Cold Weather Alert Expires for PJM Region


The cold weather alerts issued for the PJM footprint expired noon Tuesday as temperatures throughout the region began to moderate.

During the holiday weekend’s frigid weather, PJM served preliminary peak electricity usage of 116,618 MW at 8 p.m. Eastern time Sunday and 132,176 MW at 7 p.m. Eastern time Monday, without experiencing any operational issues or the need to call for emergency procedures.

The preliminary peaks are approximations calculated from raw telemetry data and do not reflect confirmed transaction information with market participants.

PJM also forecasted a peak of around 131,000 MW for Tuesday morning.

PJM’s confirmed all-time winter peak is 143,295 MW, set on Feb. 20, 2015.

A cold weather alert prepares personnel and facilities for expected extreme cold weather conditions, when actual temperatures fall near or below 10 degrees Fahrenheit, as they did in many of the 13 states served by PJM.

PJM communicates with generator owners and tells them to be prepared to call in additional staff to get all generating units running for the morning load pickup. They must take extra care to maintain the equipment so that it doesn’t freeze in the cold weather. During a cold weather alert, PJM also cancels or postpones planned maintenance outages to ensure the availability of resources.

Learn more about how PJM prepares for winter conditions on the PJM Learning Center.