The UK model of incentive regulation of power grids was at one time the most advanced, and elements of it were adopted throughout the EU. This model worked well, particularly in the context of limited investment and innovation, a single and strong regulatory authority, and limited coordination between foreign grid operators. This enlightening book shows that since 2010 the whole context has changed and regulation has had to catch-up and evolve. The EU is entering a wave of investment, and an era of new services and innovation which has created growing tensions between national regulatory authorities in terms of coordinating technical standards and distribution systems. This is being played out against an increasingly disruptive backdrop of digitzation, new market platforms and novel business models.