During a Flex Alert, people are asked to keep their air conditioning thermostats no lower than 78 degrees.By CBSLA Staff


LOS ANGELES (CBSLA) – This Labor Day Weekend, California is being placed under yet another round of Flex Alerts because of the sizzling heat wave that is descending on the region.

Electrical power line towers are seen in Los Angeles on Aug. 19, 2020, during a triple-digit heatwave. (Getty Images)

However, while most Californians have undoubtedly heard the term, they may be unclear what it actually means.

Flex Alerts are issued by the California Independent System Operator (Cal ISO), an independent, nonprofit agency which oversees the state’s power grid.

They are issued when temperatures are expected to be so high that they prompt a subsequent increase in energy use that could potentially stress the power grid, causing outages or forcing rolling blackouts.

Cal ISO tracks the usage in real-time to give Californians an idea when the power grid could be reaching its limit. For example, as of noon Friday, the state was using 31,641 megawatts of power, well below its capacity of 49,794 megawatts.

Flex Alerts are designed to prevent that stress by asking residents to voluntarily conserve energy during the hottest and highest usage periods of the day.

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“The ISO recognizes that reducing energy use during the hot time of the day is a hardship, especially for those working from home or for families with children schooling at home. However, if a large enough number of consumers conserve even in small ways, they can help grid operators avoid more serious system emergencies,” Cal ISO explained in a news release Thursday.

During a Flex Alert, people are asked to keep their air conditioning thermostats no lower than 78 degrees and limiting the use of major appliances, such as washing machines and dishwashers. They should also turn off lights and unplug cell phone chargers when not in use.

Cal ISO has issued a Flex Alert that will run between 3 p.m. and 9 p.m. on Saturday, Sunday and Monday.

There were several Flex Alert days in mid-August due to a heat wave which lasted over a week and forced California to implement its first rolling blackouts since 2001. During one period on Aug. 15, Southern California Edison reported that about 70,000 customers were affected by rolling blackouts from Santa Monica to Woodland Hills.

While the L.A. Department of Water and Power was spared from rolling blackouts because it owns it own power plants and transmission lines, it still experienced power outages. On Aug. 18, more than 12,000 LADWP customers lost electricity due to stress on the utility’s power grid.

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