Where Illinois was allowed to regulate its own electricity generators, even if that regulation had an indirect affect on the price of electricity in regional electricity auctions.The 7th U.S. Circuit Court of Appeals affirmed a decision by U.S. District Judge Manish S. Shah.Regional transmission organizations manage the interstate electricity grids. Midcontinent Independent System Operator and PJM Interconnection handle the grid in and around the Midwest.Many large electricity generators sell most, if not all of their …