Oops:
"The outage was triggered after a 500-kilovolt (kV) high-voltage line from Arizona to California tripped out of service. The transmission outage cut the flow of imported power into the most southern portion of California, resulting in wide-spread outages in the region," according to Cal ISO. ...
The Arizona power company APS said the outage appears to be related to a procedure an employee was carrying out in the North Gila substation, located northeast of Yuma, Ariz. Operator error was determined to be the initiating event.
Operating and protection protocols typically would have isolated the resulting outage to the Yuma area. The reason that did not occur in this case will be the focal point of the investigation, which is underway.
More here.
Who needs terrorists when home grown incompetence will do?
