California ISO Issues Statewide Flex Alert Due to Heat Wave

The following news release was issued by the California Independent System Operator today:

Today, the California Independent System Operator (ISO) issued a statewide Flex Alert, calling for voluntary electricity conservation from 2 to 9 p.m. The California ISO is the statewide operator of the power grid managing the flow of electricity across the high-voltage, long-distance power lines.

Consumers are urged to conserve electricity especially during the late afternoon when air conditioners typically are at peak use. Consumers can help by turning off all unnecessary lights, using major appliances before 2 p.m. and after 9 p.m., and setting air conditioners to 78 degrees or higher. 

While this is a statewide call for voluntary conservation, SDG&E does not foresee any issue with meeting the needs of our customers today or over the course of the week. Extreme temperatures are being felt throughout Central and Northern California, so doing our part to help relieve stress on the grid always helps.

For more electricity conservation tips, visit the ISO’s Flex Alert website at

Conservation Tips

  • Set thermostat at 78° F or higher and turn off, if away
  • Cool with fans and draw drapes
  • Turn off unnecessary lights and appliances
  • Use major appliances in morning or late evening

What is a Flex Alert?

A Flex Alert is issued by the ISO when the electricity grid is under stress because of generation or transmission outages, or from persistent hot temperatures.

Consumers are urged to voluntarily conserve electricity to help avoid more serious steps to protect the power grid, including local rotating outages. However, take no action that threatens your health and safety.

Click here to learn more about Flex Alerts and Stage Electrical Emergencies.

Flex Alerts are part of an educational alert program that informs consumers about how and when to conserve electricity. Media funding by Southern California Gas Company and authorized by the California Public Utilities Commission.