CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income (loss)	$ 167,475	$ 88,480
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	88,178	79,006
Amortization	5,744	13,343
Conservation amortization	34,107	34,402
Deferred income taxes and tax credits, net	70,591	32,564
Net unrealized (gain) loss on derivative instruments	(75,937)	(5,136)
Pension funding	(5,100)	(5,700)
Derivative contracts classified as financing activities due to merger	26,049	36,621
AFUDC - Equity	(6,524)	(9,306)
Regulatory assets	(6,411)	(48,185)
Regulatory liabilities	3,029	8,180
Other long-term assets	3,099	(3,625)
Other long-term liabilities	17,586	28,666
Change in certain current assets and liabilities:
Accounts receivable and unbilled revenue	31,548	32,439
Materials and supplies	1,827	(8,520)
Fuel and gas inventory	27,097	23,378
Income taxes	148	1,834
Prepayments and other	(3,732)	(2,840)
Purchased gas adjustment	(5,718)	30,210
Accounts payable	(47,935)	(68,073)
Taxes payable	16,746	13,877
Accrued expenses and other	(18,060)	1,989
Net cash provided by operating activities	323,807	273,604
Investing activities:
Construction expenditures - excluding equity AFUDC	(168,337)	(185,634)
Energy efficiency expenditures	(22,542)	(22,657)
Proceeds from Sale of Property, Plant, and Equipment	108,166	0
Restricted cash	599	(58)
Other	(4,248)	(17,606)
Net cash used in investing activities	(86,362)	(225,955)
Financing activities:
Change in short-term debt and leases, net	(157,895)	11,134
Dividends paid	(42,071)	0
Long-term notes and bonds issued	0	864,000
Redemption of bonds and notes	(29,000)	(848,000)
Derivative contracts classified as financing activities due to merger	(26,049)	(36,621)
Issuance cost of bonds and other	(3,984)	(4,933)
Net cash provided by (used in) financing activities	(258,999)	(14,420)
Net increase (decrease) in cash and cash equivalents	(21,554)	33,229
Cash and cash equivalents at beginning of period	135,542	37,235
Cash and cash equivalents at end of period	113,988	70,464
Supplemental cash flow information:
Cash payments for interest (net of capitalized interest)	78,346	74,588
Cash payments (refunds) for income taxes	0	(1,898)
PUGET SOUND ENERGY, INC. [Member]
Operating activities:
Net income (loss)	179,938	112,716
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	88,178	79,006
Amortization	5,744	13,343
Conservation amortization	34,107	34,402
Deferred income taxes and tax credits, net	79,761	46,430
Net unrealized (gain) loss on derivative instruments	(72,740)	10,135
Pension funding	(5,100)	(5,700)
AFUDC - Equity	(6,524)	(9,306)
Regulatory assets	(6,411)	(48,185)
Regulatory liabilities	3,029	8,180
Other long-term assets	2,922	(4,359)
Other long-term liabilities	18,162	15,118
Change in certain current assets and liabilities:
Accounts receivable and unbilled revenue	31,313	32,371
Materials and supplies	1,827	(8,520)
Fuel and gas inventory	27,097	23,378
Income taxes	148	1,834
Prepayments and other	(3,732)	(2,840)
Purchased gas adjustment	(5,718)	30,210
Accounts payable	(47,721)	(68,267)
Taxes payable	16,746	13,877
Accrued expenses and other	(8,783)	(12,594)
Net cash provided by operating activities	332,243	261,229
Investing activities:
Construction expenditures - excluding equity AFUDC	(168,337)	(185,634)
Energy efficiency expenditures	(22,542)	(22,657)
Proceeds from Sale of Property, Plant, and Equipment	108,166	0
Restricted cash	599	(58)
Other	(4,184)	(3,417)
Net cash used in investing activities	(86,298)	(211,766)
Financing activities:
Change in short-term debt and leases, net	(157,895)	11,134
Dividends paid	(105,648)	(71,467)
Issuance cost of bonds and other	(3,985)	817
Net cash provided by (used in) financing activities	(267,528)	(59,516)
Net increase (decrease) in cash and cash equivalents	(21,583)	(10,053)
Cash and cash equivalents at beginning of period	135,530	31,010
Cash and cash equivalents at end of period	113,947	20,957
Supplemental cash flow information:
Cash payments for interest (net of capitalized interest)	57,646	50,232
Cash payments (refunds) for income taxes	$ 0	$ (1,898)