RWE Vertrieb AG v Verbraucherzentrale Nordrhein-Westfalen e.V.

(Directive 2003/55/EC – Internal market in natural gas – Directive 93/13/EEC – Articles 1(2) and 3 to 5 – Contracts between suppliers and consumers – General conditions – Unfair terms – Unilateral alteration by the supplier of the price of the service – Reference to mandatory legislation designed for another category of consumers – Applicability of Directive 93/13 – Obligation of use of plain and intelligible language and transparency)

REQUEST for a preliminary ruling under Article 267 TFEU from the Bundesgerichtshof (Germany), made by decision of 9 February 2011, received at the Court on 28 February 2011, in the proceedings

composed of A. Tizzano, President of the Chamber, A. Borg Barthet, M. Ilešič, M. Safjan (Rapporteur) and M. Berger, Judges,

having regard to the written procedure and further to the hearing on 28 June 2012,

– RWE Vertrieb AG, by P. Rosin, J. Schütze and A. von Graevenitz, Rechtsanwälte,