SAN FRANCISCO - "Monday Night Football" nearly literally lived up to its name.

The San Francisco 49ers (11-3) pounded the Pittsburgh Steelers (10-4), 20-3, in a game delayed 20 minutes at the start by a power outage at Candlestick Park. The game was delayed again with 12 minutes, 13 seconds remaining before halftime by a second blackout that lasted 14 minutes.

The power throughout the stadium went off about 25 minutes before the scheduled kickoff of 5:40 local time. The public-address system stopped working and fans were left in the dark until an emergency light came on in the far corner of the stadium.

A 49ers spokesman said transformers appeared to fail outside the stadium. Joe Molica, a spokesman for Pacific Gas & Electric Co., said the power company was still investigating the cause of the outage.

The 49ers capitalized on four Pittsburgh turnovers to tie New Orleans for the second-best record in the NFC.

Pittsburgh remained in a first-place tie with Baltimore in the AFC North.