Book excerpt: The 4Ds of Energy Transition Enables readers to understand technology-driven approaches that address the challenges of today’s energy scenario and the shift towards sustainable energy transition This book provides a comprehensive account of the characteristics of energy transition, covering the latest advancements, trends, and practices around the topic. It charts the path to global energy sustainability based on existing technology by focusing on the four dynamic approaches of decarbonization, decreasing use, decentralization, and digitalization, plus the important technical, economic, social and policy perspectives surrounding those approaches. Each technology is demonstrated with an introduction and a set of specific chapters. The work appropriately incorporates up-to-date data, case studies, and comparative assessments to further aid in reader comprehension. Sample topics discussed within the work by key thinkers and researchers in the broader fields of energy include: Renewable energy and sustainable energy future Decarbonization in energy sector Hydrogen and fuel cells Electric mobility and sustainable transportation Energy conservation and management Distributed and off-grid generation, energy storage, and batteries Digitalization in energy sector; smart meters, smart grids, blockchain This book is an ideal professional resource for engineers, academics, and policy makers working in areas related to the development of energy solutions.