Nearing the end of one of the harshest winters in its history, PJM is considering requiring winter testing of generators.

PJM’s dispatch of demand response helped avoid the need to shed load during the polar vortex Jan. 7, when the RTO set a new winter demand record of about 141,500 MW.

Sub-zero temperatures from Toledo to Tennessee pushed PJM to its limits last week as the RTO overcame the loss of nearly 40,000 MW of generation during an arctic blast that set a new winter demand record.