June 13 Update: Hot Weather Alert Extended to June 14 for PJM Mid-Atlantic and Southern Regions

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PJM has extended a Hot Weather Alert to June 14 for PJM’s Mid-Atlantic and Southern regions ahead of continued forecasted hot weather. A Hot Weather Alert is currently in effect for June 13 for the entire region PJM serves.

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 and Southern regions 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. The Southern region is made up of the Dominion transmission zone.

As of 8 a.m. on June 13, PJM’s forecasted peak for June 13 is approximately 131,000 MW and for June 14 is approximately 124,000 MW.

Original Story (June 12): PJM Issues Hot Weather Alert for June 13

PJM has issued a Hot Weather Alert for its entire service area, which includes all or parts of 13 states and the District of Columbia, for June 13 ahead of expected 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 are expected to reach the 90s throughout the PJM footprint, which increases demand for electricity.

As of 9 a.m. Eastern on June 12, PJM’s forecasted peak for June 13 is approximately 130,000 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.