Case T-883/16: Judgment of the General Court of 10 September 2019 — Poland v Commission (Internal market in natural gas – Directive 2009/73/EC – Commission Decision approving the variation of the conditions for the exemption from EU requirements of the rules governing the operation of the OPAL pipeline with regard to third party access and tariff regulation – Article 36(1) of Directive 2009/73 – Principle of energy solidarity)