The Baltimore Ravens were leading the San Francisco 49ers 28-6 when most of the lights in the 73,000-seat building went out with 13:22 left in the third quarter.
Auxiliary power kept the playing field from going totally dark, but escalators stopped working and the concourses were only illuminated by small banks of lights tied in to emergency service.
Philip Allison, a spokesman for Entergy New Orleans, which provides power to the stadium, said power had been flowing into the stadium before the lights failed.
“All of our distribution and transmission feeds going into the Superdome were operating as expected,” Allison said.
The outage appeared to originate in a failure of equipment maintained by stadium staff, he added.
The power failure occurred shortly after Jacoby Jones returned the opening kickoff of the second half for a touchdown, giving the Ravens a commanding lead.
The public address announcer said the Superdome was experiencing an interruption of electrical service and encouraged fans to stay in their seats. Players milled around on the sidelines during the delay.
Officials gathered on the field and appeared to be talking to stadium personnel. Finally, the lights came back on throughout the stadium and the game resumed.
“We haven’t had the Super Bowl in 11 years,” said Monique Richard, a fan from near Lake Pontchartrain. “It might be 20 more. Hopefully, everybody will be understanding.”