In this Aug. 15, 2020, photo, high voltage signs are posted on the Department of Water and Power Sub Station E in the North Hollywood section of Los Angeles. California residents may be asked to reduce electricity use this week to avert rolling blackouts amid a heat wave that threatens to strain the state's power grid. The California Independent System Operator, the nonprofit that runs the grid, said Tuesday, June 15, 2021, it should have enough electricity supply to meet demand and avert outages. (AP Photo/Richard Vogel) **FILE**
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