The PJM Interconnection has issued a Hot Weather Alert for June 11–12 for the Mid-Atlantic and Southern regions ahead of expected 90-degree weather.
A Hot Weather Alert is a routine procedure PJM issues ahead of forecasted hot weather and/or high humidity to prepare transmission and generation staff and facilities for expected increases in electricity demand, or load, PJM said.
This procedure does not require any action from customers.
Temperatures are expected to reach and exceed 90 degrees with high humidity across the Eastern portion of the PJM footprint, driving increased electricity demand in those areas.
Forecasted Peaks
PJM is expecting to serve the following approximate peak loads on Thursday, June 11, and Friday, June 12:
Date Forecasted Peak Load
June 11 146,896 MW
June 12 140,840 MW
These numbers are official as of 1 p.m. on June 9, 2026. They are subject to change and will be updated periodically.
Impacted Regions
PJM’s Mid-Atlantic Region is made up of 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; and Orange and Rockland (Rockland Electric Company). PJM’s Southern Region is made up of the Dominion transmission zone.
"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. They prepare multiple potential scenarios that could be impacted by weather, emergency conditions or equipment failure," PJM said.
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.
