CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
OPERATING REVENUES:
OPERATING REVENUES	$ 731,638		$ 740,698		$ 1,315,860		$ 1,352,118
Operating Expenses
Fuel for power generation	188,979		112,585		336,227		229,620
Purchased power	170,861		164,092		292,171		281,208
Gas purchased for resale	17,274		9,492		54,894		41,109
Deferred energy	(86,687)		10,490		(165,752)		(1,249)
Merger related costs	13,552		0		13,552		0
Energy efficiency program costs	12,599		24,600		22,444		44,025
Other operating expenses	106,798		103,371		211,470		206,972
Maintenance	24,046		24,650		48,952		57,176
Depreciation and amortization	98,884		96,316		194,886		187,178
Taxes other than income	15,846		14,266		32,322		28,775
Total Operating Expenses	562,152		559,862		1,041,166		1,074,814
OPERATING INCOME	169,486		180,836		274,694		277,304
OTHER INCOME (EXPENSE):
Interest expense (net of AFUDC-debt)	(73,530)		(74,564)		(146,867)		(152,495)
Interest income (expense) on regulatory items	(16)		(1,977)		(843)		(4,179)
AFUDC - equity	2,250		2,319		5,139		4,251
Other income	3,813		6,291		7,633		10,485
Other expense	(4,036)		(4,640)		(8,287)		(7,700)
Total Other Income (Expense)	(71,519)		(72,571)		(143,225)		(149,638)
Income Before Income Tax Expense	97,967		108,265		131,469		127,666
Income Tax Expense (Benefit)	34,734		38,826		46,761		46,054
NET INCOME	63,233		69,439		84,708		81,612
Other comprehensive income (loss):
Change in compensation retirement benefits liability and amortization	246		154		492		309
Change in market value of risk management assets and liabilities	297		(229)		496		(475)
Unrealized net gain/(loss) on investment	(65)		0		(65)		0
OTHER COMPREHENSIVE INCOME(LOSS)	478		(75)		923		(166)
COMPREHENSIVE INCOME	63,711		69,364		85,631		81,446
Amount per share basic and diluted
Net income per share - basic	$ 0.27		$ 0.29		$ 0.36		$ 0.35
Net income per share - diluted	$ 0.27		$ 0.29		$ 0.36		$ 0.34
Weighted Average Shares of Common Stock Outstanding - basic	235,489,559		235,999,750		235,342,448		235,999,750
Weighted Average Shares of Common Stock Outstanding - diluted	237,401,400	[1]	237,903,276	[1]	237,204,505	[1]	237,715,070	[1]
Dividends Declared Per Share of Common Stock	$ 0.19		$ 0.17		$ 0.38		$ 0.30
Nevada Power Company [Member]
OPERATING REVENUES:
OPERATING REVENUES	537,124		553,143		908,987		948,831
Operating Expenses
Fuel for power generation	144,246		81,258		249,777		161,807
Purchased power	129,396		135,276		210,804		216,807
Deferred energy	(63,748)		5,053		(109,103)		7,224
Merger related costs	8,867		0		8,867		0
Energy efficiency program costs	10,842		21,200		18,809		36,974
Other operating expenses	70,100		68,650		137,492		135,112
Maintenance	15,889		16,988		33,964		40,061
Depreciation and amortization	70,405		69,131		139,066		134,121
Taxes other than income	9,632		8,596		19,591		17,050
Total Operating Expenses	395,629		406,152		709,267		749,156
OPERATING INCOME	141,495		146,991		199,720		199,675
OTHER INCOME (EXPENSE):
Interest expense (net of AFUDC-debt)	(51,643)		(52,602)		(102,902)		(107,007)
Interest income (expense) on regulatory items	(181)		(1,849)		(983)		(3,865)
AFUDC - equity	1,826		1,577		4,192		2,990
Other income	978		5,392		3,382		7,101
Other expense	(1,833)		(2,993)		(4,234)		(4,339)
Total Other Income (Expense)	(50,853)		(50,475)		(100,545)		(105,120)
Income Before Income Tax Expense	90,642		96,516		99,175		94,555
Income Tax Expense (Benefit)	31,977		34,219		35,065		33,574
NET INCOME	58,665		62,297		64,110		60,981
Other comprehensive income (loss):
Change in compensation retirement benefits liability and amortization	97		64		194		127
COMPREHENSIVE INCOME	58,762		62,361		64,304		61,108
Sierra Pacific Power Company [Member]
OPERATING REVENUES:
Electric	174,302		168,007		346,929		337,813
Gas	20,208		19,544		59,937		65,466
OPERATING REVENUES	194,510		187,551		406,866		403,279
Operating Expenses
Fuel for power generation	44,733		31,327		86,450		67,813
Purchased power	41,465		28,816		81,367		64,401
Gas purchased for resale	17,274		9,492		54,894		41,109
Deferral of energy - electric-net	(16,963)		4,314		(36,298)		(8,356)
Deferral of energy - gas-net	(5,976)		1,123		(20,351)		(117)
Merger related costs	3,520		0		3,520		0
Energy efficiency program costs	1,757		3,400		3,635		7,051
Other operating expenses	36,256		33,654		72,061		70,086
Maintenance	8,157		7,662		14,988		17,115
Depreciation and amortization	28,479		27,185		55,820		53,057
Taxes other than income	6,175		5,625		12,470		11,488
Total Operating Expenses	164,877		152,598		328,556		323,647
OPERATING INCOME	29,633		34,953		78,310		79,632
OTHER INCOME (EXPENSE):
Interest expense (net of AFUDC-debt)	(15,373)		(15,379)		(30,898)		(32,352)
Interest income (expense) on regulatory items	165		(128)		140		(314)
AFUDC - equity	424		742		947		1,261
Other income	2,518		599		3,658		2,782
Other expense	(1,573)		(1,276)		(2,821)		(2,611)
Total Other Income (Expense)	(13,839)		(15,442)		(28,974)		(31,234)
Income Before Income Tax Expense	15,794		19,511		49,336		48,398
Income Tax Expense (Benefit)	5,018		6,832		16,656		17,075
NET INCOME	10,776		12,679		32,680		31,323
Other comprehensive income (loss):
Change in compensation retirement benefits liability and amortization	58		43		117		85
COMPREHENSIVE INCOME	$ 10,834		$ 12,722		$ 32,797		$ 31,408

[1] The denominator does not include stock equivalents for options issued under the non-qualified stock option plan due to conversion prices being higher than market prices for the periods ending June 30, 2012. If the conditions for conversion were met under this plan, 327,503 and 330,322 shares, would be included for the three and six months ended June 30, 2012, respectively.