The grid operator that run’s America’s largest power market denounced a request from utility First Energy Thursday for an emergency order to save nuclear and coal power plants across the Midwest.

“This is not an issue of reliability,” PJM Interconnection said. “There is no immediate emergency. Diversity of the fuel supply is important, but the PJM system has adequate power supplies and healthy reserves in operation today, and resources are more diverse than they have ever been. Nothing we have seen to date indicates that an emergency would result from the generator retirements.”