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REGULATORY ACTIONS (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Integer
MW
Dec. 31, 2010
Nevada Deferred Energy      
Cumulative Balance authorized in 2011 DEAA $ (331,013,000) $ (331,013,000)  
2011 Amortization 104,330,000 104,330,000  
2011 Deferred Energy Over Collections (100,833,000) [1] (100,833,000) [1]  
Nevada Deferred Energy Balance at period end - Subtotal (327,516,000) (327,516,000)  
Reinstatement of deferred energy (effective 6/07, 10 years) 125,999,000 125,999,000  
Total (201,517,000) (201,517,000)  
Deferred Assets      
Deferred energy 111,135,000 111,135,000 117,623,000
Current Liabilities      
Deferred energy (312,652,000) (312,652,000) (315,839,000)
Total (201,517,000) (201,517,000)  
Ely Energy Center [Abstract]      
Spending amount approved by PUCN on EEC 130,000,000 130,000,000  
Amount spent on EEC and recorded as other deferred asset 65,500,000 65,500,000  
NPC Electric [Member]
      
Nevada Deferred Energy      
Cumulative Balance authorized in 2011 DEAA (186,460,000) [2] (186,460,000) [2]  
2011 Amortization 45,355,000 45,355,000  
2011 Deferred Energy Over Collections (56,708,000) [1] (56,708,000) [1]  
Nevada Deferred Energy Balance at period end - Subtotal (197,813,000) (197,813,000)  
Reinstatement of deferred energy (effective 6/07, 10 years) 125,999,000 125,999,000  
Total (71,814,000) (71,814,000)  
Current Liabilities      
Total (71,814,000) (71,814,000)  
SPPC Electric [Member]
      
Nevada Deferred Energy      
Cumulative Balance authorized in 2011 DEAA (115,602,000) (115,602,000)  
2011 Amortization 48,320,000 48,320,000  
2011 Deferred Energy Over Collections (28,075,000) [1] (28,075,000) [1]  
Nevada Deferred Energy Balance at period end - Subtotal (95,357,000) (95,357,000)  
Total (95,357,000) (95,357,000)  
Current Liabilities      
Total (95,357,000) (95,357,000)  
SPPC [Member] | SPPC Gas [Member] | DEAA [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Jan. 2012  
Requested Revenue Requirement (29,000,000) (29,000,000)  
Present Revenue Requirement (16,700,000) (16,700,000)  
Change in Revenue Requirement (12,300,000) (12,300,000)  
SPPC [Member] | SPPC Gas [Member] | STPR [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 300,000 300,000  
Present Revenue Requirement 0 0  
Change in Revenue Requirement 300,000 300,000  
SPPC Gas [Member]
      
Nevada Deferred Energy      
Cumulative Balance authorized in 2011 DEAA (28,951,000) (28,951,000)  
2011 Amortization 10,655,000 10,655,000  
2011 Deferred Energy Over Collections (16,050,000) [1] (16,050,000) [1]  
Nevada Deferred Energy Balance at period end - Subtotal (34,346,000) (34,346,000)  
Total (34,346,000) (34,346,000)  
Current Liabilities      
Total (34,346,000) (34,346,000)  
SPPC Gas [Member]
      
Revenue Requirement Subject To Change:      
Requested Revenue Requirement (28,700,000) (28,700,000)  
Present Revenue Requirement (16,700,000) (16,700,000)  
Change in Revenue Requirement (12,000,000) (12,000,000)  
NPC [Member]
      
Deferred Assets      
Deferred energy 111,135,000 111,135,000 117,623,000
Current Liabilities      
Deferred energy (182,949,000) (182,949,000) (171,349,000)
Energy Efficiency Implementation Rate [Abstract]      
Approximate revenues filed for estimated reduced kWh sales from energy efficiency programs   35,100,000  
Increases to EEIR base rates authorized 14,400,000 14,400,000  
Pre-tax adjustment to earnings for revenue previously recorded 4,500,000    
Revenues recognized of the authorized base amounts 7,400,000 7,400,000  
Energy Efficiency Program Rate [Abstract]      
Approximate costs filed for implementing energy efficiency programs   71,000,000  
Increases to EEPR base rates authorized 58,000,000 58,000,000  
NPC 2011 GRC [Abstract]      
Requested increase in general rates 245,500,000 245,500,000  
Requested return on equity (in hundredths) 11.25% 11.25%  
Requested rate of return (in hundredths) 8.66% 8.66%  
Requested recovery, excluding AFUDC, for the expansion at the Harry Allen Generating Station 638,700,000 638,700,000  
Requested authorization to defer collection 64,000,000 64,000,000  
Remaining requested increase, approximately equal to revenue requirement decreases 181,500,000 181,500,000  
Revenue Requirement Subject To Change:      
Requested Revenue Requirement (55,600,000) (55,600,000)  
Present Revenue Requirement 17,600,000 17,600,000  
Change in Revenue Requirement (73,200,000) (73,200,000)  
Amount of amortization recognized in revenues     4,800,000
Amount expected to be collected from customers 4,800,000 4,800,000  
NPC Harry Allen Regulatory Asset Filing [Abstract]      
Planned expansion at generating station, capacity increase (in MW)   500  
Expenses not to be recovered due to regulatory lag   40,000,000  
NPC [Member] | DEAA [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Jan. 2012  
Requested Revenue Requirement (186,500,000) (186,500,000)  
Present Revenue Requirement (101,000,000) (101,000,000)  
Change in Revenue Requirement (85,500,000) (85,500,000)  
NPC [Member] | REPR [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 9,000,000 9,000,000  
Present Revenue Requirement 29,900,000 29,900,000  
Change in Revenue Requirement (20,900,000) (20,900,000)  
NPC [Member] | TRED [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 14,600,000 14,600,000  
Present Revenue Requirement 16,300,000 16,300,000  
Change in Revenue Requirement (1,700,000) (1,700,000)  
NPC [Member] | EEPR Base [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 58,000,000 [3] 58,000,000 [3]  
Present Revenue Requirement 58,000,000 [3] 58,000,000 [3]  
Change in Revenue Requirement 0 0  
NPC [Member] | EEPR Amortization [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 22,800,000 22,800,000  
Present Revenue Requirement 0 0  
Change in Revenue Requirement 22,800,000 22,800,000  
NPC [Member] | EEIR Base [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 14,400,000 [3] 14,400,000 [3]  
Present Revenue Requirement 14,400,000 [3] 14,400,000 [3]  
Change in Revenue Requirement 0 0  
NPC [Member] | EEIR Amortization [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 12,100,000 [4] 12,100,000 [4]  
Present Revenue Requirement 0 0  
Change in Revenue Requirement 12,100,000 12,100,000  
SPPC [Member]
      
Current Liabilities      
Deferred energy (129,703,000) (129,703,000) (144,490,000)
Energy Efficiency Implementation Rate [Abstract]      
Approximate revenues filed for estimated reduced kWh sales from energy efficiency programs   7,600,000  
Increases to EEIR base rates authorized 2,600,000 2,600,000  
Pre-tax adjustment to earnings for revenue previously recorded 4,100,000    
Revenues recognized of the authorized base amounts 1,000,000 1,000,000  
Energy Efficiency Program Rate [Abstract]      
Approximate costs filed for implementing energy efficiency programs   12,100,000  
Increases to EEPR base rates authorized 9,800,000 9,800,000  
Revenue Requirement Subject To Change:      
Requested Revenue Requirement (47,000,000) (47,000,000)  
Present Revenue Requirement (42,600,000) (42,600,000)  
Change in Revenue Requirement (4,400,000) (4,400,000)  
Amount of amortization recognized in revenues     500,000
Amount expected to be collected from customers 500,000 500,000  
SPPC [Member] | DEAA [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Jan. 2012  
Requested Revenue Requirement (115,600,000) (115,600,000)  
Present Revenue Requirement (99,500,000) (99,500,000)  
Change in Revenue Requirement (16,100,000) (16,100,000)  
SPPC [Member] | REPR [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 38,100,000 38,100,000  
Present Revenue Requirement 36,600,000 36,600,000  
Change in Revenue Requirement 1,500,000 1,500,000  
SPPC [Member] | TRED [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 5,900,000 5,900,000  
Present Revenue Requirement 7,900,000 7,900,000  
Change in Revenue Requirement (2,000,000) (2,000,000)  
SPPC [Member] | EEPR Base [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 9,800,000 [5] 9,800,000 [5]  
Present Revenue Requirement 9,800,000 [5] 9,800,000 [5]  
Change in Revenue Requirement 0 0  
SPPC [Member] | EEPR Amortization [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 4,700,000 4,700,000  
Present Revenue Requirement 0 0  
Change in Revenue Requirement 4,700,000 4,700,000  
SPPC [Member] | EEIR Base [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 2,600,000 [5] 2,600,000 [5]  
Present Revenue Requirement 2,600,000 [5] 2,600,000 [5]  
Change in Revenue Requirement 0 0  
SPPC [Member] | EEIR Amortization [Member]
      
Revenue Requirement Subject To Change:      
Anticipated Effective Date   Oct. 2011  
Requested Revenue Requirement 7,500,000 [6] 7,500,000 [6]  
Present Revenue Requirement 0 0  
Change in Revenue Requirement $ 7,500,000 $ 7,500,000  
[1] These deferred energy over collections will be filed in the March 2012 DEAA filings.
[2] Refer to NPC 2010 DEAA Settled Regulatory Actions in Note 3, Regulatory Actions, of the Notes to Financial Statements in the 2010 Form 10-K for separate discussion regarding rate offset of this balance.
[3] Reflects impact of adjustments ordered in the May 2011 PUCN Docket No. 10-10024, filed in October 2010 and effective July 1, 2011.
[4] Amount represents proposed EEIR amortization rates as originally filed. In accordance with Alternative Revenue Accounting, NPC has recognized approximately $4.8 million of this amount in revenues pertaining to 2010. Based on the order from the PUCN in May 2011, which clarified the calculation of EEIR revenues, NPC does not expect to record further revenue from this rate request; however, NPC does expect to collect approximately $4.8 million from its customers.
[5] Reflects impact of adjustments ordered in the May 2011 PUCN Docket No. 10-10025, filed in October 2010 and effective July 1, 2011.
[6] Amount represents proposed EEIR amortization rates as originally filed. In accordance with Alternative Revenue Accounting, SPPC has recognized approximately $0.5 million of this amount in revenues pertaining to 2010. Based on the order from the PUCN in May 2011, which clarified the calculation of EEIR revenues, SPPC does not expect to record further revenue from this rate request; however, SPPC does expect to collect approximately $0.5 million from their customers.