PJM Issues Hot Weather Alert for Sept. 12


PJM has issued a Hot Weather Alert for Thursday, Sept. 12, for the entire region it serves.

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.

Generally, PJM issues a Hot Weather Alert when temperatures are expected to approach 90 degrees Fahrenheit or above; however, PJM can also issue the alert at lower temperatures when high humidity is anticipated.

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 load 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 PJM’s markets and operations in real time on the Markets and Operations page on PJM.com or through the PJM Now app for iPhone and Android. Learn more about how PJM prepares for summer operations on the Learning Center.