Californians are being advised not to charge their electric cars between 4 and 9 PM due to a 90-degree heatwave  

The California Independent System Operator (ISO) has requested that citizens ‘reduce’ their energy usage between 4 and 9 p.m., ‘when the system is most stressed since the demand for power remains high.’

Beginning Wednesday and ending Tuesday, Residents are advised to limit their power consumption 

“The top three conservation actions are to set thermostats to 78 degrees or higher, avoid using large appliances and charging electric vehicles, and turn off unnecessary lights,” the American Public Power Association said, asking residents to limit energy usage during 4 p.m. and 9 p.m.

“Today, most people charge their electric cars when they come home in the evening — when electricity demand is typically at its peak,” according to Cornell University’s College of Engineering. “If left unmanaged, the power demanded from many electric vehicles charging simultaneously in the evening will amplify existing peak loads, potentially outstripping the grid’s current capacity to meet demand.”

The decision comes only weeks after the California Air Resources Board imposed regulations, requiring automakers to sell only cars that rely on electricity or hydrogen by 2035.