PG&E said more than 5,000 Livermore customers were without power on the scorching summer day.
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"We are surprised to see everything is closed," Anupam Dhopade said.
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Peet's Coffee employees asked customers to go home. "An hour into it they called PG&E and they said it's going to be out for the rest of the evening so they asked everybody to leave," Mani Talebi said.
With dozens of downtown Livermore businesses following suit, many of them leaving notes on doors apologizing to customers - there would be no Father's Day dinners served.
"We're going to look for some other place maybe in Dublin, Pleasanton area," Rosie Sahibzada said.
Looking for some other place was a theme Sunday with people escaping the heat where they lived to cool off in San Francisco, where record temps were still far lower than elsewhere.
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"It's too hot down there in the South Bay right now," San Jose resident Jonathan Vargas said.
"It's really nice to be here where it's a lot cooler in the breeze," Menlo Park resident Meghan Levin said.
With the heat wave expected to last all week - PG&E is recommending people conserve power between noon and 7:30 p.m.
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