The 2,150 MWe San Onofre nuclear power plant in California reconnected the second of two generating units September 12, four days after a blackout shut down the plant, according to news reports.
Plant owner Southern California Edison reportedly brought the 1,070 MWe Unit 2 back online September 11 and the 1,080 MWe Unit 3 the following day.
The September 8 blackout knocked out power in Southern California, parts of Arizona and northern Baja Mexico. An Arizona Public Service worker is believed to have carried out a procedure at a substation that shut down transmission lines leading to the plant. San Onofre shut down as it was designed to do.
The Federal Energy Regulatory Commission (FERC) and the North American Electric Reliability Corp. (NERC) have opened a probe into the cause of the blackout.
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