Raging California wildfires trigger transmission emergency

The California Independent System Operator Corporation (CAISO), which operates California’s open-market wholesale power grid, has issued a transmission emergency warning following four days of wildfires that have sparked the biggest US evacuation since Hurricane Katrina.

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 network

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