Hot Weather Alert Issued for PJM Mid-Atlantic Region for May 22


PJM has issued a Hot Weather Alert for its Mid-Atlantic region for May 22 in advance of humid, near 90-degree weather.

A Hot Weather Alert is a routine procedure PJM issues ahead of forecasted 90-degree weather and/or high humidity in order to prepare transmission and generation personnel and facilities for expected increases in electricity demand. Temperatures in PJM’s Mid-Atlantic region are expected to approach 90 degrees with high humidity.

The Mid-Atlantic region is made up of the 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 & Rockland (Rockland Electric Company) transmission zones.

As of 8 a.m. on May 21, PJM’s forecasted peak for May 22 is approximately 118,000 MW.

Overall, PJM projects higher peak demand for electricity this summer at approximately 151,000 MW compared with the 2023 summer peak load of 147,000 MW. PJM’s all-time, one-day highest power use was recorded in the summer of 2006 at 165,563 MW. One megawatt can power about 800 homes.

Predicting the demand for electricity helps procure an adequate supply of power today and in the years ahead. Making these predictions – called load forecasting – is a job PJM does routinely, for both short- and long-term periods, to help acquire an adequate supply of power for reliable service at the most reasonable cost.

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. 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.