PJM issues regional Hot Weather Alerts for Aug. 27–29


PJM has issued Hot Weather Alerts for Aug. 27–29 in the Mid-Atlantic and Dominion regions, and in the ComEd Region for Aug. 27. 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 on Aug. 28 – the hottest of the three days – of approximately 147,142 megawatts.

Peak use on Aug. 27 is expected to be about 142,971 MW; on Aug. 29, usage is predicted to peak at approximately 141,947 MW.

Demand last summer peaked at 145,331 MW on July 19. This year, demand climbed to nearly 150,000 MW on June 18.

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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