In South Branch LLC v. Commonwealth Edison Co., Nos. 21-2861, 21-2872 & 21-2873, 2022 WL 3581782 (7th Cir. Aug. 22, 2022), two judges on a Seventh Circuit panel led by Judge Diane Sykes reached for an immunity that the trial court did not touch to bar claims against ComEd:  the filed rate doctrine.