"The alert is also targeted at transmission/generation owners, who then determine if any maintenance or testing on equipment can be deferred or canceled," PJM said, adding, "By deferring maintenance, the units stay online and continue to produce energy that is needed."

PJM posted on X that electricity usage is expected to reach 151,485 megawatts by 5 p.m. today (Eastern Time). The good news is that the grid has about 161,643 megawatts of spare capacity available. This spare capacity will act as a buffer to prevent rolling blackouts during peak evening usage.