An Eversource power surge sparked fires and outages across Waltham on Monday, causing issues on the road with traffic signals being impacted.

It was the second power surge in the city within a year, following October’s similar incident when there were dozens of emergency calls.

On Monday, the city reported that Eversource had experienced a power surge that was affecting various areas of Waltham. Officials told residents to use caution while traveling throughout the city.

“This morning, Waltham Firefighters responded to reports of multiple fires in Waltham due to a power surge,” the city wrote in an alert. “Street lights and Traffic signals have been effected and may be out for some time.

“If you have experienced a power outage, it is recommended that you do not reuse power strips/surge protectors,” the city added. “It will take an undetermined amount of time to restore proper function of those utilities.”

Eversource reported that the utility company responded to a power outage in Waltham just before 8:30 a.m., impacting about 3,000 customers.

“Our team worked as quickly as safely possible and restored power to all our affected customers within one hour,” Eversource tweeted. “We’re actively working to determine an exact cause for the outage.”