Consolidated Statements of Revenues and Expenses - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating revenues:
Sales to Members	$ 311,148	$ 338,116	$ 619,924	$ 672,875
Sales to non-Members	32,593	17,867	63,595	50,408
Total operating revenues	343,741	355,983	683,519	723,283
Operating expenses:
Fuel	115,211	133,976	223,620	266,252
Production	128,369	99,004	243,128	207,088
Depreciation and amortization	42,952	41,404	85,604	82,118
Purchased power	14,612	16,312	28,243	36,378
Accretion	6,477	6,108	12,859	12,126
Deferral of Hawk Road and Smith Energy Facilities effect on net margin	(27,374)	(10,421)	(41,689)	(20,136)
Total operating expenses	280,247	286,383	551,765	583,826
Operating margin	63,494	69,600	131,754	139,457
Other income:
Investment income	10,185	9,145	20,034	18,427
Amortization of deferred gains	370	447	740	894
Allowance for equity used during construction	168	342	342	731
Other	1,903	1,443	4,218	2,984
Total other income	12,626	11,377	25,334	23,036
Interest charges:
Interest expense	88,132	85,965	175,839	167,882
Allowance for debt funds used during construction	(26,699)	(26,385)	(52,952)	(50,114)
Amortization of debt discount and expense	3,835	4,201	7,980	8,306
Net interest charges	65,268	63,781	130,867	126,074
Net margin	$ 10,852	$ 17,196	$ 26,221	$ 36,419