Condensed Consolidated Statements Of Revenues, Expenses, And Patronage Capital (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Operating Revenues	$ 217,434	$ 191,117
Type of Revenue [Extensible List]	us-gaap:ElectricityMember	us-gaap:ElectricityMember
Operating Expenses:
Fuel	$ 33,021	$ 39,754
Purchased power	126,363	70,992
Transmission	34,284	31,626
Deferred energy	(41,871)	(15,940)
Operations and maintenance	18,609	16,436
Administrative and general	10,728	10,880
Depreciation and amortization	17,287	17,676
Amortization of regulatory asset/(liability), net	(200)	2,487
Accretion of asset retirement obligations	1,467	1,415
Taxes, other than income taxes	2,308	2,425
Total Operating Expenses	201,996	177,751
Operating Margin	15,438	13,366
Other income (expense), net	(51)	71
Investment income	759	3,406
Interest charges, net	(13,409)	(14,010)
Income taxes	1	2
Net Margin including Non-controlling interest	2,738	2,835
Non-controlling interest	2	5
Net Margin attributable to ODEC	2,740	2,840
Patronage Capital - Beginning of Period	464,777	453,470
Patronage Capital - End of Period	$ 467,517	$ 456,310