Consolidated Statements of Revenues and Expenses (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating revenues:
Total operating revenues	$ 631,461	$ 540,670	$ 1,942,785	$ 1,641,074
Operating expenses:
Fuel	224,759	152,582	654,244	468,091
Production	137,928	116,060	426,212	383,069
Depreciation and amortization	108,992	108,024	322,590	306,078
Purchased power	22,124	19,833	65,964	58,255
Accretion	14,728	18,626	43,867	54,665
Total operating expenses	508,531	415,125	1,512,877	1,270,158
Operating margin	122,930	125,545	429,908	370,916
Other income:
Investment income	8,056	15,018	24,600	47,970
Other	2,736	1,620	6,787	7,367
Total other income	10,792	16,638	31,387	55,337
Interest charges:
Interest expense	134,715	131,025	402,686	390,136
Allowance for debt funds used during construction	(5,398)	(2,259)	(14,117)	(49,088)
Amortization of debt discount and expense	2,527	2,857	7,547	8,355
Net interest charges	131,844	131,623	396,116	349,403
Net margin	1,878	10,560	65,179	76,850
Sales to members
Operating revenues:
Total operating revenues	594,248	515,497	1,864,239	1,613,134
Sales to non-members
Operating revenues:
Total operating revenues	$ 37,213	$ 25,173	$ 78,546	$ 27,940