Raging California wildfires trigger transmission emergency

The warning is the third in as many days for Southern California, which has been declared a major disaster zone by President Bush. Wildfires and smoke have caused transmission lines in many locations in the region to trip out of service for various lengths of time.

The situation remained volatile today with shifting winds sending some fires back in the direction of high-voltage power lines. CAISO urged "voluntary energy conservation" in an effort to reduce the strain on the transmission netw