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CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Current Assets:  
Cash and cash equivalents$ 137,475$ 86,189
Accounts receivable less allowance for uncollectible accounts:487,384354,010
Materials, supplies and fuel, at average cost141,107114,520
Risk management assets (Note 6)644,007
Current income taxes receivable8282
Deferred income taxes114,414130,800
Other current assets47,57242,330
Total Current Assets928,098731,938
Utility Property:  
Plant in service11,944,74011,068,518
Construction work-in-progress413,299908,579
Total12,358,03911,977,097
Less accumulated provision for depreciation3,167,9253,047,438
Total Utility Property, Net9,190,1148,929,659
Investments and other property, net54,96861,613
Deferred Charges and Other Assets:  
Deferred energy (Note 3)105,778117,623
Regulatory assets1,083,8981,237,159
Regulatory asset for pension plans255,037269,472
Other deferred charges and assets148,872166,882
Total Deferred Charges and Other Assets1,593,5851,791,136
Assets Held for Sale (Note 10)0155,322
TOTAL ASSETS11,766,76511,669,668
Current Liabilities:  
Current maturities of long-term debt (Note 4)136,139355,929
Accounts payable341,500346,409
Accrued expenses106,260133,851
Risk management liabilities (Note 6)1,51533,229
Deferred energy (Note 3)283,046315,839
Other current liabilities60,35770,638
Total Current Liabilities928,8171,255,895
Long-term debt (Note 4)5,038,2324,924,109
Commitments and Contingencies (Note 8)  
Deferred Credits and Other Liabilities:  
Deferred income taxes1,317,1761,246,410
Deferred investment tax credit16,79619,204
Accrued retirement benefits149,008148,841
Risk management liabilities (Note 6)4160
Regulatory liabilities476,305428,114
Other deferred credits and liabilities374,326265,571
Total Deferred Credits and Other Liabilities2,334,0272,108,140
Liabilities Held for Sale (Note 10)030,706
Shareholders' Equity:  
Common stock236,000235,323
Other paid-in capital2,713,9582,705,954
Retained earnings520,205416,432
Accumulated other comprehensive loss(4,474)(6,891)
Total Shareholders' Equity3,465,6893,350,818
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY11,766,76511,669,668
Nevada Power Company [Member]
  
Current Assets:  
Cash and cash equivalents34,75360,077
Accounts receivable less allowance for uncollectible accounts:370,567224,704
Materials, supplies and fuel, at average cost75,85666,459
Risk management assets (Note 6)643,476
Deferred income taxes73,08476,282
Other current assets32,98729,680
Total Current Assets587,311460,678
Utility Property:  
Plant in service8,394,6457,552,097
Construction work-in-progress286,694825,079
Total8,681,3398,377,176
Less accumulated provision for depreciation1,902,9921,828,366
Total Utility Property, Net6,778,3476,548,810
Investments and other property, net49,09455,305
Deferred Charges and Other Assets:  
Deferred energy (Note 3)105,778117,623
Regulatory assets769,136871,982
Regulatory asset for pension plans125,453133,410
Other deferred charges and assets108,756114,016
Total Deferred Charges and Other Assets1,109,1231,237,031
TOTAL ASSETS8,523,8758,301,824
Current Liabilities:  
Current maturities of long-term debt (Note 4)136,139355,929
Accounts payable220,601232,279
Accounts payable, affiliated companies29,05629,334
Accrued expenses65,45989,638
Risk management liabilities (Note 6)1,25822,764
Deferred energy (Note 3)174,155171,349
Other current liabilities46,26354,607
Total Current Liabilities672,931955,900
Long-term debt (Note 4)3,352,0443,221,833
Commitments and Contingencies (Note 8)  
Deferred Credits and Other Liabilities:  
Deferred income taxes982,194908,094
Deferred investment tax credit6,4257,255
Accrued retirement benefits35,87831,907
Risk management liabilities (Note 6)4160
Regulatory liabilities267,417225,983
Other deferred credits and liabilities293,259189,220
Total Deferred Credits and Other Liabilities1,585,5891,362,459
Shareholders' Equity:  
Common stock11
Other paid-in capital2,308,2192,254,219
Retained earnings607,939511,288
Accumulated other comprehensive loss(2,848)(3,876)
Total Shareholders' Equity2,913,3112,761,632
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY8,523,8758,301,824
Sierra Pacific Power Company [Member]
  
Current Assets:  
Cash and cash equivalents66,3119,552
Accounts receivable less allowance for uncollectible accounts:116,685129,306
Materials, supplies and fuel, at average cost65,25148,061
Risk management assets (Note 6)0531
Intercompany income taxes receivable10,35110,351
Deferred income taxes40,34353,282
Other current assets12,59711,633
Total Current Assets311,538262,716
Utility Property:  
Plant in service3,550,0953,516,421
Construction work-in-progress126,60583,500
Total3,676,7003,599,921
Less accumulated provision for depreciation1,264,9331,219,072
Total Utility Property, Net2,411,7672,380,849
Investments and other property, net5,5225,956
Deferred Charges and Other Assets:  
Regulatory assets314,762365,177
Regulatory asset for pension plans126,619131,734
Other deferred charges and assets33,13845,268
Total Deferred Charges and Other Assets474,519542,179
Assets Held for Sale (Note 10)0155,322
TOTAL ASSETS3,203,3463,347,022
Current Liabilities:  
Accounts payable86,14690,206
Accounts payable, affiliated companies28,78610,812
Accrued expenses29,27633,788
Dividends Declared054,000
Risk management liabilities (Note 6)25710,465
Deferred energy (Note 3)108,891144,490
Other current liabilities14,09516,029
Total Current Liabilities267,451359,790
Long-term debt (Note 4)1,179,6881,195,775
Commitments and Contingencies (Note 8)  
Deferred Credits and Other Liabilities:  
Deferred income taxes401,686395,454
Deferred investment tax credit10,37111,949
Accrued retirement benefits105,798110,302
Regulatory liabilities208,888202,131
Other deferred credits and liabilities68,07867,495
Total Deferred Credits and Other Liabilities794,821787,331
Liabilities Held for Sale (Note 10)030,706
Shareholders' Equity:  
Common stock44
Other paid-in capital1,111,5741,111,262
Retained earnings(149,802)(135,226)
Accumulated other comprehensive loss(390)(2,620)
Total Shareholders' Equity961,386973,420
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY$ 3,203,346$ 3,347,022