The energy supply and demand system is of great importance for society, from economic, social, and ecological viewpoints. The last decade in particular has seen rapid changes in the world of energy systems, and it is therefore now an important area for study, academic research, and professional work. This textbook provides an introduction to energy analysis for those students who want to specialise in this challenging field. In comparison to other textbooks, this book provides a balanced treatment of complete energy systems, covering the demand side, the supply side, and the energy markets that connect these. The emphasis is very much on presenting a range of tools and methodologies that will help students find their way in analysing real world problems in energy systems. Featuring learning objectives, further readings and practical exercises in each chapter, An Introduction to Energy Analysis will be essential reading for upper-level undergraduate and postgraduate students with a background in the natural sciences and egineering. This book may also be useful for professionals dealing with energy issues, as a first introduction into the field.