Joined Cases C-473/17 and C-546/17: Judgment of the Court (First Chamber) of 11 April 2019 (Requests for a preliminary ruling from the Tribunal Supremo — Spain) — Repsol Butano SA (C-473/17), DISA Gas SAU (C-546/17) v Administración del Estado (Reference for a preliminary ruling — Energy — Liquefied petroleum gas (LPG) sector — Consumer protection — Requirement of general economic interest — Maximum price of a bottle of gas — Home delivery obligation — Article 106 TFEU — Directives 2003/55/EC, 2009/73/EC and 2006/123/EC — Interpretation of the judgment of 20 April 2010, Federutility and Others (C-265/08, EU:C:2010:205) — Principle of proportionality)