Order of the General Court (Third Chamber) of 6 September 2023.#Operator Gazociągów Przesylowych Gaz-System S.A. v European Union Agency for the Cooperation of Energy Regulators.#Action for annulment – Energy – Regulation (EU) 2017/459 – Capacity allocation mechanisms in gas transmission systems – Selection of gas transmission capacity booking platforms – ACER decision in the absence of agreement between the national regulatory authorities – Selection procedure by ACER – Conditions for ACER to resume the proceedings after referral back by the Board of Appeal – Scope and intensity of the Board of Appeal’s review of the legality of ACER decisions – Manifestly well-founded action.#Case T-212/20.