PJM, operator of the nation’s largest electrical grid and wholesale electricity market, on Thursday issued a cold weather alert for Friday for the Western Region of the PJM footprint.
The Western Region includes all or parts of Illinois, Indiana, Kentucky, Maryland, Michigan, Ohio, Pennsylvania Tennessee, Virginia and West Virginia.
Temperatures are expected to reach the single digits in some areas of PJM Friday, with the coldest temperatures expected in Illinois, which is served by Commonwealth Edison.
As of 11 a.m. Thursday, electricity demand is expected to reach about 115,000 MW by Friday evening.
The cold weather alert is expected to expire at midnight Saturday.
What Is a Cold Weather Alert?
A cold weather alert prepares personnel and facilities for expected extreme cold weather conditions, when actual temperatures fall near or below 10 degrees Fahrenheit.
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.