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INCOME TAXES (BENEFITS) (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

		2012						2011						2010
		NVE		NPC		SPPC		NVE		NPC		SPPC		NVE		NPC		SPPC

Current and other
	Federal	$	(18.9)	$	(12.2)	$	(6.8)	$	(1.3)	$	(1.1)	$	(0.1)	$	(15.4)	$	(0.9)	$	1.1
	State		(0.4)		0.0		(0.4)		0.1		0.0		0.1		1.0		0.0		0.9
Total current and other			(19.3)		(12.2)		(7.2)		(1.2)		(1.1)		0.0		(14.4)		(0.9)		2.0
Deferred
	Federal		189.3		152.0		49.1		91.7		73.4		33.2		132.7		93.6		42.0
	State		0.0		0.0		0.0		(0.1)		(0.3)		0.2		(0.1)		0.7		(0.9)
Total deferred			189.3		152.0		49.1		91.6		73.1		33.4		132.6		94.3		41.1
Amortization of excess deferred taxes			(0.8)		(0.3)		(0.5)		(0.4)		(0.1)		(0.3)		(1.1)		(0.2)		(0.8)
Investment tax credits			(2.6)		(1.4)		(1.2)		(3.1)		(1.2)		(1.9)		(3.3)		(1.4)		(1.9)
Total provision for income taxes		$	166.6	$	138.1	$	40.2	$	86.9	$	70.7	$	31.2	$	113.8	$	91.8	$	40.4

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2012									2011									2010
	NVE			NPC			SPPC			NVE			NPC			SPPC			NVE			NPC			SPPC

Net income	$	321.9		$	257.7		$	84.4		$	163.4		$	132.6		$	59.9		$	227.0		$	185.9		$	72.4
Total income tax expense		166.6			138.1			40.2			86.9			70.7			31.2			113.8			91.8			40.4
Pretax income		488.5			395.8			124.6			250.3			203.3			91.1			340.8			277.7			112.8
Statutory tax rate		35.0	%		35.0	%		35.0	%		35.0	%		35.0	%		35.0	%		35.0	%		35.0	%		35.0	%
Federal income tax expense		171.0			138.5			43.6			87.6			71.2			31.9			119.3			97.2			39.5
Depreciation		2.4			3.5			(1.1)			3.1			2.0			1.1			4.1			1.8			2.3
AFUDC - equity		(3.2)			(2.3)			(0.9)			(3.8)			(2.9)			(0.9)			(9.8)			(8.8)			(1.0)
Investment tax credit amortization		(2.6)			(1.4)			(1.2)			(3.1)			(1.2)			(1.9)			(3.3)			(1.4)			(1.9)
Regulatory asset for goodwill		2.7			1.7			1.0			2.7			1.7			1.0			2.7			1.7			1.0
Research and development credit		(4.2)			(2.8)			(1.4)			(0.2)			(0.1)			(0.1)			(1.0)			(0.8)			(0.2)
Other – net		0.5			0.9			0.2			0.6			0.0			0.1			1.8			2.1			0.7
Provision for income taxes	$	166.6		$	138.1		$	40.2		$	86.9		$	70.7		$	31.2		$	113.8		$	91.8		$	40.4
Effective tax rate		34.1	%		34.9	%		32.3	%		34.7	%		34.8	%		34.2	%		33.4	%		33.1	%		35.8	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

			2012						2011
		NVE		NPC		SPPC		NVE		NPC		SPPC
Deferred tax assets
	Net operating loss and credit carryovers	$	384.9	$	264.2	$	61.1	$	470.8	$	353.7	$	62.5
	Employee benefit plans		92.0		35.5		38.5		58.4		21.2		26.5
	Customer advances		17.0		10.8		6.2		17.6		10.5		7.1
	Gross-ups received on CIAC & customer advances		19.4		13.8		5.6		20.3		15.3		5.0
	Deferred revenues		15.2		12.7		2.5		18.5		15.1		3.4
	Deferred energy		17.5		(0.3)		17.8		49.9		20.0		29.9
	Reserves		15.0		10.5		2.2		13.4		9.6		2.5
	Other		7.6		3.2		3.5		17.5		10.5		6.3
Total deferred tax assets			568.6		350.4		137.4		666.4		455.9		143.2
Regulatory deferred tax assets
	Excess deferred income taxes		7.8		2.2		5.6		8.7		2.5		6.2
	Unamortized investment tax credit		7.3		2.5		4.8		8.7		3.3		5.4
Total regulatory deferred tax assets			15.1		4.7		10.4		17.4		5.8		11.6
Total deferred tax assets before valuation allowance			583.7		355.1		147.8		683.8		461.7		154.8
Valuation allowance			(1.5)		(1.5)		0.0		(1.2)		(1.2)		0.0
Total deferred tax assets after valuation allowance		$	582.2	$	353.6	$	147.8	$	682.6	$	460.5	$	154.8

			2012						2011
		NVE		NPC		SPPC		NVE		NPC		SPPC
Deferred tax liabilities
	Excess of tax over book depreciation	$	1,481.7	$	1,071.1	$	416.2	$	1,380.7	$	1,015.1	$	371.6
	Deferred Conservation Programs		42.4		32.4		10.0		83.2		63.0		20.2
	Regulatory assets		168.4		115.0		54.2		137.1		94.1		44.2
	Other		30.4		19.1		10.8		32.0		19.4		12.1
Total deferred tax liabilities			1,722.9		1,237.6		491.2		1,633.0		1,191.6		448.1
Regulatory deferred tax liabilities
	Tax benefits flowed through to customers - property		137.1		85.9		51.2		147.2		93.0		54.3
	Tax benefits flowed through to customers - goodwill		132.6		83.3		49.3		136.0		85.0		50.9
Total regulatory deferred tax liability			269.7		169.2		100.5		283.2		178.0		105.2
Total deferred tax liabilities, including
regulatory deferred tax liabilities		$	1,992.6	$	1,406.8	$	591.7	$	1,916.2	$	1,369.6	$	553.3

Net deferred income tax liability		$	1,155.8	$	888.7	$	353.8	$	967.8	$	736.9	$	304.9
Net regulatory deferred tax liability			254.6		164.5		90.1		265.8		172.2		93.6
Total net deferred tax liability		$	1,410.4	$	1,053.2	$	443.9	$	1,233.6	$	909.1	$	398.5

Net Operating Loss and Tax Credit Carryovers

	Deferred		Valuation		Net Deferred		Expiration
	Tax Asset		Allowance		Tax Asset		Period
NVE

Federal net operating loss	$	369.3	$	-	$	369.3	2028-2032
Research and development credit		13.6		-		13.6	2028-2032
Arizona coal credits		2.0		1.5		0.5	2013-2017

Total net operating loss and tax credits	$	384.9	$	1.5	$	383.4

	Deferred		Valuation		Net Deferred		Expiration
	Tax Asset		Allowance		Tax Asset		Period
NPC

Federal net operating loss	$	253.3	$	-	$	253.3	2028-2032
Research and development credit		8.9		-		8.9	2028-2032
Arizona coal credits		2.0		1.5		0.5	2013-2017

Total net operating loss and tax credits	$	264.2	$	1.5	$	262.7

	Deferred		Valuation		Net Deferred			Expiration
	Tax Asset		Allowance		Tax Asset		Period
SPPC

Federal net operating loss	$	56.4	$	-	$	56.4		2028-2032
Research and development credit		4.7		-		4.7		2028-2032

Total net operating loss and tax credits	$	61.1	$	-	$	61.1

Summary of Unrecognized Tax Benefits

		2012						2011						2010
		NVE		NPC		SPPC		NVE		NPC		SPPC		NVE		NPC		SPPC

Unrecognized tax benefits		$	6.6	$	3.8	$	2.8	$	34.1	$	24.3	$	9.8	$	35.7	$	25.5	$	10.2
Of the total, amounts related to tax
positions that, if recognized, in future years would:
	Increase the effective tax rate	$	2.4	$	1.6	$	0.8	$	5.6	$	3.8	$	1.8	$	4.8	$	3.2	$	1.6

	2012						2011						2010
	NVE		NPC		SPPC		NVE		NPC		SPPC		NVE		NPC		SPPC

Unrecognized tax benefit at January 1	$	34.1	$	24.3	$	9.8	$	35.7	$	25.5	$	10.2	$	38.2	$	26.6	$	10.5
Increase in current period tax positions		1.1		0.8		0.3		0.5		0.4		0.1		0.3		0.1		0.2
Increase in prior period tax positions		1.6		(0.1)		1.7		0.2		0.1		0.1		0.1		0.1		0.1
Decrease in prior period tax positions		(30.2)		(21.2)		(9.0)		(2.3)		(1.7)		(0.6)		(2.9)		(1.3)		(0.6)
Unrecognized tax benefit at December 31	$	6.6	$	3.8	$	2.8	$	34.1	$	24.3	$	9.8	$	35.7	$	25.5	$	10.2

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

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