Hot Weather Alerts Issued for Mid-Atlantic and Southern Regions


PJM has issued Hot Weather Alerts for June 27–29 in the Mid-Atlantic and southern regions of its footprint. Temperatures are expected to go above 90 degrees amid high humidity, which drives up the demand for electricity.

PJM expects electricity use to peak toward the end of the week at around 140,000 megawatts.

PJM has a committed capacity of 183,454 MW available to meet customer demand.

Last summer’s peak demand was 150,830 MW, which occurred on August 28. PJM’s all-time highest power use was 165,563 MW in the summer of 2006. One megawatt can power about 800 homes.

What Is a Hot Weather Alert?

A Hot Weather Alert helps PJM and utility partners coordinate the flow of energy and avoid capacity problems on the grid.

It prepares transmission and generation personnel and facilities for extreme heat and/or humidity that may cause capacity problems on the grid. PJM works with transmission and generation operators to determine if 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.

The PJM southern region consists of Dominion Virginia Power’s service territory.

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.