Digital transformation and energy transition are undoubtedly the key trends of the last decade that are fundamentally changing the way countries, regions and the global community conduct their economic activities. At first glance, these are phenomena of completely different nature. The editors and authors of the book offer a closer look at the specifics of the development of each trend, the nature of their interdependence, analyze the possibilities of coexistence, and determine the potential effects of such technological symbiosis. The book is characterized by an original, interdisciplinary statement of the problem: description of various aspects of effective interaction between elements of energy and information-technology/digital infrastructures that jointly ensure information needs and compliance with energy efficiency requirements of the modern economy. At the same time, attention is paid to each technological trend separately, as well as to the possibilities of interaction between technological capabilities of energy and digital. International author teams of professionals in different fields offer an interesting perspective on certain aspects of modern technological development of various industries. The book will be of interest to both experienced researchers, undergraduate and graduate students, and practitioners, both energy and IT specialists and even mathematicians.