Back Bay Blackout

The fire was caused by a transformer explosion in a garage on Dalton Street in the Back Bay. (credit: Boston Fire Dept.)

The fire was caused by a transformer explosion in a garage on Dalton Street in the Back Bay. (credit: Boston Fire Dept.)

The blackout was caused by a transformer explosion in a garage on Dalton Street in the Back Bay. (Photo courtesy: Boston Fire)

The blackout was caused by a transformer explosion in a garage on Dalton Street in the Back Bay. This is the view from Skyeye4 Tuesday evening.

The fire was caused by a transformer explosion in a garage on Dalton Street in the Back Bay. (credit: Boston Fire Dept.)

The fire was caused by a transformer explosion in a garage on Dalton Street in the Back Bay. (credit: Boston Fire Dept.)

Boston firefighters used a saw to cut through a garage door after the transformer explosion. (Photo by Bernice Corpuz)

The fire was caused by a transformer explosion in a garage on Dalton Street in the Back Bay. (credit: Boston Fire Dept.)

Boston firefighters after successfully putting out the the fire on Dalton Street. (credit: Boston Fire Dept.)

Firefighters get their gear hosed down after fighting the transformer fire in the Back Bay. (credit: Boston Fire Dept.)

The lights were still out in the Prudential Center at sunrise Wednesday.

6 portable generators on flatbeds from New York arrived at NStar's site Wednesday morning (Photo by Chris Gobeille)

This intersection on Huntington Ave. was one of about 100 without traffic lights Wednesday.