Flacco threw three touchdown passes in the first half as the Ravens jumped to a 21-6 lead at halftime. After Jones returned the second-half kickoff 108 yards for a touchdown to give the Ravens a 22-point lead, the lights went out in the dome. The 49ers scored 17 straight points after a 34-minute power outage to close the Ravens' advantage to 28-23 at the end of the third quarter. San Francisco cut the deficit to two points on quarterback Colin Kaepernick's touchdown run but failed on the 2-point conversion attempt. KEY NUMBER: 2 -- Touchdowns for Jones: his second 108-yard kickoff return this season and a 56-yard catch in the second quarter. RAVEN OF THE GAME: Flacco. The Super Bowl Most Valuable Player completed 22 of 33 passes for 287 yards.