Case T-607/20: Judgment of the General Court of 15 February 2023 — Austrian Power Grid and Others v ACER (Energy — Internal market in electricity — Framework for the European platform for the exchange of balancing energy from frequency restoration reserves with manual activation — Procedure for the adoption of terms, conditions and methodologies — Rejection of the joint proposal of the system operators — Competence of ACER — Error of law — Rights of the defence — Obligation to state reasons)