CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 382,547	$ 362,354
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	309,048	287,141
Demand side management program amortization	2,776	3,309
Deferred income taxes	185,212	120,585
Amortization of Investment Tax Credits	(2,200)	(2,202)
Allowance for equity funds used during construction	(10,155)	(36,697)
Net realized and unrealized hedging and derivative transactions	3,255	(6,946)
Changes in operating assets and liabilities:
Accounts receivable	61,044	55,070
Accrued unbilled revenues	92,819	58,758
Inventories	1,215	(26,409)
Prepayments and other	75,488	1,001
Accounts payable	(78,610)	(86,984)
Net regulatory assets and liabilities	43,125	110,692
Other current liabilities	(36,587)	(43,323)
Pension and other employee benefit obligations	(22,653)	(37,769)
Change in other noncurrent assets	2,273	5,353
Change in other noncurrent liabilities	(30,667)	(15,355)
Net cash provided by operating activities	977,930	748,578
Investing activities
Utility capital/construction expenditures	(668,381)	(832,270)
Allowance for equity funds used during construction	10,155	36,697
Investments in utility money pool arrangement	(150,300)	(587,000)
Repayments from utility money pool arrangement	166,300	659,000
Net cash used in investing activities	(642,226)	(723,573)
Financing activities
(Repayments of) proceeds from short-term borrowings, net	(382,000)	253,000
Borrowings under utility money pool arrangement	67,000	303,000
Repayments under utility money pool arrangement	(67,000)	(292,000)
Proceeds from issuance of long-term debt	246,826	295,601
Repayments of Long-term Debt	0	(275,000)
Proceeds from Contributions from Parent	73,718	35,486
Dividends paid to parent	(247,174)	(355,547)
Net cash used in financing activities	(308,630)	(35,460)
Net change in cash and cash equivalents	27,074	(10,455)
Cash and cash equivalents at beginning of period	7,635	21,089
Cash and cash equivalents at end of period	34,709	10,634
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(145,569)	(136,045)
Cash received (paid) for income taxes, net	38,349	(67,717)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 104,965	$ 125,498