Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Electric plant:
In service	$ 9,389,367	$ 9,266,627
Right-of-use assets—finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,230,497)	(5,183,589)
Electric plant in service, net	4,461,602	4,385,770
Nuclear fuel, at amortized cost	392,621	388,303
Construction work in progress	7,885,910	7,716,035
Total electric plant	12,740,133	12,490,108
Investments and funds:
Nuclear decommissioning trust fund	574,121	540,716
Investment in associated companies	77,750	78,937
Long-term investments	666,010	669,479
Other	33,032	32,561
Total investments and funds	1,350,913	1,321,693
Current assets:
Cash and cash equivalents	390,821	595,381
Restricted cash and short-term investments	16,000	104,431
Short-term investments	76,064	61,702
Receivables	163,909	220,015
Inventories, at average cost	315,715	297,951
Prepayments and other current assets	16,064	51,409
Total current assets	978,573	1,330,889
Deferred charges and other assets:
Regulatory assets	1,214,977	1,212,305
Prepayments to Georgia Power Company	13,441	20,873
Other	81,153	113,502
Total deferred charges	1,309,571	1,346,680
Total assets	16,379,190	16,489,370
Capitalization:
Patronage capital and membership fees	1,216,537	1,192,127
Long-term debt	11,392,980	11,512,513
Obligation under finance leases	52,937	52,937
Obligation under Rocky Mountain transactions	28,416	27,945
Other	1,961	2,256
Total capitalization	12,692,831	12,787,778
Current liabilities:
Long-term debt and finance leases due within one year	320,331	322,102
Short-term borrowings	813,025	655,650
Accounts payable	82,251	203,705
Accrued interest	92,343	105,452
Member power bill prepayments, current	49,154	54,443
Other current liabilities	92,073	153,941
Total current liabilities	1,449,177	1,495,293
Deferred credits and other liabilities:
Asset retirement obligations	1,444,558	1,343,743
Member power bill prepayments, non-current	58,177	53,877
Regulatory liabilities	718,276	792,190
Other	16,171	16,489
Total deferred credits and other liabilities	2,237,182	2,206,299
Total equity and liabilities	$ 16,379,190	$ 16,489,370