CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Parent [Line Items]
Net income (loss)	$ 57,692	$ 5,035	$ 146,171	$ 112,466
Other comprehensive income (loss):
Reclassification of net unrealized (gain) loss on interest rate swaps during the period, net of tax	7,088	15,760	9,596	19,993
Net unrealized gain (loss) from pension and postretirement plans, net of tax	(104)	(263)	(209)	(525)
Reclassification of net unrealized (gain) loss on energy derivative instruments settled during the period, net of tax	122	177	(73)	364
Other comprehensive income (loss)	7,106	15,674	9,314	19,832
Comprehensive income (loss)	64,798	20,709	155,485	132,298
PUGET SOUND ENERGY, INC. [Member]
Parent [Line Items]
Net income (loss)	80,872	50,913	193,588	154,352
Other comprehensive income (loss):
Net unrealized gain (loss) from pension and postretirement plans, net of tax	1,227	1,729	3,643	3,127
Reclassification of net unrealized (gain) loss on energy derivative instruments settled during the period, net of tax	2,869	3,185	4,791	15,774
Amortization of treasury interest rate swaps to earnings, net of tax	79	80	159	160
Other comprehensive income (loss)	4,175	4,994	8,593	19,061
Comprehensive income (loss)	$ 85,047	$ 55,907	$ 202,181	$ 173,413