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Thousands still without power

An NStar crewworked on Dartmouth Street to help restore power in the Back Bay.

JONATHAN WIGGS/GLOBE STAFF

An NStar crew worked on Dartmouth Street to help restore power in the Back Bay on Wednesday.

BOSTON (AP) — About 4,000 customers remain without power a day and a half after a smoky electrical transformer fire in Boston’s Back Bay area knocked out electricity to about 21,000.

NStar crews worked through the night into Thursday morning.

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NStar said the goal is to get everyone back online by about noon Thursday.

The utility installed temporary cables and dozens of generators to bring back power until permanent repairs can be made, but the extensive work was taking longer than first expected.

There were still traffic restrictions, but no problems were reported. The Massachusetts Turnpike’s Exit 22 ramps to Copley Square and Prudential Center were closed to allow for the electrical work.

All subway stations in the area reopened Wednesday afternoon.

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