The book "Hydroelectric power plants in electric power systems" by Vladimir Obrizkov is a fascinating and in-depth study devoted to one of the key components of the modern energy landscape - hydroelectric power plants (HPPs) This edition will be a real find for both energy professionals and students studying this important discipline. In his book, Obrizkov not only describes the technical aspects of the work of hydroelectric power plants, but also immerses the reader in the world of complex relationships that exist between hydroelectric power plants and electric power systems in general. The author analyzes how hydropower affects the sustainability and reliability of energy supply, and also considers their role in the context of global challenges such as climate change and the need to switch to more sustainable energy sources. The reader will be able to learn about modern technologies used in the construction and operation of hydropower plants, as well as about new approaches to water resources management. The book will be of interest not only to professional power engineers, but also to a wide range of readers interested in ecology, sustainable development and modern technologies. Students of technical universities, graduate students and young specialists will find in it valuable knowledge and practical recommendations that will help them better understand the complex processes occurring in electric power systems. The topics raised in the book concern not only technical aspects, but also social, economic and environmental issues, which makes it relevant for anyone who wants to understand the modern challenges of the energy industry. The style of Vladimir Obrezkov is distinguished by clarity and accessibility, which allows even readers without deep technical knowledge to easily assimilate complex concepts. His approach to the presentation of the material is based on rich experience and scientific research, which gives the book additional value. Pruning is also known for his other work in the field of energy, which has been recognized both in Russia and abroad. His research and publications have always been distinguished by a high level of scientific validity and practical significance. Hydroelectric power plants in electric power systems will be an important source of information for all who are interested in the future of energy. In the context of global changes and the need to switch to sustainable energy sources, understanding the role of hydropower becomes especially relevant. Readers will be able not only to learn about current trends, but also to think about how hydroelectric power plants can become a key element in solving the energy problems of our time. If you are looking for literature that will help you better understand how hydroelectric power plants function and how they fit into the overall picture of electric power systems, then Vladimir Obrzkov’s book is exactly what you need. It will not only enrich your knowledge, but also inspire new ideas and solutions in the field of energy. Do not miss the opportunity to get acquainted with this important work, which will certainly take a worthy place in the library of everyone who is interested in the future of our planet and sustainable development.