The Sunrise Powerlink was crucial during the five-day heat wave. Photo courtesy SDG&E
The Sunrise Powerlink, a key power link for San Diego. Photo courtesy SDG&E

With a heat wave gripping parts of Southern California, the manager of the state’s energy grid has issued a “flex alert,” urging residents to conserve electricity between 2 p.m. and 9 p.m. to reduce strain on the system.

Parts of the Los Angeles area will see highs in the 100s, while San Diego will be cooler but muggy. The National Weather Service forecast calls for partly cloudy conditions with highs 73 to 78 along the coast to 80 to 85 inland. Afternoon thunderstorms are possible.

The flex alert went into effect Tuesday and was to remain in effect through Wednesday, according to the California Independent System Operator.

“Consumers are urged to reduce their energy use during the late afternoon when air conditioners drive consumption to the highest point of the day,” according to the alert.

According to Cal-ISO, a flex alert is issued when the state’s power grid is under stress due to elevated demand or transmission system outages. The alerts call for voluntary conservation so the state will not have to dip into energy reserves.

Cal-ISO predicted peak energy demand for the day to hit 44,700 megawatts around 6 p.m.

The agency offered a series of tips for conserving energy:

  • Set thermostats at 78 degrees or higher and turn air conditioners off when away
  • Switch off lights when leaving a room
  • Avoid using appliances during peak hours, particularly from 4 to 6 p.m.
  • Reset pool pumps to run during off-peak hours
  • Turn off computer monitors at work while away from the desk, and switch off lights and coffee makers

City News Service contributed to this article.

Chris Jennewein is Editor & Publisher of Times of San Diego.