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 angry.”But her husband pulled out a small gasoline generator a neighbor had convinced them to buy a couple of years earlier, allowing them to use a portable heater and restart their refrigerator, keeping them going for much of the five-hour outage.North of Charlotte, in the town of Cornelius, Gladys Henderson, an 80-year-old former cafeteria worker, was less fortunate. She did not have a …
