PJM Issues Hot Weather Alerts for June 29 to July 2


PJM has issued Hot Weather Alerts for June 29 to July 1 for the entire region it serves, and for July 2 for the Mid-Atlantic and Dominion regions of PJM. Hot Weather Alerts are issued when temperatures are expected to exceed 90 degrees Fahrenheit with high humidity.

Hot and humid weather is expected through the weekend and into next week, driving up the demand for electricity.

Forecast Peak Loads (as of 10:45 a.m. June 29)

  • June 29: 140,586 megawatts at 5 p.m.
  • June 30: 139,174 MW at 5 p.m.
  • July 1: 139,146 MW at 5 p.m.
  • July 2: 147,589 MW at 5 p.m.

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’s Summer Preparedness

PJM planners anticipate electricity use to peak at more than 150,000 megawatts this summer. The demand last summer peaked at 145,331 MW on July 19. PJM’s all-time highest power use was 165,492 MW in summer 2006.

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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