PJM Issues Hot Weather Alerts for Sept. 4-6


PJM has issued Hot Weather Alerts for Tuesday and Wednesday throughout its 13-state region and through Thursday in the Mid-Atlantic and Dominion regions. Temperatures in these areas are forecasted to climb above 90 degrees amid high humidity, driving up the demand for electricity.

PJM expects to reach peak electrical demand of 151,127 megawatts at 4 p.m. on Tuesday (Sept. 4) and approximately 148,506 megawatts on Sept.  5.

Based on preliminary estimates, electrical usage reached its highest point this year at 5 p.m. Eastern on Aug. 28, peaking at more than 151,000 megawatts across the PJM service area.

Last summer, demand peaked at 145,331 MW. PJM’s all-time highest power use was 165,492 MW in summer 2006. PJM has committed capacity of 184,101 MW.

Hot Weather Alerts help PJM and utility partners coordinate the flow of energy and avoid capacity problems on the grid.

What Is a Hot Weather Alert?

A Hot Weather Alert prepares transmission or generation personnel and facilities for extreme hot and/or humid weather conditions that may cause capacity problems on the grid. Transmission and generation operators determine if any maintenance or testing on their facilities can be deferred to a later date or even canceled.

PJM serves 65 million people in all or parts of 13 states and the District of Columbia.

The PJM Mid-Atlantic Region consists of the service territories of the following transmission owners: Atlantic City Electric, Baltimore Gas and Electric Company, Delmarva Power, Jersey Central Power & Light Co., Metropolitan Edison Co., PECO, Pennsylvania Electric Co., Pepco, PPL Electric Utilities, Public Service Electric and Gas Co., Rockland Electric Company and UGI Utilities.

PJM meets electricity needs by procuring enough resources to satisfy peak demand plus required reserves at the lowest reasonable cost through its competitive markets. PJM works with its members to ensure that power flows where it is needed, and holds resources such as generating plants to strict standards to deliver electricity as promised.

PJM also has resources on reserve to cover generation that is unexpectedly unavailable or demand that is higher than forecasted.

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