SCHEDULE I CONDENSED FINANCIAL INFORMATION OF PUGET ENERGY - Condensed Statements of Cash Flows (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Operating activities:
Net income	$ 273,821,000		$ 123,290,000		$ 30,311,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Unrealized gain on derivative instruments	(146,680,000)		45,043,000		50,495,000
Deferred income taxes and tax credits - net	100,457,000		31,774,000		(32,955,000)
Income taxes	6,174,000		65,213,000		58,434,000
Accounts payable	(25,963,000)		1,098,000		(26,396,000)
Net cash provided by operating activities	888,691,000		1,010,328,000		865,949,000
Investing activities:
Net cash used in investing activities	(798,976,000)		(1,076,815,000)		(905,767,000)
Financing activities:
Dividends paid	(88,594,000)		(117,441,000)		(104,311,000)
Long-term notes and bonds issued	1,314,000,000		1,382,000,000		1,025,000,000
Redemption of term-loan	(1,273,000,000)		(769,000,000)		(675,000,000)
Issue costs	430,000		(18,033,000)		(18,161,000)
Net cash provided by (used in) financing activities	8,592,000		67,165,000		(2,152,000)
Net increase (decrease) in cash and cash equivalents	98,307,000		678,000		(41,970,000)
Cash and cash equivalents at beginning of period	37,235,000		36,557,000		78,527,000
Cash and cash equivalents at end of period	135,542,000		37,235,000		36,557,000
PUGET SOUND ENERGY, INC.
Operating activities:
Net income	356,170,000		204,120,000		26,095,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Unrealized gain on derivative instruments	(119,120,000)		54,146,000		166,953,000
Deferred income taxes and tax credits - net	145,040,000		77,174,000		(16,284,000)
Income taxes	6,174,000		51,144,000		37,834,000
Accounts payable	(25,972,000)		688,000		(25,780,000)
Net cash provided by operating activities	903,888,000		903,422,000		575,775,000
Investing activities:
Net cash used in investing activities	(778,075,000)		(1,060,588,000)		(905,767,000)
Financing activities:
Dividends paid	(175,625,000)		(212,875,000)		(186,733,000)
Long-term notes and bonds issued	0		595,000,000		575,000,000
Redemption of term-loan	0		(285,000,000)		(232,000,000)
Issue costs	6,295,000		(12,018,000)		(10,003,000)
Net cash provided by (used in) financing activities	(21,293,000)		151,856,000		287,905,000
Net increase (decrease) in cash and cash equivalents	104,520,000		(5,310,000)		(42,087,000)
Cash and cash equivalents at beginning of period	31,010,000		36,320,000		78,407,000
Cash and cash equivalents at end of period	135,530,000		31,010,000		36,320,000
Purchase accounting adjustments	9,400,000		24,200,000		66,600,000
PUGET ENERGY
Operating activities:
Net income	273,821,000		123,290,000		30,311,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Unrealized gain on derivative instruments	(12,984,000)		33,549,000		(3,599,000)
Deferred income taxes and tax credits - net	(49,496,000)		(57,151,000)		(52,364,000)
Equity in earnings of subsidiary	(365,590,000)	[1],[2]	(228,288,000)	[1],[2]	(92,700,000)	[1],[2]
Other	11,409,000		12,837,000		18,169,000
Dividends received from subsidiaries	175,625,000		212,875,000		186,733,000
Accounts receivable	283,000		618,000		(891,000)
Income taxes	0		14,069,000		20,601,000
Accounts payable	212,000		0		(48,000)
Accrued interest	12,941,000		9,045,000		(926,000)
Net cash provided by operating activities	46,221,000		120,844,000		105,286,000
Investing activities:
Investment in subsidiaries	0		(287,000,000)		0
(Increase) decrease in loan to subsidiaries	400,000		(7,400,000)		300,000
Net cash used in investing activities	400,000		(294,400,000)		300,000
Financing activities:
Dividends paid	(88,594,000)		(117,441,000)		(104,311,000)
Long-term notes and bonds issued	884,000,000		787,000,000		450,000,000
Redemption of term-loan	(843,000,000)		(484,000,000)		(443,000,000)
Issue costs	(5,239,000)		(6,016,000)		(8,157,000)
Net cash provided by (used in) financing activities	(52,833,000)		179,543,000		(105,468,000)
Net increase (decrease) in cash and cash equivalents	(6,212,000)		5,987,000		118,000
Cash and cash equivalents at beginning of period	6,224,000		237,000		119,000
Cash and cash equivalents at end of period	$ 12,000		$ 6,224,000		$ 237,000

[1] Equity earnings of subsidiary included earnings from PSE of $356.2 million, $204.1 million and $26.1 million for the years ended December 31, 2012, 2011 and 2010, respectively, and business combination accounting adjustments under ASC 805 recorded at Puget Energy for PSE of $9.4 million, $24.2 million and $66.6 million for the years ended December 31, 2012, 2011 and 2010, respectively.

[2] Equity earnings of subsidiary included earnings from PSE of $356.2 million and $204.1 million for the years ended December 31, 2012 and 2011, respectively, and business combination accounting adjustments under ASC 805 recorded at Puget Energy for PSE of $9.4 million and $24.2 million for the years ended December 31, 2012 and 2011, respectively.