Book excerpt: The Future of Cities and Energies in Western Europe explores a variety of theoretical and empirical approaches to researching energy issues in Western European cities, as well as urban energy transition. It serves as a collection of materials, instruments, ideas, and theories to embrace this subject. The contributions are interdisciplinary, drawing from areas such as sociology, urbanism, geoecology, architecture, and political science, thus demonstrating that this research topic, which is now gaining full legitimacy in traditional fields, requires open and reflexive dialogues.