Consolidated Statements of Revenues and Expenses (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating revenues:
Total operating revenues	$ 533,128	$ 358,127	$ 953,570	$ 734,458
Operating expenses:
Fuel	263,121	113,531	428,605	221,596
Production	113,387	93,477	209,167	198,850
Depreciation and amortization	70,830	67,277	141,756	134,896
Purchased power	17,661	16,866	34,536	33,786
Accretion	13,860	13,941	27,392	27,722
Total operating expenses	478,859	305,092	841,456	616,850
Operating margin	54,269	53,035	112,114	117,608
Other income:
Investment income	12,825	12,130	24,672	24,090
Other	3,095	277	6,125	2,448
Total other income	15,920	12,407	30,797	26,538
Interest charges:
Interest expense	111,595	104,247	216,264	207,726
Allowance for debt funds used during construction	(62,497)	(54,810)	(119,270)	(108,449)
Amortization of debt discount and expense	2,924	2,860	5,770	5,766
Net interest charges	52,022	52,297	102,764	105,043
Net margin	18,167	13,145	40,147	39,103
Members
Operating revenues:
Total operating revenues	478,782	357,921	896,231	734,193
Non-Members
Operating revenues:
Total operating revenues	$ 54,346	$ 206	$ 57,339	$ 265