Consolidated Statements Of Revenues, Expenses, And Patronage Capital - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Operating Revenues	$ 1,005,917	$ 780,640	$ 807,704
Revenue, Product and Service [Extensible Enumeration]	us-gaap:ElectricityMember	us-gaap:ElectricityMember	us-gaap:ElectricityMember
Operating Expenses:
Fuel	$ 193,599	$ 166,517	$ 144,348
Purchased power	462,526	234,471	250,546
Transmission	151,778	131,290	128,427
Deferred energy	(78,831)	(28,116)	26,660
Operations and maintenance	91,360	78,294	61,518
Administrative and general	42,111	41,372	43,023
Depreciation and amortization	69,167	70,416	69,902
Amortization of regulatory asset/(liability), net	(960)	16,458	9,069
Accretion of asset retirement obligations	5,873	5,664	5,463
Taxes, other than income taxes	8,784	9,171	9,275
Total Operating Expenses	945,407	725,537	748,231
Operating Margin	60,510	55,103	59,473
Other income (expense), net	1,967	409	(105)
Investment income	4,709	20,162	13,106
Interest charges, net	(55,265)	(55,657)	(60,306)
Income taxes (expense)/benefit	(151)	8	(2)
Net Margin including Non-controlling interest	11,770	20,025	12,166
Non-controlling interest	(465)	22	(7)
Net Margin attributable to ODEC	11,305	20,047	12,159
Patronage Capital - Beginning of Period	464,777	453,470	441,311
Patronage Capital - Retirement		(8,740)
Patronage Capital - End of Period	$ 476,082	$ 464,777	$ 453,470