This book aims to review the key areas of modern research in power engineering regarding environmental conservation, as well as the research and development of digital technologies in the energy sector.The main result of fruitful work within the framework of the III International Conference "e;Energy Ecosystems: Prospects and Challenges: Applied Digital Technologies"e; has become this book, which includes 16 best reports on priority issues of modern energy development.The book is of interest to scientists, students, researchers, representatives of energy companies, representatives of leading Russian and European universities, and research institutes. We feel confident that our book will serve as an important source of information and knowledge that will lead to scientific and innovative progress in the field of sustainable development of the society.