Consolidated Statements of Revenues and Expenses (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating revenues:
Total operating revenues	$ 564,090	$ 389,389	$ 1,100,404	$ 778,842
Operating expenses:
Fuel	148,463	132,468	315,509	265,636
Production	148,919	99,412	267,009	192,879
Depreciation and amortization	103,949	73,015	198,054	145,689
Purchased power	19,202	17,785	38,422	35,415
Accretion	18,417	16,722	36,039	32,230
Total operating expenses	438,950	339,402	855,033	671,849
Operating margin	125,140	49,987	245,371	106,993
Other income:
Investment income	15,900	17,943	32,952	34,325
Other	2,943	2,909	5,747	5,834
Total other income	18,843	20,852	38,699	40,159
Interest charges:
Interest expense	129,720	128,384	259,111	252,091
Allowance for debt funds used during construction	(12,722)	(78,591)	(46,829)	(153,021)
Amortization of debt discount and expense	2,794	2,632	5,498	5,258
Net interest charges	119,792	52,425	217,780	104,328
Net margin	24,191	18,414	66,290	42,824
Sales to members
Operating revenues:
Total operating revenues	562,267	365,496	1,097,637	753,149
Sales to non-members
Operating revenues:
Total operating revenues	$ 1,823	$ 23,893	$ 2,767	$ 25,693