Consolidated Statements of Financial Position - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Electric plant
In service	$ 5,722,679	$ 5,659,423
Construction work in progress	163,954	81,555
Total electric plant	5,886,633	5,740,978
Less allowances for depreciation and amortization	(2,739,924)	(2,392,363)
Net electric plant	3,146,709	3,348,615
Other plant	952,318	954,144
Less allowances for depreciation, amortization and depletion	(711,896)	(694,774)
Net other plant	240,422	259,370
Total property, plant and equipment	3,387,131	3,607,985
Other assets and investments
Investments in other associations	187,684	177,477
Investments in and advances to coal mines	1,619	1,914
Restricted cash and investments	3,408	4,257
Other noncurrent assets	15,264	15,828
Total other assets and investments	207,975	199,476
Current assets
Cash and cash equivalents	106,005	105,852
Restricted cash and investments	605	573
Deposits and advances	37,455	34,233
Accounts receivable—Utility Members	101,394	103,246
Other accounts receivable	23,123	32,436
Coal inventory	54,979	34,723
Materials and supplies	106,893	93,514
Total current assets	430,454	404,577
Deferred charges
Regulatory assets	919,483	650,421
Prepayment—NRECA Retirement Security Plan	5,372	10,745
Other	36,121	40,445
Total deferred charges	960,976	701,611
Total assets	4,986,536	4,913,649
Capitalization
Patronage capital equity	984,581	984,865
Accumulated other comprehensive loss	(839)	(468)
Noncontrolling interest	134,269	126,180
Total equity	1,118,011	1,110,577
Long-term debt	2,896,506	2,869,963
Total capitalization	4,014,517	3,980,540
Current liabilities
Utility Member advances	14,333	17,070
Accounts payable	123,674	109,109
Short-term borrowings	184,305	274,102
Accrued expenses	39,268	42,506
Current asset retirement obligations	21,635	5,419
Accrued interest	24,549	25,431
Accrued property taxes	31,986	36,477
Current maturities of long-term debt	223,523	92,920
Total current liabilities	663,273	603,034
Deferred credits and other liabilities
Regulatory liabilities	2,317	49,931
Deferred income tax liability	15,223	19,275
Asset retirement and environmental reclamation obligations	195,566	181,588
Other	84,125	68,374
Total deferred credits and other liabilities	297,231	319,168
Accumulated postretirement benefit and postemployment obligations	11,515	10,907
Total equity and liabilities	$ 4,986,536	$ 4,913,649