CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activities:
Net income (loss)	$ 88,480	$ 107,431
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	79,006	74,781
Amortization	13,343	17,973
Conservation amortization	34,402	32,213
Deferred income taxes and tax credits, net	32,564	45,710
Net unrealized (gain) loss on derivative instruments	(5,136)	(36,845)
Pension funding	(5,700)	(5,000)
Derivative contracts classified as financing activities due to merger	36,621	97,684
AFUDC - equity	(9,306)	(3,734)
Regulatory assets	(48,185)	7,558
Regulatory liabilities	8,180	(12,900)
Other long-term assets	(3,625)	(30,820)
Other long-term liabilities	28,666	12,670
Change in certain current assets and liabilities:
Accounts receivable and unbilled revenue	32,439	26,416
Materials and supplies	(8,520)	(4,483)
Fuel and gas inventory	23,378	35,575
Income taxes	1,834	63,257
Prepayments and other	(2,840)	(1,463)
Purchased gas adjustment	30,210	8,750
Accounts payable	(68,073)	(29,865)
Taxes payable	13,877	15,550
Accrued expenses and other	1,989	(14,562)
Net cash provided by operating activities	273,604	405,896
Investing activities:
Construction expenditures - excluding equity AFUDC	(185,634)	(317,710)
Energy efficiency expenditures	(22,657)	(18,794)
Restricted cash	(58)	545
Other	(17,606)	479
Net cash used in investing activities	(225,955)	(335,480)
Financing activities:
Change in short-term debt and leases, net	11,134	(120,400)
Dividends paid	0	(58,167)
Long-term notes and bonds issued	864,000	475,000
Redemption of bonds and notes	(848,000)	(260,000)
Derivative contracts classified as financing activities due to merger	(36,621)	(97,684)
Issuance cost of bonds and other	(4,933)	(2,123)
Net cash provided by (used in) financing activities	(14,420)	(63,374)
Net increase (decrease) in cash and cash equivalents	33,229	7,042
Cash and cash equivalents at beginning of period	37,235	36,557
Cash and cash equivalents at end of period	70,464	43,599
Supplemental cash flow information:
Cash payments for interest (net of capitalized interest)	74,588	67,829
Cash payments (refunds) for income taxes	(1,898)	(63,204)
PUGET SOUND ENERGY, INC. [Member]
Operating activities:
Net income (loss)	112,716	103,439
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	79,006	74,781
Amortization	13,343	17,973
Conservation amortization	34,402	32,213
Deferred income taxes and tax credits, net	46,430	46,415
Net unrealized (gain) loss on derivative instruments	10,135	(5,984)
Pension funding	(5,700)	(5,000)
AFUDC - equity	(9,306)	(3,734)
Regulatory assets	(48,185)	7,558
Regulatory liabilities	8,180	(12,900)
Other long-term assets	(4,359)	(33,989)
Other long-term liabilities	15,118	6,176
Change in certain current assets and liabilities:
Accounts receivable and unbilled revenue	32,371	26,418
Materials and supplies	(8,520)	(4,483)
Fuel and gas inventory	23,378	35,575
Income taxes	1,834	49,710
Prepayments and other	(2,840)	(1,463)
Purchased gas adjustment	30,210	8,750
Accounts payable	(68,267)	(29,979)
Taxes payable	13,877	15,550
Accrued expenses and other	(12,594)	(17,201)
Net cash provided by operating activities	261,229	309,825
Investing activities:
Construction expenditures - excluding equity AFUDC	(185,634)	(317,710)
Energy efficiency expenditures	(22,657)	(18,794)
Restricted cash	(58)	545
Other	(3,417)	1,944
Net cash used in investing activities	(211,766)	(334,015)
Financing activities:
Change in short-term debt and leases, net	11,134	(120,400)
Dividends paid	(71,467)	(74,619)
Long-term notes and bonds issued	0	300,000
Loan from (payment to) parent	0	7,400
Redemption of bonds and notes	0	(260,000)
Investment from parent	0	175,000
Issuance cost of bonds and other	817	(1,964)
Net cash provided by (used in) financing activities	(59,516)	25,417
Net increase (decrease) in cash and cash equivalents	(10,053)	1,227
Cash and cash equivalents at beginning of period	31,010	36,320
Cash and cash equivalents at end of period	20,957	37,547
Supplemental cash flow information:
Cash payments for interest (net of capitalized interest)	50,232	59,799
Cash payments (refunds) for income taxes	$ (1,898)	$ (49,657)