Clarifying the divide between delegated and implementing acts?

On 18 of March 2014 the Court of Justice delivered its judgment in the European Chemicals Agency (ECHA) fees case, the first case dealing with the problematic distinction, in practice, between delegated acts under Article 290 Treaty on the Functioning of the European Union (TFEU) and implementing acts under Article 291 TFEU. The significance of this case should be searched for in the fundamental changes brought to the hierarchy of norms and the EU’s revamped arsenal of acts after the Lisbon Treaty. These changes will first be recalled before presenting the case itself.