CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating revenue:
Electric	$ 614,634	$ 611,527
Gas	384,765	435,966
Other	419	1,019
Total operating revenue	999,818	1,048,512
Energy costs:
Purchased electricity	175,043	199,115
Electric generation fuel	59,087	69,937
Residential exchange	(22,551)	(23,335)
Purchased gas	189,983	233,519
Unrealized (gain) loss on derivative instruments, net	(75,692)	4,726
Utility operations and maintenance	129,235	128,046
Non-utility expense and other	(994)	861
Depreciation	88,178	79,006
Amortization	5,744	13,343
Conservation amortization	34,107	34,402
Taxes other than income taxes	99,943	99,869
Total operating expenses	682,083	839,489
Operating income	317,735	209,023
Other income (deductions):
Other income	12,012	14,937
Other expense	(1,542)	(3,754)
Non-hedged interest rate derivative expense	1,028	527
Interest charges:
AFUDC	4,648	7,295
Interest expense	(95,816)	(107,201)
Income (loss) before income taxes	238,065	120,827
Income tax (benefit) expense	70,590	32,347
Net income (loss)	167,475	88,480
PUGET SOUND ENERGY, INC. [Member]
Operating revenue:
Electric	614,634	611,527
Gas	384,765	435,966
Other	308	1,019
Total operating revenue	999,707	1,048,512
Energy costs:
Purchased electricity	175,043	199,115
Electric generation fuel	59,087	69,937
Residential exchange	(22,551)	(23,335)
Purchased gas	189,983	233,519
Unrealized (gain) loss on derivative instruments, net	(72,740)	10,135
Utility operations and maintenance	129,235	128,046
Non-utility expense and other	3,091	3,230
Depreciation	88,178	79,006
Amortization	5,744	13,343
Conservation amortization	34,107	34,402
Taxes other than income taxes	99,943	99,869
Total operating expenses	689,120	847,267
Operating income	310,587	201,245
Other income (deductions):
Other income	12,012	14,933
Other expense	(1,542)	(3,754)
Interest charges:
AFUDC	4,648	7,295
Interest expense	(65,977)	(60,737)
Interest expense on parent note	(29)	(51)
Income (loss) before income taxes	259,699	158,931
Income tax (benefit) expense	79,761	46,215
Net income (loss)	$ 179,938	$ 112,716