Consolidated Statements of Revenues and Expenses (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating revenues:
Total operating revenues	$ 389,453	$ 420,442
Operating expenses:
Fuel	133,168	165,484
Production	93,467	95,780
Depreciation and amortization	72,674	70,926
Purchased power	17,630	16,875
Accretion	15,508	13,532
Total operating expenses	332,447	362,597
Operating margin	57,006	57,845
Other income:
Investment income	16,382	11,847
Other	2,925	3,030
Total other income	19,307	14,877
Interest charges:
Interest expense	123,707	104,669
Allowance for debt funds used during construction	(74,430)	(56,773)
Amortization of debt discount and expense	2,626	2,846
Net interest charges	51,903	50,742
Net margin	24,410	21,980
Members
Operating revenues:
Total operating revenues	387,653	417,449
Non-Members
Operating revenues:
Total operating revenues	$ 1,800	$ 2,993