Illinois' mandate for electric distribution companies to buy "zero emissions credits" from two nuclear power plants owned by Exelon Corp. has drawn challenges from competing electric producers, who say that the program unlawfully interferes with the wholesale markets. FERC said that the legal challenge should be dismissed because the subsidies fall outside of the agency's jurisdiction, just as with state renewable energy credit programs. The case comes after the U.S District Court for the Northern District of Illinois dismissed in July a lawsuit by Calpine Corporation, Dynegy Inc., NRG Energy Inc., Eastern Generation LLC and the Electric Power Supply Association. The case is Village of Old Mill Creek, et al. v. Anthony Star, et al. (17-2445)