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Palo Verde (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Public Utilities, Property, Plant and Equipment [Abstract]  
Reduction In Depreciation Expense$ 5.3 
Reduction In Accretion Expense2.0 
Estimated decommissioning costs $ 357.4
Magnitude earthquake (in MMS) 9.0