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NStar: Power restoration in Boston complete

BOSTON (AP) — Power has been restored to the last of the customers who lost electricity after a smoky electrical transformer fire in Boston’s Back Bay earlier this week., NStar says.

An NStar spokesman says the last 1,500 powerless customers were back online at about 2 a.m. Friday. About 21,000 customers lost power after the fire Tuesday evening.

NStar chief executive Tom May said at a news conference the fire was caused by an unusual ‘‘catastrophic’’ connector failure between a substation housing the transformer and the transmission system. He said cables and generators are a temporary solution, and it’s hoped an undamaged second transformer at the substation can be reconnected.

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State utility regulators said they’ll require a full report from NStar. Boston Mayor Thomas Menino said NStar shareholders should bear the outage costs.