Hot Weather Alerts Extended for Mid-Atlantic and Dominion Regions


Excessive heat continues today as temperatures reach as high as 98 degrees in parts of the Eastern Seaboard. PJM Interconnection, the operator of the nation’s largest electric grid, expects to reach peak electrical usage of approximately 151,000 megawatts today across 13 states and the District of Columbia.

Power use for Tuesday is expected to reach approximately 149,000 MW.

PJM declared Hot Weather Alerts for the entire region over the weekend, and for today (July 2) and tomorrow for the Mid-Atlantic and Dominion regions. The alerts help PJM and utility partners coordinate the flow of energy and avoid capacity problems on the grid.

Weekend Preliminary Peak Loads

  • June 29: 140,815 MW at 6 p.m. Eastern
  • June 30: 139,912 MW at 6 p.m. Eastern
  • July 1: 141,205 MW at 5 p.m. Eastern

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

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