Case T-127/21 RENV: Judgment of the General Court of 4 February 2026 – Swissgrid v Commission (Energy – European platforms for the exchange of standard products for balancing energy – Switzerland’s participation – Article 1(6) and (7) of Regulation (EU) 2017/2195 – Letter from the Commission refusing to authorise the Swiss transmission system operator to participate in the platforms – Action for annulment – Challengeable act – Continuing interest in bringing proceedings – Locus standi – Admissibility – Lack of competence of the author of the act)