You have it backward. The Ravens were the ones up before the power outage.
"Baltimore built a 28–6 lead early in the third quarter before a partial power outage in the Superdome suspended play for 34 minutes (earning the game the added nickname of the Blackout Bowl).[14][15] After play resumed, San Francisco scored 17 unanswered third-quarter points to cut the Ravens' lead to 28–23, and continued to chip away in the fourth quarter"
https://en.wikipedia.org/wiki/Super_Bowl_XLVII