Aug. 10 Update: Hot Weather Alert Expanded to Entire PJM Footprint for Aug. 11

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PJM has issued an additional Hot Weather Alert for the entire region it serves for Aug. 11 because of anticipated hot and humid weather.

Temperatures are anticipated to go above 90 degrees with high humidity, which drives up the demand for electricity.

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.

The ComEd and Mid-Atlantic regions of the PJM footprint are currently under a Hot Weather Alert for Aug. 10.

The preliminary peak electricity usage for Monday, Aug. 9, was approximately 133,500 MW. The peak for Tuesday, Aug. 10, is forecast to be around 142,000 MW.

Aug. 9 Update: Additional Hot Weather Alert Issued for Aug. 10 for Mid-Atlantic and ComEd Regions

PJM has issued an additional Hot Weather Alert for Aug. 10 for its Mid-Atlantic and ComEd regions.

Temperatures are anticipated to go above 90 degrees with high humidity, which drives up the demand for electricity.

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.

The Mid-Atlantic region includes 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.

PJM previously issued a Hot Weather Alert for Aug. 9 for all of the PJM footprint, except for the ComEd and Dominion regions.

Original Story: PJM Issues Hot Weather Alert for Aug. 9 (Published Aug. 6)

PJM has issued a Hot Weather Alert for Aug. 9 throughout most of its footprint, which includes 13 states and Washington, D.C.

The alert, in effect from 7 a.m. to 10 p.m. Monday, does not include the ComEd transmission zone in northern Illinois and Dominion transmission zone in Virginia.

Temperatures are anticipated to go above 90 degrees with high humidity, which drives up the demand for electricity.

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. 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.