Send us Fan Mail Your lights do not go out only because of storms or hackers. Sometimes they go out because the grid is being asked to do more than it was built to do, and the strain is already showing up during extreme heat. I walk through a recent, real-time grid emergency on the PJM Interconnection system where demand pushed into record territory and the Department of Energy issued emergency orders to keep the system stable. That detail matters because it turns “someday” risk into “this ju...