As of 10 p.m., parts of Roslindale, Hyde Park, Roxbury and Dorchester were without power.
Parts of the western side of South Boston went dark when a manhole on West 1 St. between B and C went kablooie. NStar was unable to provide an estimate for when workers could get down there for a look.
Firefighters responded to 320 W. 2 St., where the power outage stranded a man and his dog in an elevator between the fourth and fifth floors. Tom McGuire reports they were rescued.
In Roslindale, Ed Grzyb reported, the outage area included Hyde Park Avenue by Blakemore, Rowe, and streets east of Cummins down near Healy.
In Dorchester, power was out along Dorchester Avenue from Gallivan to Washington Street in Lower Mills.
In all, NStar was reporting 4,600 customers without power - which likely means far more residents.
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