Condensed Statements of Revenues and Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating revenues:
Sales to Members	$ 295,230	$ 269,448
Sales to non-Members	23,994	326
Total operating revenues	319,224	269,774
Operating expenses:
Fuel	106,820	72,449
Production	98,499	89,189
Depreciation and amortization	44,544	34,405
Purchased power	14,523	11,555
Accretion	4,857	4,560
Deferral of Hawk Road and Murray Energy Facilities effect on net margin	(12,075)	(8,319)
Total operating expenses	257,168	203,839
Operating margin	62,056	65,935
Other income:
Investment income	8,255	7,394
Other	3,743	3,366
Total other income	11,998	10,760
Interest charges:
Interest expense	76,007	70,666
Allowance for debt funds used during construction	(20,419)	(15,228)
Amortization of debt discount and expense	4,946	5,147
Net interest charges	60,534	60,585
Net margin	$ 13,520	$ 16,110