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NStar faulted for second Back Bay blackout

State regulators called this week’s power outage in the Back Bay unacceptable and demanded Friday that electric company NStar provide a full account of what is being done to prevent repeat blackouts.

The regulators, from the Department of Public Utilities, told NStar officials they must maintain the “highest standards’’ as they repair an electrical substation that caught fire in March, cutting power for two days to a broad swath of the city.

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