Backup Power: A Growing Need, if You Can Afford It

When frigid weather caused rolling blackouts on Christmas Eve across North Carolina, Eliana and David Mundula quickly grew worried about their 2½-week-old daughter, whom they had brought home days earlier from a neonatal intensive care unit. “The temperature was dropping in the house,” said Ms. Mundula, who lives in Matthews, south of Charlotte. “I became …

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