
The California Independent System Operator declared a Stage 2 Emergency Sunday.
While there were similar warnings for last Friday and Saturday, the Creek Fire has knocked a major power plant offline, meaning the power grid is more strained for resources than it has been.
ISO grid operators report Sunday will be the "most challenging" of the heatwave for the electricity system.
The ISO has already issued a Flex Alert for Monday from 3 p.m. to 9 p.m.