Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 121	$ 131
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	227	224
Increase (decrease) in net liabilities from price risk management activities	71	(60)
Regulatory deferrals-price risk management activities	(71)	60
Deferred income taxes	31	31
Pension and other postretirement benefits	25	25
Allowance for equity funds used during construction	(15)	(26)
Regulatory deferral of settled derivative instruments	0	9
Decoupling mechanism deferrals, net of amortization	10	4
Other non-cash income and expenses, net	19	18
Changes in working capital:
Decrease in accounts receivable and unbilled revenues	37	32
Increase in Inventories	(12)	(18)
(Increase) decrease in margin deposits, net	(9)	4
Increase in accounts payable and accrued liabilities	13	18
Other working capital items, net	15	16
Cash (paid) received pursuant to the Residential Exchange Program	(3)	13
Proceeds received from Trojan spent fuel legal settlement	0	6
Other, net	(20)	(14)
Net cash provided by operating activities	439	473
Cash flows from investing activities:
Capital expenditures	(452)	(824)
Distribution from (contribution to) Nuclear decommissioning trust	50	(6)
Sales tax refund received related to Tucannon River Wind Farm	23	0
Sales of nuclear decommissioning trust securities	11	13
Purchases of nuclear decommissioning trust securities	(10)	(15)
Proceeds received from insurance recovery	0	3
Proceeds from sale of property	0	4
Other, net	1	4
Net cash used in investing activities	(377)	(821)
Cash flows from financing activities:
Proceeds from Issuance of common stock, net of issuance costs	271	0
Proceeds from issuance of long-term debt	145	405
Payments on long-term debt	(442)	0
Dividends paid	(70)	(66)
Debt Issuance Costs	(1)	(1)
Net cash (used in) provided by financing activities	(97)	338
Decrease in cash and cash equivalents	(35)	(10)
Cash and cash equivalents, beginning of period	127	107
Cash and cash equivalents, end of period	92	97
Supplemental cash flow information is as follows:
Cash paid for interest, net of amounts capitalized	67	52
Cash paid for income taxes	3	16
Non-cash investing and financing activities:
Accrued capital additions	25	76
Accrued dividends payable	$ 28	$ 23