When the lights went out across large swaths of Cambridge just as Thursday’s workday ended, it was the latest in a string of outages caused by NStar equipment failures this year, renewing questions about the Boston utility’s ability to keep the power on. NStar said its data show that its average time to restore outages, including during major storms, remained below that of other utilities in the Northeast by up to several hours, from 2009 to 2011.
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