Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Electric plant:
In service	$ 9,790,913	$ 9,394,112
Right-of-use assets—finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,397,418)	(4,968,294)
Net in service	4,696,227	4,728,550
Nuclear fuel, at amortized cost	365,685	358,728
Construction work in progress	6,534,429	5,783,579
Total electric plant	11,596,341	10,870,857
Investments and funds:
Nuclear decommissioning trust fund	635,958	598,181
Investment in associated companies	73,099	74,844
Long-term investments	678,704	518,065
Restricted investments	73,400	306,601
Other	30,441	29,189
Total investments and funds	1,491,602	1,526,880
Current assets:
Cash and cash equivalents	452,943	405,511
Restricted short-term investments	246,580	180,986
Receivables	205,128	152,466
Inventories, at average cost	237,018	280,289
Prepayments and other current assets	94,370	33,839
Total current assets	1,236,039	1,053,091
Deferred charges:
Regulatory assets	898,117	731,438
Prepayments to Georgia Power	34,859	37,601
Other	59,208	20,289
Total deferred charges	992,184	789,328
Total assets	15,316,166	14,240,156
Capitalization:
Patronage capital and membership fees	1,120,652	1,072,642
Long-term debt	10,330,910	10,298,385
Obligation under finance leases	65,207	68,876
Other	27,402	26,861
Total capitalization	11,544,171	11,466,764
Current liabilities:
Long-term debt and finance leases due within one year	263,010	208,649
Short-term borrowings	1,023,374	383,498
Accounts payable	159,712	162,249
Accrued interest	78,276	72,434
Member power bill prepayments, current	26,207	46,068
Other current liabilities	82,285	68,932
Total current liabilities	1,632,864	941,830
Deferred credits and other liabilities:
Asset retirement obligations	1,214,467	1,135,983
Member power bill prepayments, non-current	86,492	98,113
Regulatory liabilities	816,229	566,399
Other	21,943	31,067
Total deferred credits and other liabilities	2,139,131	1,831,562
Total equity and liabilities	$ 15,316,166	$ 14,240,156