Found a little more from another news article from the local news papers online service.
Entergy and SMG, the management company of the Mercedes-Benz Superdome, issued a statement late Sunday explaining the power loss:
"Shortly after the beginning of the second half of the Super Bowl in the Mercedes-Benz Superdome, a piece of equipment that is designed to monitor electrical load sensed an abnormality in the system. Once the issue was detected, the sensing equipment operated as designed and opened a breaker, causing power to be partially cut to the Superdome in order to isolate the issue.
"Backup generators kicked in immediately as designed. Entergy and SMG subsequently coordinated start up procedures, ensuring that full power was safely restored to the Superdome.
"The fault-sensing equipment activated where the Superdome equipment intersects with Entergy’s feed into the facility.
Blame the Energy Code. I predicted this exact thing when the energy codes first came out a few years ago.
Commercial place: everything on occupancy detectors or timers. Timers limited to 2 hours in 'manual' mode, then return to program.
I bet someone hit the 'bypass' mode tolight up the stadium - you can be sure the SuperBowl is not a 'programmed' event. Two hours later and "CLUNK" as the timer kills the lights. Now we get to wait 20 minuted for the lights to re-strike.
I predicted it would happen during an NBA playoff. Close enough.