Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Electric plant:
In service	$ 9,397,950	$ 9,394,112
Right-of-use assets—finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,055,337)	(4,968,294)
Net in service	4,645,345	4,728,550
Nuclear fuel, at amortized cost	361,576	358,728
Construction work in progress	6,049,746	5,783,579
Total electric plant	11,056,667	10,870,857
Investments and funds:
Nuclear decommissioning trust fund	608,747	598,181
Investment in associated companies	74,094	74,844
Long-term investments	565,662	518,065
Restricted investments	188,857	306,601
Other	29,602	29,189
Total investments and funds	1,466,962	1,526,880
Current assets:
Cash and cash equivalents	561,101	405,511
Restricted short-term investments	244,450	180,986
Receivables	153,542	152,466
Inventories, at average cost	271,769	280,289
Prepayments and other current assets	30,867	33,839
Total current assets	1,261,729	1,053,091
Deferred charges:
Regulatory assets	760,599	731,438
Prepayments to Georgia Power	37,717	37,601
Other	20,912	20,289
Total deferred charges	819,228	789,328
Total assets	14,604,586	14,240,156
Capitalization:
Patronage capital and membership fees	1,098,600	1,072,642
Long-term debt	10,434,701	10,298,385
Obligation under finance leases	68,876	68,876
Other	26,985	26,861
Total capitalization	11,629,162	11,466,764
Current liabilities:
Long-term debt and finance leases due within one year	250,110	208,649
Short-term borrowings	601,172	383,498
Accounts payable	104,427	162,249
Accrued interest	76,734	72,434
Member power bill prepayments, current	34,907	46,068
Other current liabilities	40,093	68,932
Total current liabilities	1,107,443	941,830
Deferred credits and other liabilities:
Asset retirement obligations	1,147,853	1,135,983
Member power bill prepayments, non-current	90,495	98,113
Regulatory liabilities	604,032	566,399
Other	25,601	31,067
Total deferred credits and other liabilities	1,867,981	1,831,562
Total equity and liabilities	$ 14,604,586	$ 14,240,156