The PJM Interconnection has issued a Hot Weather Alert for May 18 for the entire region it serves and for May 19 for PJM’s Mid-Atlantic and Southern regions.
A Hot Weather Alert is a routine procedure PJM issues ahead of forecasted hot weather and/or high humidity to prepare transmission and generation personnel and facilities for expected increases in electricity demand, or load.
This procedure does not require any action from customers.
Temperatures are expected to reach and exceed 90 degrees over the early part of the week, driving increased electricity demand.
PJM’s Southern Region is made up of the Dominion transmission zone. The Mid-Atlantic Region is made up of the following transmission zones:
• Atlantic City Electric
• Baltimore Gas and Electric
• Delmarva Power & Light
• Jersey Central Power & Light
• Met-Ed
• Penelec
• PECO Energy
• Pepco
• PPL Electric Utilities
• PSE&G
• Orange & Rockland (Rockland Electric Company)
Forecast Peaks
As of May 14, 2026, PJM was expecting to serve the following approximate peak loads on May 18 and 19:
- May 18, Forecast Peak Load: 129,308 MW
- May 19, Forecast Peak Load: 128,885 MW
These numbers are official as of 1 p.m. on May 14, 2026. They are subject to change and will be updated periodically, the grid operator said.
Additional Actions
PJM also issued a Maintenance Outage Recall on May 14 ahead of the week’s forecasted hot weather. The recall requests for all maintenance outages to be returned to service by May 18 to increase the amount of generation available to meet customer demand.
"A dedicated team of operators uses sophisticated technology to balance supply and demand and direct the power grid 24/7 from PJM’s control rooms," PJM said.
"They prepare multiple potential scenarios that could be impacted by weather, emergency conditions or equipment failure. They adjust resource output with changes in demand and ensure that no transmission lines or facilities are overloaded. The team also watches for unusual conditions and reacts to them to protect the electricity supply."
