July 17 Update: Hot Weather Alert Extended to July 18 for PJM’s Mid-Atlantic and Southern Regions

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PJM has extended a Hot Weather Alert for its Mid-Atlantic and Southern regions to July 18 amid ongoing temperatures approaching 90 degrees. A Hot Weather Alert is already in effect for July 17 for these regions.

A Hot Weather Alert helps to prepare transmission and generation personnel and facilities for extreme heat and/or humidity that may cause capacity problems on the grid. Temperatures are expected to be near or above 90 degrees in these regions, which drives up the demand for electricity.

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 PJM Southern Region consists of Dominion Virginia Power’s service territory. As of the morning of July 17, PJM is expecting to serve a forecasted load approaching 135,000 MW on July 17 and around 131,000 MW on July 18.

Original Story: Mid-Atlantic, Southern Regions Under Hot Weather Alert for Monday, July 17 (Posted July 15)

PJM has issued a Hot Weather Alert for its Mid-Atlantic and Southern regions for Monday, July 17, in anticipation of temperatures above 90 degrees.

A Hot Weather Alert helps to prepare transmission and generation personnel and facilities for extreme heat and/or humidity that may cause capacity problems on the grid.

Temperatures are expected to be near or above 90 degrees in these regions, which drives up the demand for electricity. The Mid-Atlantic and Southern regions were also under a Hot Weather Alert on July 12 and July 13.

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 PJM Southern region consists of Dominion Virginia Power’s service territory. As of July 15, PJM is expecting to serve a forecasted load of approximately 134,000 MW on July 17.

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 PJM Southern region consists of Dominion Virginia Power’s service territory.

The forecasted summer peak demand for electricity is approximately 156,000 MW, but PJM has performed reliability studies at even higher loads – in excess of 163,000 MW.

PJM has approximately 186,000 MW of installed generating capacity available to meet customer needs, with sufficient resources available in reserve to cover generation that is unexpectedly unavailable or for other unanticipated changes in demand.

Last year’s peak demand was approximately 149,000 MW.

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.

Read more about how PJM forecasts electricity demand on the PJM Learning Center.