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DERIVATIVES AND HEDGING ACTIVITIES (Tables)
12 Months Ended
Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value, Measurement Inputs, Disclosure [Table Text Block]
 December 31, 2011 December 31, 2010
Derivative ContractsLevel 2 Level 2
 NVE NPC SPPC NVE NPC SPPC
                  
Risk management assets - current$ - $ - $ - $2.1 $2.1 $0.0
Risk management assets - noncurrent  -   -   -   -   -  0.0
Total risk management assets  -   -   -  2.1  2.1  0.0
                  
Risk management liabilities- current 2.4  2.4   -  32.9  22.4  10.5
Risk management liabilities- noncurrent  1.1   -   -   -   -  0.0
Total risk management liabilities 3.5  2.4   -  32.9  22.4  10.5
                  
Risk management regulatory assets – net(1)$(3.5) $(2.4) $ - $(30.8) $(20.3) $(10.5)