SACRAMENTO (CBS13) — A statewide Flex Alert is in place as temperatures spiked across Northern California Wednesday.

Hot weather is returning to the region and is expected to stick around through Friday. Triple-digit heat is forecasted across the Central Valley, according to the National Weather Service.

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In anticipation of the sharp increase in electricity demand from air conditioners, the California Independent System Operator says the Flex Alert will be in effect from 4 p.m. to 9 p.m.

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California residents are being urged to try and reduce their electricity use during that time by setting thermostats at 78 degrees or higher and refraining from using major appliances.

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Rotating power outages are possible if electricity use exceeds the supply.