The 7th FSR & BNetzA Forum on Legal Issues of Energy Regulation took place on 6 February 2015 at the Berlin Office of Linklaters LLP. Organised on a yearly basis, the Forum is a joint initiative of the Energy Law & Policy Area of the Florence School of Regulation (FSR) and the German energy regulator, Bundesnetzagentur (BNetzA), aimed to foster discussion on issues of particular importance for national regulatory authorities. This year, the Forum brought together over fifty experts from regulatory authorities, governments, EU institutions, law firms, consultancies and energy companies, and provided an excellent platform for knowledge and practice sharing among professionals dealing with different aspects of energy market regulation on a daily basis. Discussions centred around three main themes: certification of transmission system operators (TSOs), new challenges facing distribution system operators (DSOs), and cooperation between national energy regulators regarding interconnectors and the EU projects of common interest (PCIs). As Kai Uwe Pritzsche from Linklaters’ Berlin office remarked in his introduction, issues arising from the energy transformation occur in all Member States of the European Union (EU), and there is a great potential to learn from each other and work together to tackle the new challenges of evolving energy markets.