Condensed Statements of Revenues and Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating revenues:
Sales to Members	$ 338,740	$ 315,646	$ 1,011,615	$ 908,490
Sales to non-Members	30,665	34,079	81,073	71,498
Total operating revenues	369,405	349,725	1,092,688	979,988
Operating expenses:
Fuel	147,314	138,252	413,566	351,467
Production	95,570	88,689	302,658	272,703
Depreciation and amortization	41,784	40,779	123,902	116,440
Purchased power	15,603	12,989	51,981	40,373
Accretion	6,198	5,755	18,324	17,062
Deferral of Hawk Road and Smith Energy Facilities effect on net margin	(7,749)	(7,005)	(27,885)	(25,672)
Total operating expenses	298,720	279,459	882,546	772,373
Operating margin	70,685	70,266	210,142	207,615
Other income:
Investment income	8,494	8,353	26,921	23,778
Other	1,956	2,317	6,565	6,834
Total other income	10,450	10,670	33,486	30,612
Interest charges:
Interest expense	88,395	80,569	256,277	232,597
Allowance for debt funds used during construction	(25,921)	(23,597)	(76,035)	(73,013)
Amortization of debt discount and expense	4,208	3,860	12,514	12,013
Net interest charges	66,682	60,832	192,756	171,597
Net margin	$ 14,453	$ 20,104	$ 50,872	$ 66,630