(February 13, 2017, 9:11 AM EST) -- CHICAGO — A federal trial court erred when it dismissed, for lack of subject matter jurisdiction, a class suit accusing an alternative retail electric supplier of attracting new customers by advertising one price and charging them another, a Seventh Circuit U.S. Court of Appeals panel ruled Feb. 8 (Peggy Zahn v. North American Power & Gas, LLC, No. 15-2332, 7th Cir., 2017 U.S. App. LEXIS 2256)....