Case T-167/19: Judgment of the General Court of 6 October 2021 — Tempus Energy Germany and T Energy Sweden v Commission (State aid — Polish electricity market — Capacity mechanism — Decision not to raise any objections — Aid scheme — Article 108(2) and (3) TFEU — Concept of doubts — Article 4(3) and (4) of Regulation (EU) 2015/1589 — Serious difficulties — Article 107(3)(c) TFEU — Guidelines on State aid for environmental protection and energy 2014-2020 — Failure to initiate the formal investigation procedure — Procedural rights of the interested parties — Obligation to state reasons)