PALO ALTO (CBS SF) — Power was restored to nearly 7,000 Palo Alto residents and hundreds more in Lafayette who were experiencing a power outages in sweltering heat, on Monday.

The outage was mostly affecting South Palo Alto from Matadero Avenue to San Antonio Road and Middlefield to Deer Creek roads.

Catherine Elvert, spokeswoman for Palo Alto Utilities, said the outage stemmed from electrical equipment problems with a transformer at the Maybelle electrical substation.

Meantime, in Lafayette, about 700 customers were also without power Monday afternoon, according to PG&E. A power outage affected several traffic signals and an unknown number of East Bay utility customers.

Police said at 4 p.m. that PG&E was investigating the outage. Meanwhile they were asking drivers to be cautious in the downtown area, and to treat every intersection like a stop sign.

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