CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities
Net income	$ 456,385	$ 433,427
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	509,914	507,658
Conservation and demand side management program amortization	3,131	3,425
Nuclear fuel amortization	60,466	49,485
Deferred income taxes	236,479	235,684
Amortization of investment tax credits	(2,886)	(3,314)
Allowance for equity funds used during construction	(45,515)	(41,863)
Equity earnings of unconsolidated subsidiaries	(15,249)	(15,106)
Dividends from unconsolidated subsidiaries	18,114	18,683
Share-based compensation expense	10,990	18,747
Net realized and unrealized hedging and derivative transactions	(2,403)	(2,754)
Changes in operating assets and liabilities:
Accounts receivable	1,406	(78,940)
Accrued unbilled revenues	77,557	37,069
Inventories	75,268	40,684
Other current assets	(32,157)	29,700
Accounts payable	(147,734)	1,625
Net regulatory assets and liabilities	63,675	76,693
Other current liabilities	(129,981)	(83,336)
Pension and other employee benefit obligations	(115,455)	(170,162)
Change in other noncurrent assets	47,855	16,983
Change in other noncurrent liabilities	(30,349)	(163)
Net cash provided by operating activities	1,039,511	1,074,225
Investing activities
Utility capital/construction expenditures	(1,575,748)	(1,596,778)
Proceeds from insurance recoveries	6,000	50,000
Allowance for equity funds used during construction	45,515	41,863
Purchases of investments in external decommissioning fund	(404,780)	(890,700)
Proceeds from the sale of investments in external decommissioning fund	401,488	887,500
Investment in WYCO Development LLC	(2,132)	(2,166)
Other, net	(1,568)	(1,696)
Net cash used in investing activities	(1,531,225)	(1,511,977)
Financing activities
Proceeds from (repayments of) short-term borrowings, net	18,800	(248,000)
Proceeds from issuance of long-term debt	838,582	1,337,045
Repayments of long-term debt, including reacquisition premiums	(275,484)	(651,516)
Proceeds from issuance of common stock	176,573	227,113
Dividends paid	(274,361)	(250,392)
Net cash provided by financing activities	484,110	414,250
Net change in cash and cash equivalents	(7,604)	(23,502)
Cash and cash equivalents at beginning of period	107,144	82,323
Cash and cash equivalents at end of period	99,540	58,821
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(251,461)	(258,124)
Cash (paid) received for income taxes, net	(4,704)	13,681
Supplemental disclosure of non-cash investing and financing transactions:
Property, plant and equipment additions in accounts payable	305,447	302,434
Issuance of common stock for reinvested dividends and 401(k) plans	$ 29,272	$ 37,504