(Bloomberg) -- California’s grid operator asked consumers to conserve power, the latest such request to ease soaring electricity demand amid hot weather.

The California Independent System Operator called for voluntary conservation Wednesday from 4 p.m. to 9 p.m., citing high energy demand as residents crank up air conditioners and tight supplies across the West.

Dangerous heat has repeatedly strained the Golden State’s grid this year, prompting repeated pleas from officials asking for reduced electricity use to avoid blackouts. It’s increasingly becoming California’s new normal.

READ: California’s New Summer Normal: Use Less Power and Water

The state’s power grid tends to face the most strain in late afternoon and evening, when solar power supplies decline during the hottest parts of the day.

Temperatures in Central Valley cities from Sacramento to Fresno are forecast to top 100 degrees Fahrenheit (38 degrees Celsius) through Friday, according to the National Weather Service. Highs in Los Angeles will be in the mid-80s.

By early next week, temperatures could soar again across California, the Pacific Northwest and even British Columbia in a pattern reminiscent of June’s record heat waves, said Jim Rouiller, lead meteorologist with the Energy Weather Group. That could strain the grid through mid-week, he said.

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