CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Electric plant:
In service	$ 9,865,660	$ 9,394,112
Right-of-use assets--finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,565,724)	(4,968,294)
Net in service	4,602,668	4,728,550
Nuclear fuel, at amortized cost	375,267	358,728
Construction work in progress	6,779,392	5,783,579
Total electric plant	11,757,327	10,870,857
Investments and funds:
Nuclear decommissioning trust fund	659,910	598,181
Investment in associated companies	75,826	74,844
Long-term investments	711,379	518,065
Restricted investments	73,702	306,601
Other	31,991	29,189
Total investments and funds	1,552,808	1,526,880
Current assets:
Cash and cash equivalents	579,350	405,511
Restricted short-term investments	246,350	180,986
Receivables	159,538	152,466
Inventories, at average cost	260,526	280,289
Prepayments and other current assets	62,286	33,839
Total current assets	1,308,050	1,053,091
Deferred charges and other assets:
Regulatory assets	1,008,790	731,438
Prepayments to Georgia Power Company	27,124	37,601
Other	52,927	20,289
Total deferred charges	1,088,841	789,328
Total assets	15,707,026	14,240,156
Capitalization:
Patronage capital and membership fees	1,130,423	1,072,642
Long-term debt	10,529,449	10,298,385
Obligations under finance leases	61,335	68,876
Other	27,701	26,861
Total capitalization	11,748,908	11,466,764
Current liabilities:
Long-term debt and finance leases due within one year	281,238	208,649
Short-term borrowings	1,095,971	383,498
Accounts payable	182,164	162,249
Accrued interest	96,410	72,434
Member power bill prepayments, current	26,102	46,068
Other current liabilities	36,123	68,932
Total current liabilities	1,718,008	941,830
Deferred credits and other liabilities:
Asset retirement obligations	1,287,143	1,135,983
Member power bill prepayments, non-current	80,001	98,113
Regulatory liabilities	849,449	566,399
Other	23,517	31,067
Total deferred credits and other liabilities	2,240,110	1,831,562
Total equity and liabilities	15,707,026	14,240,156
Commitments and Contingencies (Notes 1, 7, 10, 11 and 12)