Judgment of the Court (Third Chamber) of 30 January 2025.#Engie România SA v Autoritatea Naţională de Reglementare în Domeniul Energiei.#Request for a preliminary ruling from the Tribunalul Bucureşti.#Reference for a preliminary ruling – Energy – Internal market in natural gas – Directive 2009/73/EC – Article 3(1) – Obligations of Member States towards natural gas undertakings – Consumer protection – Articles 40 and 41 – Powers of the regulatory authority – Breach by a natural gas undertaking of its duty of transparency towards consumers – Duplication of penalties for the same unlawful conduct – Article 50 of the Charter of Fundamental Rights of the European Union – Right not to be tried or punished twice in criminal proceedings for the same criminal offence – Ne bis in idem – Article 52(1) – Limitations on the exercise of that fundamental right – Principle of proportionality.#Case C-205/23.