Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenues
Other	$ 12,371	$ 21,329	$ 24,671	$ 42,185
Operating revenues	327,513	338,901	646,021	677,330
Operating expenses
Purchased power	81,563	82,356	165,021	158,775
Fuel	48,301	58,508	100,241	119,321
Production	62,397	61,088	113,192	110,649
Transmission	41,900	40,486	81,964	74,286
General and administrative	8,797	4,841	16,525	12,021
Depreciation, amortization and depletion	39,555	41,090	79,643	87,762
Coal mining		9,584		17,760
Other	3,284	3,978	7,420	8,768
Operating expenses	285,797	301,931	564,006	589,342
Operating margins	41,716	36,970	82,015	87,988
Other income (expense)
Interest	1,236	1,135	2,439	2,220
Capital credits from cooperatives	145	151	4,200	4,397
Membership withdrawal		2,500		5,000
Other, net	939	409	2,143	1,429
Total other income	2,320	4,195	8,782	13,046
Interest expense, net of amounts capitalized	38,982	36,299	77,003	72,648
Income tax benefit	(151)	(302)	(302)	(604)
Net margins including noncontrolling interest	5,205	5,168	14,096	28,990
Net income attributable to noncontrolling interest	(827)	(377)	(1,624)	(673)
Net margins attributable to the Association	4,378	4,791	12,472	28,317
Member electric sales
Operating revenues
Operating revenues	300,083	292,259	589,429	574,674
Non-member electric sales
Operating revenues
Operating revenues	$ 15,059	$ 25,313	$ 31,921	$ 60,471