Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Electric plant:
In service	$ 14,108,427	$ 9,266,627
Right-of-use assets—finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,358,624)	(5,183,589)
Electric plant in service, net	9,052,535	4,385,770
Nuclear fuel, at amortized cost	397,873	388,303
Construction work in progress	3,491,051	7,716,035
Total electric plant	12,941,459	12,490,108
Investments and funds:
Nuclear decommissioning trust fund	576,499	540,716
Investment in associated companies	77,368	78,937
Long-term investments	666,714	669,479
Other	33,991	32,561
Total investments and funds	1,354,572	1,321,693
Current assets:
Cash and cash equivalents	484,237	595,381
Restricted cash and short-term investments	7,100	104,431
Short-term investments	124,919	61,702
Receivables	216,805	220,015
Inventories, at average cost	318,055	297,951
Prepayments and other current assets	28,910	51,409
Total current assets	1,180,026	1,330,889
Deferred charges and other assets:
Regulatory assets	1,188,740	1,212,305
Prepayments to Georgia Power Company	6,027	20,873
Other	76,609	113,502
Total deferred charges	1,271,376	1,346,680
Total assets	16,747,433	16,489,370
Capitalization:
Patronage capital and membership fees	1,262,078	1,192,127
Long-term debt	11,269,483	11,512,513
Obligation under finance leases	48,388	52,937
Obligation under Rocky Mountain transactions	29,375	27,945
Other	1,686	2,256
Total capitalization	12,611,010	12,787,778
Current liabilities:
Long-term debt and finance leases due within one year	407,371	322,102
Short-term borrowings	1,189,600	655,650
Accounts payable	69,427	203,705
Accrued interest	116,257	105,452
Member power bill prepayments, current	38,890	54,443
Other current liabilities	93,612	153,941
Total current liabilities	1,915,157	1,495,293
Deferred credits and other liabilities:
Asset retirement obligations	1,456,610	1,343,743
Member power bill prepayments, non-current	43,183	53,877
Regulatory liabilities	705,073	792,190
Other	16,400	16,489
Total deferred credits and other liabilities	2,221,266	2,206,299
Total equity and liabilities	$ 16,747,433	$ 16,489,370