern world, where the reliability of energy supply is critical. The author's style is distinguished by clarity and accessibility of presentation, which allows the reader to easily assimilate complex concepts and apply them in practice. E. In. Kalentionok is the author of several other well-known works in the field of energy, such as "Operational management in power systems . At 4 p.m.. H. 1. Basics of management” and “Operational management in power systems . At 4 p.m.. H. 2. Organization and Management . These books are also noteworthy and can serve as an excellent addition to the study of the topic. The book “Operational management in power systems . At 4 p.m.. H. 4. Prevention and elimination of emergency modes” is not just a training manual, but a real encyclopedia of knowledge for all who seek professional growth in the field of energy. It will help readers not only to better understand the mechanisms of power systems, but also to prepare for the challenges that they may face in their practice. If you are looking for information on how to effectively manage emergency situations in power systems, or want to deepen your knowledge in this area, then this publication will become your reliable assistant. Do not miss the opportunity to get acquainted with the work of Kalentionok and discover new horizons in the world of energy!