Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Electric plant:
In service	$ 17,437,631	$ 17,388,476
Right-of-use assets—finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,868,641)	(5,701,627)
Electric plant in service, net	11,871,722	11,989,581
Nuclear fuel, at amortized cost	411,032	402,328
Construction work in progress	726,542	320,167
Total electric plant	13,009,296	12,712,076
Investments and funds:
Nuclear decommissioning trust fund	832,847	721,624
Investment in associated companies	85,486	86,720
Long-term investments	645,033	645,166
Other	40,494	38,862
Total investments and funds	1,603,860	1,492,372
Current assets:
Cash and cash equivalents	310,678	337,813
Restricted cash and short-term investments	500	500
Short-term investments	85,582	124,572
Receivables	230,736	246,581
Inventories, at weighted average cost	349,625	356,285
Prepayments and other current assets	48,292	44,218
Total current assets	1,025,413	1,109,969
Deferred charges and other assets:
Regulatory assets	1,069,926	1,103,633
Prepayments to Georgia Power Company	17,146	16,334
Other	35,378	43,154
Total deferred charges	1,122,450	1,163,121
Total assets	16,761,019	16,477,538
Capitalization:
Patronage capital and membership fees	1,393,597	1,328,418
Long-term debt	12,084,244	12,134,194
Obligation under finance leases	27,531	33,173
Obligation under Rocky Mountain transactions	33,543	31,910
Other	4,349	5,715
Total capitalization	13,543,264	13,533,410
Current liabilities:
Long-term debt and finance leases due within one year	391,841	398,979
Short-term borrowings	251,119	145,604
Accounts payable	154,475	138,537
Accrued interest	107,046	81,425
Member power bill prepayments, current	25,838	31,258
Other current liabilities	250,131	140,611
Total current liabilities	1,180,450	936,414
Deferred credits and other liabilities:
Asset retirement obligations	1,294,128	1,279,121
Member power bill prepayments, non-current	42,259	54,183
Regulatory liabilities	689,206	661,592
Other	11,712	12,818
Total deferred credits and other liabilities	2,037,305	2,007,714
Total equity and liabilities	$ 16,761,019	$ 16,477,538