CONSOLIDATED STATEMENTS OF REVENUES AND EXPENSES (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating revenues:
Sales to Members	$ 1,224,238	$ 1,292,667	$ 1,144,012
Sales to non-Members	166,040	1,478	1,249
Total operating revenues	1,390,278	1,294,145	1,145,261
Operating expenses:
Fuel	527,191	481,379	360,412
Production	357,069	332,236	285,654
Depreciation and amortization	199,040	131,491	125,600
Purchased power	60,590	78,810	123,105
Accretion	18,249	17,131	18,261
Deferral of Hawk Road and Murray Energy facilities effect on net margin	(9,681)	13,849	8,107
Total operating expenses	1,152,458	1,054,896	921,139
Operating margin	237,820	239,249	224,122
Other income:
Investment income	29,496	30,208	31,825
Amortization of deferred gains	5,660	5,660	5,660
Allowance for equity funds used during construction	2,904	2,417	2,394
Other	6,204	5,366	2,849
Total other income	44,264	43,651	42,728
Interest charges:
Interest expense	296,138	266,641	240,743
Allowance for debt funds used during construction	(72,692)	(41,593)	(19,345)
Amortization of debt discount and expense	20,901	24,119	19,062
Net interest charges	244,347	249,167	240,460
Net margin	$ 37,737	$ 33,733	$ 26,390