Two months since Illinois lawmakers and Gov. Bruce Rauner signed off on a bailout bill they said was needed to ensure the viability of two Exelon nuclear electricity plants, two lawsuits filed in federal court have challenged the constitutionality of the legislation, alleging the law effectively rigs in Exelon’s favor wholesale electricity generation and supply markets, resulting in a windfall estimated to be worth at least hundreds of millions of dollar for Exelon over the next 10 years, paid for by Illinois businesses and households.