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Urban energy systems. Network Industries Quarterly, vol. 14, nos 2 &#38; 3, June 2012http://newsletter.epfl.ch/mir/newspaper-edition?np_id=46Urban energy systems face significant challenges in a fast urbanising world and at the same time technological development creates new opportunities for energy production and management in cities. This double issue is the third in the series focusing on urban infrastructures and covers different aspects of urban energy ranging from photovoltaics to smart grids and from energy demand management to the introduction of energy as alternative currency.Contents :Photovoltaics in urban energy systems in Europe: current policies and the need for policy change / Ralf Dyllick-Brenzinger and Matthias FingerUsing energy as currency: e-establishing the bridge between the financial and the real world / Sgouris SgouridisElectronics as a means of facilitating the shift towards the smart grid / Theodoros KyriakidisManaging urban energy demand / Afshin AfshariUrban energy initiatives: the implications of new urban energy pathways for the UK / Yvonne Rydin et al.Peer effect and social learning in micro-generation adoption and urban smarter grids development? / Richard Snape and Christophe RynikiewiczManagement of urban energy systems / Mélanie GuittetLTE take-up in the Baltic states and the European context: urban first / Edvins Karnitis, Andris Virtmanis, Gundega Rutka, Jans Jelinskis&#160;&#160;