Entergy role in Super Bowl blackout dims stock

• Entergy New Orleans%2C Entergy subsidiary%2C takes blame for power outage
• Superdome was without power for 34 minutes just after game%27s halftime
• The company said it traced outage to faulty relay in switching gear

Last Sunday's Super Bowl blackout dimmed the stock of the Superdome's electricity supplier Friday after Entergy New Orleans took the blame for the power failure..

Shares off Entergy (ETR), parent of Entergy New Orleans, closed Friday down 0.8% to $64.47 apiece after the announcement of its role in the 34-minute delay. Play was halted just after halftime in Sunday's NFL football game won by the Baltimore Ravens against the San Francisco 49ers.

Many TV viewers and game attendees had speculated that a dazzling display of fireworks during Beyoncé's halftime performance, might have played a role in the blackout. That turned out to be wrong.

During Friday's trading session, the stock price of New Orleans-based Entergy dropped more than 2%, but recovered more than half of that price decline before the closing bell.

Entergy said the power outage was traced to a faulty relay in switching gear designed to prevent a power failure in electric cables leading to the stadium. "During Sunday's game, the relay device triggered, signaling a switch to open when it should not have," the company said.

Company officials said the device performed without problem during January's Sugar Bowl and other earlier events. They said the device has been removed and replacement equipment will be installed.

Entergy officials disclosed information about the switching gear's failure as they prepared to answer questions about the outage from a committee of New Orleans' City Council members Friday. The council regulates the company.

Contributing: The Associated Press