Power officials are urging people not to charge their electric vehicles during peak hours during this heat wave as they extended a Flex Alert Thursday.

The state has been encouraging everyone to drive electric cars to help with climate change. But in this super hot climate right now, residents are being asked to be careful about when they charge to reduce the risk that they’ll lose power altogether.

On Thursday, some drivers said they could avoid charging their cars between 4 and 9 p.m. at what Pasadena calls it the nation’s largest EV public charging station— while others said holding off would be difficult.