Extreme Heat Across State Activates Flex Alert

Summer isn’t over yet. Judging by this weekend’s forecast and beyond, there is minimal relief in sight.

The California Independent System Operator (Cal ISO) issued a statewide Flex Alert today that calls for voluntary electricity conservation from 1 p.m. to 10 p.m. on Friday, September 1. Consumers are urged to conserve electricity especially during the afternoon when air conditioners typically are at peak use, as well as turn off all unnecessary lights, use major appliances before 1 p.m. and after 10 p.m., and set air conditioners to 78 degrees or higher to avoid any interruptions.

Forecasts now project record demand load on Friday and all available resources are ready to respond. The ISO’s service territory serves about 80 percent of California’s electricity consumers.

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.

Conservation tips include:

  • Set thermostat at 78 degrees 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

A grid operator monitors the daily forecast and has the ability to notify businesses, local governments, residents and state agencies by media reports or emails. These alerts are typically regionally targeted and grid operators can shift energy resources within different regions to handle anticipated demands.

Extreme Heat Warning

The majority of the state will be under an “extreme heat warning” for Labor Day weekend, while hot temperatures will continue near the central coast early next week. Prolonged extreme heat will peak this weekend in the Sacramento Valley with slow moderation beginning Monday. Highs in the Sacramento Valley are expected to exceed 110 degrees, however the usual overnight cool-off will be non-existent with lows remaining in the mid-70s to 80 degrees in interior valleys and the Los Angeles Basin.
Fire danger risks remain heavy throughout the state, specifically in the Northern California mountains. Isolated scattered showers and thunderstorms are possible in the Southern California deserts and mountains today.

Get Flex Alert Notifications

  • If you want to be notified immediately of a Flex Alert, click here.


Additional Resources

Jonathan Gudel

Jonathan Gudel is a Public Information Officer for the California Governor's Office of Emergency Services (Cal OES). Since joining Cal OES, he has assisted in the response and recovery efforts of the Aliso Canyon Gas Leak, the state's historic drought, the Oroville Dam Emergency Spillway Incident, unprecedented winter storms in 2017, the October (Sonoma County) and December (Santa Barbara County) 2017 wildfires, and statewide wildfire siege in 2018 . Previously, he worked in the newspaper industry for 12 years.

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