Superdome spokesman Eric Eagan is apologizing for the power outage that disrupted the Super Bowl.
He says technical staff were working more than an hour after the outage to determine what caused it, but still didn't know.
''We sincerely apologize for the incident,'' Eagan said.
The outage was a big glitch for New Orleans in its first Super Bowl since the city has rebuilt from Hurricane Katrina in 2005.
The 38-year-old Superdome has undergone $336 million in renovations since Katrina ripped its roof in 2005. Billions have been spent sprucing up downtown, the airport, French Quarter and other areas of the city in the past seven years.
Mayor Mitch Landrieu called the power outage unfortunate in an otherwise smooth week.
''In the coming days, I expect a full after action report from all parties involved. For us, the Super Bowl isn't over until the last visitor leaves town, so we're focused on continuing to show our visitors a good time,'' Landrieu said.
New Orleans is trying to get back to being a regular stop in the Super Bowl rotation, and has announced it will bid on the 2018 game.
That would coincide with the 300th anniversary of the city's founding.