PJM Continues Vigilance as Heat Wave Continues

solar flare GMDThis is an updated version of a story posted earlier in Inside Lines.

PJM has issued Hot Weather Alerts for the Mid-Atlantic and Dominion Regions for Tuesday, July 26, and Wednesday, July 27. No problems are expected at this time.

“We’re pleased to see the system working well, but we’re staying vigilant while the heat wave continues,” said Mike Bryson, vice president – Operations.

“While this is the hottest weather we have had in the past few years, we are still well below our all-time peak and capacity ability,” said Bryson. “The performance of both the members systems and the PJM system was very strong today. Our regional diversity was particularly helpful in reducing the impact of hot weather.”

Additionally, the Hot Weather Alert called for today for the Mid-Atlantic and Dominion Regions has been expanded to include the entire PJM footprint.

The alerts were called because temperatures are forecast to be above 90 degrees Fahrenheit with high humidity.

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/generation operators determine if any maintenance or testing on their facilities can be deferred to a later date or even canceled.

Hot Weather Alerts do not trigger PJM’s Capacity Performance Assessment Hours for capacity resources, which PJM uses to assess a generator’s performance during selected emergency actions.

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.