Hot Weather Alerts Issued for Mid-Atlantic Region


PJM has issued Hot Weather Alerts for Monday, July 29, and Tuesday, July 30, for the Mid-Atlantic region of the PJM footprint.

Temperatures are expected to exceed 90 degrees with high humidity in the area, which drives up the demand for electricity.

A Hot Weather Alert helps PJM and its utility partners coordinate the flow of energy and avoid capacity problems on the grid. PJM works with transmission and generation operators to determine whether they can defer or cancel any maintenance or testing on their facilities.

The PJM Mid-Atlantic region consists of the service territories of the following transmission owners: Atlantic City Electric, Baltimore Gas and Electric Company, Delmarva Power, Jersey Central Power & Light Co., Metropolitan Edison Co., PECO, Pennsylvania Electric Co., Pepco, PPL Electric Utilities, Public Service Electric and Gas Co., Rockland Electric Company and UGI Utilities.

Previous Hot Weather This Summer

On Friday, July 19, PJM served a preliminary estimated peak load of over 152,000 MW, the highest yet this year. On Saturday, July 20, PJM served an estimated peak of over 150,000 MW, a level that likely breaks PJM’s all-time high for a weekend day, when there is less commercial and industrial activity than a typical weekday.

How PJM Ensures Reliable Electricity in Hot Weather

PJM meets electricity needs by procuring enough resources to satisfy peak demand, plus required reserves, at the lowest cost through its competitive markets. PJM works with its members to ensure that power flows where it is needed and holds resources, such as generating plants, to strict standards to deliver electricity as promised.

PJM also has resources on reserve to cover generation that is unexpectedly unavailable or demand that is higher than forecasted. Track operations in real time: Track PJM’s markets and operations in real time on the Markets and Operations page on or through the PJM Now app for iPhone and Android. Learn more about how PJM prepares for summer operations on the Learning Center.