An underground fire in the Uphams Corner section of Dorchester knocked out power for about 30 utility customers Thursday afternoon, officials said.
Boston fire spokesman Marc Sanders said crews responded to a fire in a manhole in the neighborhood around 3:30 p.m.
Priscilla Ress, a spokeswoman for Eversource, said utility equipment and infrastructure failed Thursday because of the heat, which caused about 30 customers to lose power around Columbia Road. As of 8:50 p.m., those customers were still without power.
Boston has been in the grips of a heatwave for several days, and temperatures in the city rose to the 90s on Thursday. The outage in Dorchester came on the heels of about 1,600 customers losing power earlier Thursday in Brighton, Brookline, and West Roxbury from an underground cable failure caused by the stifling temperatures.
Ress, speaking shortly before 9 p.m., said Eversource hoped all power would be restored by midnight.
“We’re working as quickly and safely as possible to get the power back on,” she said.
Another reported manhole fire caused police to shut down a stretch of Boylston Street to traffic Thursday night, according to police.
David Estrada, a Boston police spokesman, said officers responded to the 700 block of Boylston, near the intersection with Exeter Street, around 8:22 p.m. There were no injuries in connection with that fire, he said.
As of 10:10 p.m., Ress said there were no power outages in connection with the manhole fire on Boylston.