June 21, 2013:

Tesoro Corp. (TSO) reported a power failure earlier this week at its Martinez, Calif., refinery, according to a filing with Contra Costa County health officials made public Friday.  The cause of the outage at the 166,000 barrel-a-day refinery was unknown at the time the company reported it on Wednesday, and there was "no estimate of time available for restart," according to the filing. No flaring was reported.

A spokesman for Tesoro was not immediately available for comment.

By The Wall Street Journal