Consolidated Statements of Revenues and Expenses (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating revenues:
Total operating revenues	$ 704,265	$ 460,822	$ 1,657,835	$ 1,195,280
Operating expenses:
Fuel	419,218	214,681	847,823	436,277
Production	114,167	99,321	323,334	298,171
Depreciation and amortization	70,926	69,758	212,682	204,654
Purchased power	21,383	16,920	55,919	50,706
Accretion	14,018	14,117	41,410	41,839
Total operating expenses	639,712	414,797	1,481,168	1,031,647
Operating margin	64,553	46,025	176,667	163,633
Other income:
Investment income	15,090	12,299	39,762	36,389
Other	3,385	2,516	9,510	4,964
Total other income	18,475	14,815	49,272	41,353
Interest charges:
Interest expense	117,018	105,201	333,282	312,927
Allowance for debt funds used during construction	(69,031)	(56,179)	(188,301)	(164,628)
Amortization of debt discount and expense	2,944	2,911	8,714	8,677
Net interest charges	50,931	51,933	153,695	156,976
Net margin	32,097	8,907	72,244	48,010
Members
Operating revenues:
Total operating revenues	627,130	437,240	1,523,361	1,171,433
Non-Members
Operating revenues:
Total operating revenues	$ 77,135	$ 23,582	$ 134,474	$ 23,847