The IEEE International Workshop on Intelligent Energy Systems (IWIES) aims at bringing together researchers from academia, industry, standardization and public authorities to discuss recent developments in architectures, concepts and algorithms for managing the increasing complexity in energy systems, especially in Smart Grids. IWIES 2013 is collocated with IECON 2013 - The 39th Annual Conference of the IEEE Industrial Electronics Society. These two conferences will hold concurrent sessions and joint activities, but each conference will publish its own proceedings. Participants can enjoy both IWIES and IECON conferences and receive both conference proceedings for a single registration fee. Today抯 power and energy systems are in a transformation process towards a smarter grid in order to cope with the large scale integration of Distributed Energy Resources (DER), Intelligent and Controllable Loads and E-vehicles. Advanced Information and Communication Technology (ICT) solutions and management concepts are one of the key enablers of the future Smart Grid. In order to cope with ever increasing complexity of the Smart Grid itself and its corresponding Cyber-Physical components and devices new architectures, concepts, algorithms, and procedures are necessary. The main objective of this workshop therefore is to bring the research and industry community together to discuss recent developments and approaches in the area of intelligent energy systems, and furthermore, enjoy beautiful Vienna.