CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income (loss)	$ 146,171	$ 112,466
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	163,558	148,361
Amortization	24,890	36,423
Conservation amortization	62,921	56,084
Deferred income taxes and tax credits, net	52,657	43,278
Net unrealized (gain) loss on derivative instruments	(76,850)	(23,542)
Pension funding	(11,400)	(5,000)
Derivative contracts classified as financing activities due to merger	47,423	123,951
AFUDC - Equity	(14,485)	(12,033)
Regulatory assets	(61,856)	18,450
Regulatory liabilities	37,752	(3,203)
Other long-term assets	7,302	(23,919)
Other long-term liabilities	45,284	32,113
Change in certain current assets and liabilities:
Accounts receivable and unbilled revenue	174,353	169,838
Materials and supplies	(13,722)	6,416
Fuel and gas inventory	31,138	28,880
Income taxes	1,892	63,893
Prepayments and other	(4,190)	(2,154)
Purchased gas adjustment	23,671	18,716
Accounts payable	(86,438)	(51,557)
Taxes payable	(10,835)	(6,726)
Accrued expenses and other	6,621	10,632
Net cash provided by operating activities	545,857	741,367
Investing activities:
Construction expenditures - excluding equity AFUDC	(398,900)	(567,837)
Energy efficiency expenditures	(48,232)	(37,758)
Restricted cash	639	1,018
Other	(28,410)	1,525
Net cash used in investing activities	(474,903)	(603,052)
Financing activities:
Change in short-term debt and leases, net	9,211	(248,765)
Dividends paid	(88,444)	(116,691)
Long-term notes and bonds issued	1,314,000	1,087,000
Redemption of bonds and notes	(1,273,000)	(744,000)
Derivative contracts classified as financing activities due to merger	(47,423)	(123,951)
Issuance cost of bonds and other	(6,400)	(5,593)
Net cash provided by (used in) financing activities	(92,056)	(152,000)
Net increase (decrease) in cash and cash equivalents	(21,102)	(13,685)
Cash and cash equivalents at beginning of period	37,235	36,557
Cash and cash equivalents at end of period	16,133	22,872
Supplemental cash flow information:
Cash payments for interest (net of capitalized interest)	170,262	152,789
Cash payments (refunds) for income taxes	(1,898)	(64,018)
PUGET SOUND ENERGY, INC. [Member]
Operating activities:
Net income (loss)	193,588	154,352
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	163,558	148,361
Amortization	24,890	36,423
Conservation amortization	62,921	56,084
Deferred income taxes and tax credits, net	77,611	67,272
Net unrealized (gain) loss on derivative instruments	(49,715)	(15,632)
Pension funding	(11,400)	(5,000)
AFUDC - Equity	(14,485)	(12,033)
Regulatory assets	(61,856)	18,450
Regulatory liabilities	37,752	(3,203)
Other long-term assets	10,875	(24,644)
Other long-term liabilities	31,394	18,448
Change in certain current assets and liabilities:
Accounts receivable and unbilled revenue	174,193	169,612
Materials and supplies	(13,722)	6,416
Fuel and gas inventory	31,138	28,880
Income taxes	1,892	50,396
Prepayments and other	(4,190)	(2,154)
Purchased gas adjustment	23,671	18,716
Accounts payable	(86,555)	(51,865)
Taxes payable	(10,835)	(6,726)
Accrued expenses and other	(14,296)	(1,308)
Net cash provided by operating activities	566,429	650,845
Investing activities:
Construction expenditures - excluding equity AFUDC	(398,900)	(567,837)
Energy efficiency expenditures	(48,232)	(37,758)
Restricted cash	639	1,018
Other	(7,635)	12,042
Net cash used in investing activities	(454,128)	(592,535)
Financing activities:
Change in short-term debt and leases, net	9,211	(248,765)
Dividends paid	(137,329)	(164,121)
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	287,000
Issuance cost of bonds and other	(563)	203
Net cash provided by (used in) financing activities	(128,681)	(78,283)
Net increase (decrease) in cash and cash equivalents	(16,380)	(19,973)
Cash and cash equivalents at beginning of period	31,010	36,320
Cash and cash equivalents at end of period	14,630	16,347
Supplemental cash flow information:
Cash payments for interest (net of capitalized interest)	106,823	96,703
Cash payments (refunds) for income taxes	$ (1,898)	$ (50,421)