(KRON) — About 143 customers remain without power in Santa Clara following an earlier outage that left thousands without power Monday morning after squirrels chewed through an electric cable, according to Silicon Valley Power. The outage was first reported shortly before 9 a.m. Monday.

The outage, in the western part of the city, impacted some 3,840 customers. “A troubleshooter is responding,” the power agency tweeted. Power was soon restored to 1,614 customers, while 2,226 remain without power.

As the agency’s troubleshooter continued to investigate, it was learned that the cause of the outage was squirrels that had chewed through an electric cable.

“We are awaiting an update from the field on estimated restoration,” the agency said.

As of around 1:20 p.m., 143 customers were still without power while ongoing repairs were made. “Due to the amount of damage, the estimate is midnight,” Silicon Valley Power, which is the City of Santa Clara’s municipal electric utility, tweeted.