PJM Issues Oct. 2 Hot Weather Alert

Record fall heat-wave will impact Midwest, Mid-Atlantic, South


In the midst of a record-setting fall heat wave, PJM has issued a Hot Weather Alert for Wednesday, Oct. 2, for most of its footprint serving 65 million people. 

The alert will be in effect from 7 a.m. to 10 p.m. that day and covers all of the area served by PJM, except Northern Illinois. That includes all or parts of Delaware, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, Washington, D.C. and West Virginia.

Temperatures will climb 10 to 25 degrees above average through much of the week across the Ohio Valley, Mid-Atlantic and Northeast states, reaching the low 90s in many places and high 80s elsewhere, according to The Weather Channel. October temperature records could be set in Cincinnati and Columbus.

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

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 owners and generation operators to determine whether they can defer or cancel any maintenance or testing on their facilities.

Previous Hot Weather This Year

On Friday, July 19, PJM served a preliminary estimated peak load of over 152,000 MW, the highest yet this year.

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.