Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

	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	10,671,089		1,736,217			12,407,306
Construction expenditures - excluding equity AFUDC	976,513		—			976,513

	Year Ended December 31, 2012
Puget Energy (Dollars in Thousands)	Regulated Utility		Other			Total
Revenue	$	3,215,876	$	(720	)	$	3,215,156
Depreciation and amortization	393,770		1			393,771
Income tax (benefit) expense	154,805		(50,080		)	104,725
Operating income	718,622		(3,087		)	715,535
Interest charges, net of AFUDC	234,890		135,110			370,000
Net income	366,377		(92,556		)	273,821
Total assets	11,076,350		1,725,229			12,801,579
Construction expenditures - excluding equity AFUDC	859,791		—			859,791

	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	10,209,207		1,748,804			11,958,011
Construction expenditures - excluding equity AFUDC	859,091		—			859,091

PUGET SOUND ENERGY, INC.

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment

	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	9,289,350		50,109			9,339,459
Construction expenditures - excluding equity AFUDC	859,091		—			859,091

	Year Ended December 31, 2012
Puget Sound Energy (Dollars in Thousands)	Regulated Utility		Other			Total
Revenue	$	3,215,876	$	383		$	3,216,259
Depreciation and amortization	393,770		1			393,771
Income tax expense	149,731		(423		)	149,308
Operating income	694,035		(1,046		)	692,989
Interest charges, net of AFUDC	224,797		—			224,797
Net income	356,956		(786		)	356,170
Total assets	10,555,289		38,987			10,594,276
Construction expenditures - excluding equity AFUDC	859,791		—			859,791

	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 (benefit) 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	10,064,859		43,284			10,108,143
Construction expenditures - excluding equity AFUDC	976,513		—			976,513