(Adds details on power outage)
HOUSTON, Dec 19 (Reuters) - Shell lost power on Monday atits 156,400 barrel per day Martinez refinery near San Francisco,according to a filing with the California Governor's Office ofEmergency Services.
Flaring was ongoing following the outage, which occurred at1:43 p.m. PST (2143 GMT) and resulted in visible black smoke atthe refinery, the filing said.
There were no injuries or evacuations as a result of theoutage and its cause was under investigation, the notice said.
A company representative did not immediately respond to arequest for comment. (Reporting by Liz Hampton and Erwin Seba in Houston; Editing byDan Grebler)