Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 98,086	$ 93,138
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of electric plant in service	60,775	60,136
Amortization of nuclear fuel	28,004	22,877
Extraordinary gain related to Texas regulatory assets, net of tax	0	(10,286)
Deferred income taxes, net	46,338	17,088
Allowance for equity funds used during construction	(6,441)	(7,645)
Other amortization and accretion	15,771	12,957
Other operating activities	1,104	(488)
Change in:
Accounts receivable	(43,710)	(42,661)
Inventories	(3,367)	(6)
Net undercollection of fuel revenues	(29,608)	(1,322)
Prepayments and other	(4,718)	(1,996)
Accounts payable	9,500	(11,733)
Taxes accrued	13,265	33,978
Interest accrued	1,078	2,338
Other current liabilities	(1,279)	1,406
Deferred charges and credits	(5,923)	(4,177)
Net cash provided by operating activities	178,875	163,604
Cash flows from investing activities:
Cash additions to utility property, plant and equipment	(129,651)	(124,839)
Cash additions to nuclear fuel	(33,925)	(33,889)
Capitalized interest and AFUDC:
Utility property, plant and equipment	(10,278)	(12,296)
Nuclear fuel	(3,864)	(1,282)
Allowance for equity funds used during construction	6,441	7,645
Decommissioning trust funds:
Purchases, including funding of $6.4 (2011 YTD) and $6.2 million (2010 YTD)	(77,314)	(55,207)
Sales and maturities	67,841	46,936
Other investing activities	636	56
Net cash used for investing activities	(180,114)	(172,876)
Cash flows from financing activities:
Repurchases of common stock	(64,783)	(30,217)
Dividends paid	(18,415)	0
Borrowings under the revolving credit facility:
Proceeds	88,723	37,810
Payments	(75,634)	(130,708)
Proceeds from issuance of long-term debt	0	110,000
Other financing activities	(92)	(2,455)
Net cash used for financing activities	(70,201)	(15,570)
Net decrease in cash and cash equivalents	(71,440)	(24,842)
Cash and cash equivalents at beginning of period	79,184	91,790
Cash and cash equivalents at end of period	$ 7,744	$ 66,948