PLEASANTON (CBS SF) — Thousands of homes and businesses in Pleasanton were without power on one of the hottest days since the start of summer, on Tuesday afternoon.

The outage affected more than 7,000 customers, according to PG&E. It was first reported at around 3:30 p.m.

READ MORE: Seaside Man Charged With 1991 Cold Case Murder Of Lloyd Joseph Perkins Jr

(PG&E)

Temperatures in Pleasanton climbed into the upper 80s Tuesday.

READ MORE: Raiders Owner Mark Davis Defends Posting 'I Can Breath' Tweet Following George Floyd Verdict

PG&E says they were investigating and assessing the cause.

As of 7:30 p.m., power was restored to about 5,000 homes.

MORE NEWS: Burglary Suspect Arrested After Police Find Him Hiding Inside SSF Home

The utility estimated that power will be fully restored around 11 p.m.