Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net margin	$ 13,520	$ 16,110
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization, including nuclear fuel	77,580	63,304
Accretion cost	4,857	4,560
Amortization of deferred gains	(1,415)	(1,415)
Allowance for equity funds used during construction	(851)	(547)
Deferred outage costs	(12,604)	(23,569)
Deferral of Hawk Road and Murray Energy facilities effect on net margin	(12,075)	(8,319)
Gain on sale of investments	(2,362)	(5,053)
Regulatory deferral of costs associated with nuclear decommissioning	(622)	2,348
Other	(1,923)	(1,848)
Change in operating assets and liabilities:
Receivables	(12,349)	8,653
Inventories	511	(15,570)
Prepayments and other current assets	1,525	1,038
Accounts payable	(25,594)	(7,541)
Accrued interest	(21,844)	(30,225)
Accrued taxes	(12,704)	(16,838)
Other current liabilities	1,227	6,017
Member power bill prepayments	5,570	(14,174)
Total adjustments	(13,073)	(39,179)
Net cash provided by (used in) operating activities	447	(23,069)
Cash flows from investing activities:
Property additions	(210,050)	(208,479)
Activity in decommissioning fund - Purchases	(288,010)	(284,469)
Activity in decommissioning fund - Proceeds	287,040	283,188
Increase in restricted cash and cash equivalents	(8,671)	(168,701)
(Increase) decrease in restricted short-term investments	(3,850)	82,162
Decrease (increase) in investment in associated organizations	202	(256)
Activity in other long-term investments - Purchases	(486)	(402)
Activity in other long-term investments - Proceeds	8,600	300
Activity on interest rate options - Purchases	0
Activity on interest rate options - Collateral received	8,670
Other	12,623	(1,185)
Net cash used in investing activities	(193,932)	(297,842)
Cash flows from financing activities:
Long-term debt proceeds	69,139	257,351
Long-term debt payments	(42,907)	(54,931)
Increase (decrease) in short-term borrowings, net	123,921	(12,719)
Other	2,029	(138)
Net cash provided by financing activities	152,182	189,563
Net decrease in cash and cash equivalents	(41,303)	(131,348)
Cash and cash equivalents at beginning of period	443,671	672,212
Cash and cash equivalents at end of period	402,368	540,864
Cash paid for -
Interest (net of amounts capitalized)	74,287	82,661
Supplemental disclosure of non-cash investing and financing activities:
Change in plant expenditures included in accounts payable	$ (27,699)	$ 29,663