REGULATORY ACTIONS (Tables)

12 Months Ended

Dec. 31, 2011

REGULATORY ACTIONS [Abstract]

Summary of Deferred Energy Amounts

				2011
			NVE Total		NPC Electric			SPPC Electric		SPPC Gas
Deferred Energy
	Cumulative Balance authorized in 2011 DEAA		$	(334,102)	$	(189,032)	(1)	$	(115,955)	$	(29,115)
	2011 Amortization			247,489		120,340			104,909		22,240
	2011 Deferred Energy Over Collections(2)			(173,466)		(106,022)			(45,291)		(22,153)
Deferred Energy Balance at December 31, 2011 - Subtotal			$	(260,079)	$	(174,714)		$	(56,337)	$	(29,028)
Reinstatement of deferred energy (effective 6/07, 10 years)				117,440		117,440			-		-
		Total Deferred Energy	$	(142,639)	$	(57,274)		$	(56,337)	$	(29,028)
Deferred Assets
	Deferred energy		$	102,525	$	102,525		$	-	$	-
Current Liabilities
	Deferred energy			(245,164)		(159,799)			(56,337)		(29,028)
		Total Deferred Energy	$	(142,639)	$	(57,274)		$	(56,337)	$	(29,028)

				2010
			NVE Total		NPC Electric			SPPC Electric		SPPC Gas
Nevada Deferred Energy
	Cumulative Balance authorized in 2010 DEAA(1)		$	(220,064)	$	(102,398)	(2)	$	(100,625)	$	(17,041)
	2010 Amortization			74,215		22,441			40,682		11,092
	2010 Deferred Energy Over Collections(3)			(184,776)		(106,178)			(55,615)		(22,983)
Nevada Deferred Energy Balance at December 31, 2010 - Subtotal			$	(330,625)	$	(186,135)		$	(115,558)	$	(28,932)
Cumulative CPUC balance(4)				(3,210)		-			(3,210)		-
Reinstatement of deferred energy (effective 6/07, 10 years)				132,409		132,409			-		-
		Total Deferred Energy	$	(201,426)	$	(53,726)		$	(118,768)	$	(28,932)
Deferred Assets
	Deferred energy		$	117,623	$	117,623		$	0	$	0
Current Liabilities
	Deferred energy			(315,839)		(171,349)			(115,558)		(28,932)
	Liabilities held for sale			(3,210)		-			(3,210)		-
		Total Deferred Energy	$	(201,426)	$	(53,726)		$	(118,768)	$	(28,932)

Schedule of Regulatory Assets and Liabilities [Text Block]

		NVE
		OTHER REGULATORY ASSETS AND LIABILITIES
		As of December 31, 2011
		Remaining	Receiving Regulatory Treatment				Pending					As of
DESCRIPTION		Amortization	Earning a		Not Earning		Regulatory			2011		December 31, 2010
		Period	Return(1)		a Return		Treatment			Total		Total
Regulatory assets
	Loss on reacquired debt	Term of Related Debt	$	72,408	$	-	$	-		$	72,408	$	84,692
	Income taxes	Various		-		251,314		-			251,314		257,078
	Merger costs	Various thru 2046		-		268,668		-			268,668		282,535
	Lenzie Generating Station	2042		-		67,351		-			67,351		77,524
	Mohave Generating Station and deferred costs	2017		9,861		12,654		1,645	(2)		24,160		25,849
	Piñon Pine	Various thru 2029		27,377		7,016		-			34,393		38,960
	Asset retirement obligations	-		-		-		67,891	(2)		67,891		55,182
	Conservation programs	Various thru 2017		151,035		-		7,412	(3)		158,447		177,515
	EEPR	Various thru 2013		30,379		-		-			30,379		30,409
	Ely Energy Center	2017		-		23,403		34,563	(2)		57,966		-
	Legacy Meters	-		-		-		21,777	(2)		21,777		-
	Renewable energy programs	2013		29,592		-		-			29,592		2,627
	Peabody coal costs	-		-		17,899		-			17,899		17,738
	Deferred Rate Increase	2011		12,177		-		-			12,177		91,678
	Risk management	-		-		2,426		-			2,426		30,726
	Other costs	Various thru 2031		24,229		33,852		11,198	(2, 3)		69,279		64,646
	Subtotal	-	$	357,058	$	684,583	$	144,486		$	1,186,127	$	1,237,159
	Pensions	-		-		215,656		-			215,656		269,472
Total regulatory assets			$	357,058	$	900,239	$	144,486		$	1,401,783	$	1,506,631
Regulatory liabilities
	Cost of removal	Various	$	422,033	$	-	$	-		$	422,033	$	382,634
	Income taxes	Various		-		17,433		-			17,433		19,506
	Gain on property sales	2013		4,444		-		32,844	(3)		37,288		7,151
	Renewable energy programs	2012		1,046		-		-			1,046		10,234
	Other	Various thru 2017		6,183		-		2,276			8,459		8,589
Total regulatory liabilities			$	433,706	$	17,433	$	35,120		$	486,259	$	428,114

		NPC
		OTHER REGULATORY ASSETS AND LIABILITIES
		As of December 31, 2011
		Remaining	Receiving Regulatory Treatment				Pending					As of
DESCRIPTION		Amortization	Earning a		Not Earning		Regulatory			2011		December 31, 2010
		Period	Return(1)		a Return		Treatment			Total		Total
Regulatory assets
	Loss on reacquired debt	Term of Related Debt	$	39,958	$	-	$	-		$	39,958	$	43,765
	Income taxes	Various		-		178,060		-			178,060		174,022
	Merger costs	Various thru 2044		-		168,212		-			168,212		176,974
	Lenzie Generating Station	2042		-		67,351		-			67,351		77,524
	Mohave Generating Station and deferred costs	Various thru 2017		9,861		12,654		1,645	(2)		24,160		25,849
	Asset retirement obligations	-		-		-		60,797	(2)		60,797		48,970
	Conservation programs	Various thru 2017		129,885		-		4,004	(3)		133,889		144,107
	EEPR	Various thru 2013		25,250		-		-			25,250		24,905
	Ely Energy Center	2017		-		23,403		22,970	(2)		46,373		-
	Legacy Meters	-		-		-		21,777	(2)		21,777		-
	Renewable energy programs	2013		10,694		-		-			10,694		-
	Peabody coal costs	-		-		17,899		-			17,899		17,738
	Risk management	-		-		2,426		-			2,426		20,261
	Deferred Rate Increase	2011		12,177		-		-			12,177		91,678
	Other costs	2017		13,324		21,772		8,870	(2, 3)		43,966		26,189
	Subtotal	-	$	241,149	$	491,777	$	120,063		$	852,989	$	871,982
	Pensions	-		-		108,528		-			108,528		133,410
Total regulatory assets			$	241,149	$	600,305	$	120,063		$	961,517	$	1,005,392
Regulatory liabilities
	Cost of removal	Various	$	232,093	$	-	$	-		$	232,093	$	208,795
	Income taxes	Various		-		5,798		-			5,798		6,557
	Gain on property sales	-		-		-		32,844	(3)		32,844		0
	Renewable energy programs	2013		1,046		-		-			1,046		7,797
	Other	2017		925		-		2,245			3,170		2,834
Total regulatory liabilities			$	234,064	$	5,798	$	35,089		$	274,951	$	225,983

		SPPC
		OTHER REGULATORY ASSETS AND LIABILITIES
		As of December 31, 2011
		Remaining	Receiving Regulatory Treatment				Pending					As of
DESCRIPTION		Amortization	Earning a		Not Earning		Regulatory			2011		December 31, 2010
		Period	Return(1)		a Return		Treatment			Total		Total
Regulatory assets
	Loss on reacquired debt	Term of Related Debt	$	32,450	$	-	$	-		$	32,450	$	40,927
	Income taxes	Various		-		73,254		-			73,254		83,056
	Merger costs	Various thru 2046		-		100,456		-			100,456		105,561
	Risk management	-		-		-		-			-		10,465
	Piñon Pine	Various thru 2029		27,377		7,016		-			34,393		38,960
	Asset retirement obligations	-		-		-		7,094	(2)		7,094		6,212
	Conservation programs	Various thru 2013		21,150		-		3,408	(3)		24,558		33,408
	EEPR	Various thru 2013		5,129		-		-			5,129		5,504
	Renewable energy programs	2013		18,898		-		-			18,898		2,627
	Ely Energy Center	-		-		-		11,593	(2)		11,593		-
	Other costs	Various thru 2031		10,905		12,080		2,328	(2, 3)		25,313		38,457
	Subtotal	-	$	115,909	$	192,806	$	24,423		$	333,138	$	365,177
	Pensions	-		-		104,159		-			104,159		131,734
Total regulatory assets			$	115,909	$	296,965	$	24,423		$	437,297	$	496,911
Regulatory liabilities
	Cost of removal	Various	$	189,940	$	-	$	-		$	189,940	$	173,839
	Income taxes	Various		-		11,635		-			11,635		12,949
	Gain on property sales	2013		4,444		-		-			4,444		7,151
	Renewable energy programs	-		-		-		-			-		2,437
	Other costs	Various thru 2043		5,258		-		31	(3)		5,289		5,755
Total regulatory liabilities			$	199,642	$	11,635	$	31		$	211,308	$	202,131

Summary of Rate Filings

			Effective Date	Authorized Revenue Requirement			Present Revenue Requirement		$ Change in Revenue Requirement
Revenue Requirement Subject To Change:
	DEAA		Oct. 2011	$	(188.9)		$	(101.0)	$	(87.9)
	REPR		Oct. 2011		8.6			29.8		(21.2)
	TRED		Oct. 2011		18.1			16.3		1.8
	EEPR Base		Oct. 2011		58.4			58.4		-
	EEPR Amortization		Oct. 2011		21.3			-		21.3
	EEIR Base		Oct. 2011		17.1			14.5		2.6
	EEIR Amortization		Oct. 2011		4.8	(1)		-		4.8
		Total Revenue Requirement		$	(60.6)		$	18.0	$	(78.6)

				Authorized			Present		$ Change in
			Effective	Revenue			Revenue		Revenue
			Date	Requirement			Requirement		Requirement
Revenue Requirement Subject To Change:
	DEAA		Oct. 2011	$	(115.9)		$	(99.5)	$	(16.4)
	REPR		Oct. 2011		38.0			36.6		1.4
	TRED		Oct. 2011		9.1			7.9		1.2
	EEPR Base		Oct. 2011		9.7			9.7		-
	EEPR Amortization		Oct. 2011		4.6			-		4.6
	EEIR Base		Oct. 2011		3.1			2.6		0.5
	EEIR Amortization		Oct. 2011		0.5	(1)		-		0.5
		Total Revenue Requirement		$	(50.9)		$	(42.7)	$	(8.2)

				Authorized		Present		$ Change in
			Effective	Revenue		Revenue		Revenue
			Date	Requirement		Requirement		Requirement
Revenue Requirement Subject To Change:
	DEAA		Oct. 2011	$	(29.1)	$	(16.7)	$	(12.4)
	STPR		Oct. 2011		0.3		-		0.3
		Total Revenue Requirement		$	(28.8)	$	(16.7)	$	(12.1)