The future judgement in Joined Cases C -204-208 / 12 Essent Belgium N.V. v. Vlaamse Reguleringsinstantie voor de Elektriciteits - en Gasmarkt could very well be one of those landmark cases in which the CJEU clarifies one of
the fundamental doctrinal issues in internal market law: can Member States rely upon the rule of reason to justify distinctly applicable measures?