SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2011

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

2011
														SPPC
		NVE		NVE		NPC		SPPC		SPPC		SPPC		Reconciling
		Consolidated		Other		Electric		Total		Electric		Gas		Eliminations(1)
Operating Revenues		$	2,943,307	$	15	$	2,054,393	$	888,899	$	716,417	$	172,482	$
Energy Costs:
	Fuel for power generation		680,585		-		498,487		182,098		182,098		-
	Purchased power		633,874		-		477,226		156,648		156,648		-
	Gas purchased for resale		125,155		-				125,155				125,155
	Deferred energy		(83,333)		-		(16,300)		(67,033)		(65,445)		(1,588)
Energy efficiency program costs			43,537		-		37,292		6,245		6,245
Total Costs			1,399,818		-		996,705		403,113		279,546		123,567
Gross Margin		$	1,543,489	$	15	$	1,057,688	$	485,786	$	436,871	$	48,915
Other operating expenses			411,115		4,289		260,127		146,699
Maintenance			103,307		-		64,320		38,987
Depreciation and amortization			357,937		-		252,191		105,746
Taxes other than income			60,465		290		37,254		22,921
Operating Income		$	610,665	$	(4,564)	$	443,796	$	171,433
Assets		$	11,635,128	$	8,523	$	8,442,597	$	3,184,008	$	2,818,927	$	302,062	$	63,019
Capital expenditures		$	620,516	$	-	$	475,118	$	145,398	$	132,083	$	13,315

2010
														SPPC
		NVE		NVE		NPC		SPPC		SPPC		SPPC		Reconciling
		Consolidated		Other		Electric		Total		Electric		Gas		Eliminations(1)
Operating Revenues		$	3,280,222	$	23	$	2,252,377	$	1,027,822	$	836,879	$	190,943	$
Energy Costs:
	Fuel for power generation		821,484		0		588,419		233,065		233,065		-
	Purchased power		648,881		0		505,239		143,642		143,642		-
	Gas purchased for resale		137,702		0				137,702				137,702
	Deferred energy		113,107		0		94,843		18,264		8,475		9,789
Total Costs			1,721,174		0		1,188,501		532,673		385,182		147,491
Gross Margin		$	1,559,048	$	23	$	1,063,876	$	495,149	$	451,697	$	43,452
Other operating expense			414,241		3,760		260,535		149,946
Maintenance			104,567		-		71,759		32,808
Depreciation and amortization			333,059		-		226,252		106,807
Taxes other than income			62,746		235		37,918		24,593
Operating Income		$	644,435	$	(3,972)	$	467,412	$	180,995
Assets		$	11,669,668	$	20,822	$	8,301,824	$	3,347,022	$	3,022,257	$	291,122	$	33,643
Capital expenditures(2)		$	629,496	$	(13,094)	$	499,374	$	143,216	$	131,579	$	11,637

2009
														SPPC
		NVE		NVE		NPC		SPPC		SPPC		SPPC		Reconciling
		Consolidated		Other		Electric		Total		Electric		Gas		Eliminations(1)
Operating Revenues		$	3,585,798	$	28	$	2,423,377	$	1,162,393	$	957,130	$	205,263	$
Energy Costs:
	Fuel for power generation		881,768		0		587,647		294,121		294,121		-
	Purchased power		758,736		0		627,759		130,977		130,977		-
	Gas purchased for resale		153,607		0				153,607				153,607
	Deferred energy		289,076		0		207,611		81,465		73,829		7,636
Total Costs			2,083,187		0		1,423,017		660,170		498,927		161,243
Gross Margin		$	1,502,611	$	28	$	1,000,360	$	502,223	$	458,203	$	44,020
Other operating expenses			453,413		2,699		279,865		170,849
Maintenance			102,309		-		71,019		31,290
Depreciation and amortization			321,921		-		215,873		106,048
Taxes other than income			60,885		197		37,241		23,447
Operating Income		$	564,083	$	(2,868)	$	396,362	$	170,589
Assets		$	11,413,463	$	(25,053)	$	8,096,371	$	3,342,145	$	2,997,116	$	305,434	$	39,595
Capital expenditures(2)		$	843,132	$	-	$	656,074	$	187,058	$	171,036	$	16,022

(1)	The reconciliation of segment assets at December 31, 2011, 2010 and 2009 to the consolidated total includes the following unallocated amounts:
			2011		2010		2009
		Other investments	$	5,901	$	5,956	$	5,428
		Cash		55,195		9,552		14,359
		Deferred charges-other		1,923		18,135		19,808
			$	63,019	$	33,643	$	39,595
(2)	The capital expenditures for NVE Other at December 31, 2010 includes $13.1 million proceeds from the sale of assets between SPPC and Sierra
	Pacific Communications.