This book reports on the project “Pathways to Sustainable European Energy Systems”, a 5-year project (2006-2010) that has evaluated pathways to a sustainable European energy system, with a focus on the stationary energy system and the time period up to the year 2050. The present energy system has been included in the analysis, since this will have a significant influence on the possibilities to transform the energy system over the coming decades. Therefore, a cornerstone of the project has been the establishment of detailed databases concerning the European energy infrastructure, and including the global fossil fuel infrastructure. Taking departure in the description of the energy system as provided by the databases, different bridging technologies and measures have been identified, which can transform the energy system so that the emissions targets for year 2050 can be met. The work has been interdisciplinary and has involved some 40 researchers in addressing various aspects of the challenge to transform the energy system. The following chapters summarise the results from the various activities – in all more than 30 topics are covered. The aim of this book is to give an added value to the scientific publications that have emerged from the project. Each chapter gives references to key publications for the material and topics covered in that chapter. Chapter 7 - Chapter 19, http://www.energy-pathways.org/pdf/Pathways_page101-200.pdf Chapter 20 - Chapter 35, http://www.energy-pathways.org/pdf/Pathways_page201-304.pdf Chapter 36 - Researchers, http://www.energy-pathways.org/pdf/Pathways_page305-399.pdf