Aug. 25 Update: Hot Weather Alert Extended to Aug. 26 for Most of PJM Footprint

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PJM has extended a Hot Weather Alert through Aug. 26 for all but the ComEd region of the PJM footprint as hot and humid weather continues.

A Hot Weather Alert is already in effect for Aug. 25 for the entire region PJM serves.

Peak electricity demand for Aug. 25 is forecast at approximately 150,000 MW. The forecast peak for Aug. 26 is around 146,000 MW. The preliminary peak for Aug. 24 was around 149,500 MW, occurring between 5–6 p.m. EDT.

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. PJM works with transmission and generation operators to determine if they can defer or cancel any maintenance or testing on their facilities.

Aug. 24 Update: RTO-Wide Hot Weather Alert Extended to Aug. 25

PJM has extended a Hot Weather Alert through Aug. 25 for its entire footprint amid forecasts of high temperatures and humidity.

Temperatures are expected to be above 90 with high humidity, which drives up the demand for electricity.

Peak electricity demand for Aug. 24 is forecast at approximately 149,000 MW. The forecast peak for Aug. 25 is around 150,000 MW.

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. PJM works with transmission and generation operators to determine if they can defer or cancel any maintenance or testing on their facilities.

Original Story: Hot Weather Alert Issued for Aug. 24 (Posted Aug. 23)

PJM has issued a Hot Weather Alert for Aug. 24 for its entire footprint with high temperatures and humidity returning to the region.

Temperatures are expected to be in the low to mid 90s with high humidity, which drives up the demand for electricity.

Peak electricity demand for Aug. 24 is forecast at approximately 145,000 MW.

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. PJM works with transmission and generation operators to determine if they can defer or cancel any maintenance or testing on their facilities.

Preparing for Summer Demand

PJM power system operators have forecasted a peak demand for electricity this summer at approximately 149,000 MW but have performed reliability studies at even higher loads – in excess of 155,000 MW – for the region. PJM has over 185,000 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.

PJM’s all-time highest power use was 165,563 MW in the summer of 2006. The highest peak for this summer was just under 149,000 MW on Aug. 12, according to preliminary PJM estimates. One megawatt can power about 800 homes.

Track Operations in Real Time

Track PJM’s markets and operations in real time on the Markets and Operations page on PJM.com or through the PJM Now app for iPhone and Android.

Learn more about how PJM prepares for summer operations on the Learning Center.