The Supreme Court has now sided with the challengers, ruling that the cost of adapting to these regulations should be taken into account.
Ethan Zindler, an analyst from Bloomberg New Energy Finance, told Take Two that most of the country’s power plants had already complied with the regulations but the few that haven’t will now be rethinking their plans going forward.
More info here: http://www.scpr.org/programs/take-two/2015/06/29/43448/supreme-court-says-epa-s-power-plant-regulations-g/