Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

	Year Ended December 31, 2010
Puget Energy (Dollars in Thousands)	Regulated Utility		Other			Total
Revenue	$	3,121,934	$	283		$	3,122,217
Depreciation and amortization	364,205		1			364,206
Income tax (benefit) expense	35,905		(33,424		)	2,481
Operating income	310,130		(1,896		)	308,234
Interest charges, net of AFUDC	220,922		86,088			307,010
Net income	92,927		(62,616		)	30,311
Total assets	10,180,532		1,748,804			11,929,336
Construction expenditures - excluding equity AFUDC	859,091		—			859,091

	Year Ended December 31, 2011
Puget Energy (Dollars in Thousands)	Regulated Utility		Other			Total
Revenue	$	3,319,105	$	(340	)	$	3,318,765
Depreciation and amortization	371,977		1			371,978
Income tax (benefit) expense	91,464		(57,704		)	33,760
Operating income	477,730		(2,790		)	474,940
Interest charges, net of AFUDC	210,463		131,498			341,961
Net income	228,908		(105,618		)	123,290
Total assets	10,648,493		1,736,217			12,384,710
Construction expenditures - excluding equity AFUDC	976,513		—			976,513

	Successor February 6, 2009 - December 31, 2009					Predecessor January 1, 2009 - February 5, 2009					Year Ended December 31, 2009
Puget Energy (Dollars in Thousands)	Regulated Utility		Other			Regulated Utility		Other			Total
Revenue	$	2,921,550	$	3,598		$	403,713	$	—		$	3,328,861
Depreciation and amortization	305,904		39			26,742		—			332,685
Income tax (benefit) expense	113,241		(31,200		)	10,537		(1,540		)	91,038
Operating income	477,082		(2,219		)	55,830		(20,420		)	510,273
Interest charges, net of AFUDC	176,858		79,953			16,966		(25		)	273,752
Net income	229,973		(55,958		)	31,611		(18,855		)	186,771
Total assets	10,117,563		1,782,577			8,507,548		87,288			11,900,140
Construction expenditures - excluding equity AFUDC	726,157		—			49,531		—			775,688

PUGET SOUND ENERGY, INC.

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

	Year Ended December 31, 2009
Puget Sound Energy (Dollars in Thousands)	Regulated Utility		Other			Total
Revenue	$	3,325,263	$	3,238		$	3,328,501
Depreciation and amortization	332,646		206			332,852
Income tax (benefit) expense	69,890		(2,246		)	67,644
Operating income	387,652		(4,517		)	383,135
Interest charges, net of AFUDC	202,527		—			202,527
Net income	161,508		(2,256		)	159,252
Total assets	8,765,189		51,382			8,816,571
Construction expenditures - excluding equity AFUDC	775,688		—			775,688

	Year Ended December 31, 2011
Puget Sound Energy (Dollars in Thousands)	Regulated Utility		Other			Total
Revenue	$	3,319,106	$	697		$	3,319,803
Depreciation and amortization	371,977		1			371,978
Income tax expense	78,451		(334		)	78,117
Operating income	431,553		(510		)	431,043
Interest charges, net of AFUDC	201,467		—			201,467
Net income	204,740		(620		)	204,120
Total assets	10,042,263		43,284			10,085,547
Construction expenditures - excluding equity AFUDC	976,513		—			976,513

	Year Ended December 31, 2010
Puget Sound Energy (Dollars in Thousands)	Regulated Utility		Other			Total
Revenue	$	3,121,935	$	282		$	3,122,217
Depreciation and amortization	364,204		2			364,206
Income tax (benefit) expense	60		62			122
Operating income	207,647		(56		)	207,591
Interest charges, net of AFUDC	220,854		—			220,854
Net income	26,358		(263		)	26,095
Total assets	9,260,675		50,109			9,310,784
Construction expenditures - excluding equity AFUDC	859,091		—			859,091