Condensed Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net margin	$ 28,828	$ 22,004
Adjustments to reconcile net margin to net cash provided by (used in) operating activities:
Depreciation and amortization, including nuclear fuel	144,131	123,717
Accretion cost	9,125	8,566
Amortization of deferred gains	(2,830)	(2,830)
Allowance for equity funds used during construction	(1,404)	(994)
Deferred outage costs	(36,672)	(25,080)
Deferral of effect on net margin for Hawk Road and Murray Energy facilities	(11,072)	6,071
Gain on sale of investments	(10,324)	(9,015)
Regulatory deferral of costs associated with nuclear decommissioning	5,553	4,422
Other	(3,622)	(2,438)
Change in operating assets and liabilities:
Receivables	(54,078)	(44,018)
Inventories	1,171	15,153
Prepayments and other current assets	(215)	(1,946)
Accounts payable	19,553	5,935
Accrued interest	(22,796)	(1,358)
Accrued and withheld taxes	(7,920)	(9,982)
Member power bill prepayments	(41,957)	(90,357)
Other current liabilities	1,376	(5,197)
Total adjustments	(11,981)	(29,351)
Net cash provided by (used in) operating activities	16,847	(7,347)
Cash flows from investing activities:
Property additions	(397,229)	(335,145)
Plant acquisition	(529,310)
Activity in decommissioning fund - Purchases	(557,748)	(299,446)
Activity in decommissioning fund - Proceeds	554,710	296,933
Decrease in restricted cash and cash equivalents	2,530	14,383
Decrease (increase) in restricted short-term investments	81,660	(42,282)
Activity in investment in associated organizations - Purchases	(4,371)	(4,012)
Activity in investment in associated organizations - Proceeds	3,768	2,505
Activity in other long-term investments - Purchases	(824)	(2,367)
Activity in other long-term investments - Proceeds	700	2,700
Other	(3,955)	6,349
Net cash used in investing activities	(850,069)	(360,382)
Cash flows from financing activities:
Long-term debt proceeds	793,999	222,631
Long-term debt payments	(260,981)	(200,197)
Increase in short-term borrowings, net	47,694	127,245
Other	(1,756)	1,930
Net cash provided by financing activities	578,956	151,609
Net decrease in cash and cash equivalents	(254,266)	(216,120)
Cash and cash equivalents at beginning of period	672,212	579,069
Cash and cash equivalents at end of period	417,946	362,949
Cash paid for -
Interest (net of amounts capitalized)	126,758	108,629
Supplemental disclosure of non-cash investing and financing activities:
Change in plant expenditures included in accounts payable	$ 30,335	$ 73,221