Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Electric plant:
In service	$ 14,202,485	$ 14,112,098
Right-of-use assets—finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,487,672)	(5,418,738)
Electric plant in service, net	9,017,545	8,996,092
Nuclear fuel, at amortized cost	395,866	389,662
Construction work in progress	3,397,847	3,294,641
Total electric plant	12,811,258	12,680,395
Investments and funds:
Nuclear decommissioning trust fund	679,298	641,239
Investment in associated companies	83,794	82,133
Long-term investments	709,815	690,732
Other	36,088	35,585
Total investments and funds	1,508,995	1,449,689
Current assets:
Cash and cash equivalents	327,470	490,592
Short-term investments	135,341	143,931
Receivables	180,414	201,784
Inventories, at weighted average cost	329,414	337,045
Prepayments and other current assets	48,905	18,335
Total current assets	1,021,544	1,191,687
Deferred charges and other assets:
Regulatory assets	1,136,248	1,131,489
Prepayments to Georgia Power Company	14,871	13,722
Other	55,699	57,869
Total deferred charges	1,206,818	1,203,080
Total assets	16,548,615	16,524,851
Capitalization:
Patronage capital and membership fees	1,300,016	1,257,917
Long-term debt	11,474,583	11,600,917
Obligation under finance leases	43,586	43,586
Obligation under Rocky Mountain transactions	30,365	29,862
Other	4,786	5,152
Total capitalization	12,853,336	12,937,434
Current liabilities:
Long-term debt and finance leases due within one year	381,602	384,426
Short-term borrowings	662,779	607,885
Accounts payable	63,328	117,272
Accrued interest	121,073	106,355
Member power bill prepayments, current	25,842	31,406
Other current liabilities	113,493	111,109
Total current liabilities	1,368,117	1,358,453
Deferred credits and other liabilities:
Asset retirement obligations	1,537,803	1,458,937
Member power bill prepayments, non-current	70,033	47,133
Regulatory liabilities	704,084	706,320
Other	15,242	16,574
Total deferred credits and other liabilities	2,327,162	2,228,964
Total equity and liabilities	$ 16,548,615	$ 16,524,851