The multiple faces of energy security : an introduction / Kacper Szulecki -- Part I. Internal EU dynamics of energy securitisation : divergent perceptions -- Energy securitization : applying the Copenhagen school's framework to energy / Andreas Heinrich and Kacper Szulecki -- Securitization in the gas sector: energy security debates concerning the example of the Nord Stream pipeline / Andreas Heinrich -- Politics and knowledge production : between securitization and riskification of the shale gas issue in Poland and Germany / Aleksandra Lis -- Energy security and energy transition : securitisation in the electricity sector / Kacper Szulecki and Julia Kusznir -- Energy securitization : avenues for future research / Andrew Judge, Tomas Maltby and Kacper Szulecki -- Part II. Europe's external policy challenges : critical perspectives on energy security -- Taking security seriously in EU energy governance? Crimean shock and the energy union / Kacper Szulecki and Kirsten Westphal -- Unpacking the nexus between market liberalisation and desecuritisation in energy / Irina Kustova -- EU gas supply security : power of the importer / Jakub M. Godzimirski and Zuzanna Nowak -- Identities and vulnerabilities : the Ukraine crisis and the securitization of the EU-Russia gas trade / Marco Siddi -- Positive and negative security : a consequentalist approach to EU gas supply / Paulina Landry -- The global oil market and EU energy security / Dag Harald Claes.