CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities
Net income	$ 824,967	$ 798,179
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	769,706	740,623
Conservation and demand side management program amortization	4,582	5,024
Nuclear fuel amortization	92,278	76,447
Deferred income taxes	433,224	409,662
Amortization of investment tax credits	(4,329)	(4,973)
Allowance for equity funds used during construction	(68,852)	(63,147)
Equity earnings of unconsolidated subsidiaries	(22,650)	(22,379)
Dividends from unconsolidated subsidiaries	27,130	27,503
Share-based compensation expense	16,536	28,362
Net realized and unrealized hedging and derivative transactions	(1,354)	(12,011)
Changes in operating assets and liabilities:
Accounts receivable	(16,080)	(108,488)
Accrued unbilled revenues	112,406	87,652
Inventories	(57,677)	(69,918)
Other current assets	(25,901)	6,060
Accounts payable	(155,788)	(3,297)
Net regulatory assets and liabilities	162,134	100,648
Other current liabilities	14,683	129,984
Pension and other employee benefit obligations	(111,463)	(159,592)
Change in other noncurrent assets	44,009	26,537
Change in other noncurrent liabilities	(33,220)	10,032
Net cash provided by operating activities	2,004,341	2,002,908
Investing activities
Utility capital/construction expenditures	(2,301,339)	(2,454,198)
Proceeds from insurance recoveries	6,000	90,000
Allowance for equity funds used during construction	68,852	63,147
Purchases of investments in external decommissioning fund	(499,493)	(1,177,398)
Proceeds from the sale of investments in external decommissioning fund	494,554	1,172,597
Investment in WYCO Development LLC	(2,220)	(3,418)
Other, net	(1,110)	(1,524)
Net cash used in investing activities	(2,234,756)	(2,310,794)
Financing activities
Repayments of short-term borrowings, net	(62,000)	(300,000)
Proceeds from issuance of long-term debt	837,794	1,434,989
Repayments of long-term debt, including reacquisition premiums	(275,708)	(654,864)
Proceeds from issuance of common stock	178,639	229,420
Dividends paid	(417,586)	(382,148)
Net cash provided by financing activities	261,139	327,397
Net change in cash and cash equivalents	30,724	19,511
Cash and cash equivalents at beginning of period	107,144	82,323
Cash and cash equivalents at end of period	137,868	101,834
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(407,186)	(411,130)
Cash (paid) received for income taxes, net	(4,950)	16,851
Supplemental disclosure of non-cash investing and financing transactions:
Property, plant and equipment additions in accounts payable	407,706	299,209
Issuance of common stock for reinvested dividends and 401(k) plans	$ 42,772	$ 54,963