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REGULATORY ACTIONS (Tables)
3 Months Ended
Mar. 31, 2013
REGULATORY ACTIONS [Abstract]  
Summary of Deferred Energy Amounts
   March 31, 2013 
   NVE Total NPC Electric SPPC Electric SPPC Gas 
 Deferred Energy            
  Cumulative Balance as of December 31, 2012$(151,880) $(101,117) $(32,693) $(18,070) 
  2013 Amortization 55,053  30,313  11,296  13,444 
  2013 Deferred Energy Under Collections (1) 25,498  16,896  7,795  807 
 Deferred Energy Balance at March 31, 2013 - Subtotal $(71,329) $(53,908) $(13,602) $(3,819) 
 Reinstatement of deferred energy (effective 6/07, 10 years) 99,113  99,113   -   - 
  Total Deferred Energy$27,784 $45,205 $(13,602) $(3,819) 
               
 Deferred Assets            
  Deferred energy$84,120 $84,120 $ - $ - 
 Current Liabilities            
  Deferred energy (56,336)  (38,915)  (13,602)  (3,819) 
  Total Net Deferred Energy$27,784 $45,205 $(13,602) $(3,819) 
               
 (1)These deferred energy under collections are subject to quarterly rate resets as discussed in Note 1, Summary of Significant Accounting
  Policies, Deferred Energy Accounting, of the Notes to Financial Statements in the 2012 Form 10-K.
               
Summary of Rate Filings
              
    Anticipated Requested Present $ Change in 
    Effective Revenue Revenue Revenue 
    Date Requirement Requirement Requirement 
 Revenue Requirement Subject To Change:           
              
  REPR(1)Oct. 2013 $28.4 $38.7 $(10.3) 
  TRED(1)Oct. 2013  15.7  15.9  (0.2) 
  EEPR Base(1)Oct. 2013  45.9  32.6  13.3 
  EEPR Amortization(1)Oct. 2013  (29.9)  9.0  (38.9) 
  EEIR BaseOct. 2013  15.1  10.6  4.5 
  EEIR AmortizationOct. 2013  (6.7)  10.7  (17.4) 
   Total Revenue Requirement  $68.5 $117.5 $(49.0) 
               
 (1)Represents programs that require the Utilities to collect funds from customers for which the related costs are equal to the 
  revenues collected. As a result, such programs have no effect on Operating or Net Income. 

              
    Anticipated Requested Present $ Change in 
    Effective Revenue Revenue Revenue 
    Date Requirement Requirement Requirement 
 Revenue Requirement Subject To Change:           
  REPR (1)Oct. 2013 $42.3 $44.4 $(2.1) 
  TRED (1)Oct. 2013  7.4  6.3  1.1 
  EEPR Base (1)Oct. 2013  6.0  5.6  0.4 
  EEPR Amortization (1)Oct. 2013  (2.2)  1.8  (4.0) 
  EEIR BaseOct. 2013  5.6   4.7  0.9 
  EEIR AmortizationOct. 2013  1.1   1.9  (0.8) 
   Total Revenue Requirement  $60.2 $64.7 $(4.5) 
               
  (1)Represents programs that require the Utilities to collect funds from customers for which the related costs are equal to the 
  revenues collected. As a result, such programs have no effect on Operating or Net Income.