NEW ORLEANS -- Superdome officials warned just months before the Super Bowl that the venue's electrical system could suffer a power outage and rushed to replace some of the equipment ahead of the big game.
While the cause of Sunday's 34-minute outage is still under investigation, records released Monday show that Superdome officials were worried in October about losing power during the NFL championship.
Tests on the electrical feeders that connect incoming power from utility lines to the stadium showed decay and "a chance of failure," state officials warned in a memo dated Oct. 15. The documents, obtained through a records request by The Associated Press, also show the utility that supplies the stadium expressed concern about the reliability of the service before the Super Bowl.
The memo said utility Entergy New Orleans and the Superdome's engineering staff "had concerns regarding the reliability of the Dome service from Entergy's connection point to the Dome."
The memo was prepared for the Louisiana Stadium & Exposition District, the state body responsible for the Superdome.
Authorities then authorized spending nearly $1 million on Superdome improvements, including more than $600,000 for upgrading the dome's electrical feeder cable system, work that was done in December.
"As discussed in previous board meetings, this enhancement is necessary to maintain both the Superdome and the New Orleans Arena as top tier facilities, and to ensure that we do not experience any electrical issues during the Super Bowl," said an LSED document dated Dec. 19.
A lawyer for the LSED, Larry Roedel, said Monday a preliminary investigation found the replacement work done in December did not appear to have caused Sunday's outage.
Entergy and the company that manages the Superdome, SMG, said Sunday that an "abnormality" occurred where stadium equipment intersects with an Entergy electric feed, causing a breaker to create the outage. It remained unclear Monday exactly what the abnormality was or why it occurred.
The lights-out championship game proved an embarrassment for New Orleans just when it was hoping to show the rest of the world how far it has come since Hurricane Katrina in 2005. But many fans were forgiving, and officials expressed confidence that the episode wouldn't hurt the city's hopes of hosting the championship again.
To New Orleans' relief, NFL Commissioner Roger Goodell said the city did a "terrific" job hosting its first pro football championship in the post-Katrina era.
"I fully expect that we will be back here for Super Bowls," he said, noting a backup power system was poised to kick in but wasn't needed once the lights came back.