Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 85	$ 93
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	151	148
Increase (decrease) in net liabilities from price risk management activities	63	(84)
Regulatory deferrals-price risk management activities	(63)	84
Deferred income taxes	22	20
Pension and other postretirement benefits	19	17
Allowance for equity funds used during construction	(9)	(15)
Regulatory deferral of settled derivative instruments	2	6
Other non-cash income and expenses, net	11	9
Changes in working capital:
Decrease in accounts receivable and unbilled revenues	32	55
Increase in Inventories	(19)	(20)
(Increase) decrease in margin deposits, net	(17)	7
Decrease in accounts payable and accrued liabilities	(22)	(29)
Other working capital items, net	7	6
Cash received to be returned to customers pursuant to the Residential Exchange Program	0	14
Other, net	(14)	(9)
Net cash provided by operating activities	248	302
Cash flows from investing activities:
Capital expenditures	(313)	(501)
Distribution from Nuclear decommissioning trust	50	0
Sales tax refund received related to Tucannon River Wind Farm	23	0
Sales of nuclear decommissioning trust securities	7	9
Purchases of nuclear decommissioning trust securities	(7)	(10)
Proceeds from sale of property	0	4
Other, net	2	4
Net cash used in investing activities	(238)	(494)
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	225
Payments on long-term debt	(387)	0
Dividends paid	(44)	(43)
Net cash (used in) provided by financing activities	(15)	182
Decrease in cash and cash equivalents	(5)	(10)
Cash and cash equivalents, beginning of period	127	107
Cash and cash equivalents, end of period	122	97
Supplemental cash flow information is as follows:
Cash paid for interest, net of amounts capitalized	56	45
Cash paid for income taxes	1	11
Non-cash investing and financing activities:
Accrued capital additions	58	105
Accrued dividends payable	$ 27	$ 23