California Gov. Declares State Of Emergency Over Fires Amid Heat Wave

California is battling multiple wildfires amid a severe heat wave, straining resources and causing rolling blackouts. The SCU Lightning Complex Fire, a group of 20 lightning-caused fires, has burned 35,000 acres across five counties. Firefighters have contained only 4% of the flames. Governor Newsom announced collaboration with federal and local partners to address the crisis. The heat wave has led to the first rolling blackouts in 19 years, affecting nearly 42 million residents under a heat warning.

What significant weather event is affecting California according to the text?

What impact did the heat wave have on California's power grid?