The Sierra Club intervened in the case on the EPA's side. Whitney Pearson, associate organizing representative for the group's Beyond Coal campaign, said the Sierra Club was disappointed with the stay.
“This safeguard would go a long way to restore clean, healthy air to Oklahoma's communities,” Pearson said. “However, this is only a temporary setback, and we are optimistic that the safeguard is well supported by scientific and medical evidence, and that it will be upheld this fall after the court has the opportunity to review the merits of the case.”
Pearson called on OG&E to follow PSO's lead in retiring its Oklahoma coal plants.
The EPA said it would determine the “appropriate next steps” after reviewing the court's decision.