ATTN: Power outage in the Richmond District is causing rolling delays, @PG&E crews are working to restore service.
— SFMTA (@sfmta_muni) July 30, 2017
The outage was reported before 9:30 a.m. near California and 17th.

The San Francisco Fire Department was called to the scene and closed all but one lane in both directions near the intersection. The scene has since been cleared and all lanes are back open.
ATTN: Both directions of 1 Line blocked by @SFFD activity at California/16th, switching back OB-IB at 6th, shuttles supporting service.
— SFMTA (@sfmta_muni) July 30, 2017
As of 8 p.m. less than 150 PG&E customers were without power after more than 3,000 had power restored.

An equipment failure was blamed for the outage.