The wire above the 21-Hayes bus snagged and hit a Pacific Gas and Electric Co. wire Thursday morning, knocking out power to about 3,000 customers in the Panhandle.
The incident happened around 8:45 a.m. and caused traffic jams while PG&E officials were fixing the wire.
Fire officials responded because residents nearby said there was a smell of smoke. However, nothing caught fire and no injuries were reported, according to fire officials.
The bus line was interrupted for about an hour, so Muni provided bus bridges and traffic was diverted around the intersection.
When the PG&E wire hit another wire, it automatically shut off power running through that wire, PG&E spokesman Joe Molica said.