Regulatory Assets And Liabilities (Schedule Of Regulatory Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory assets	$ 22,253	$ 31,131
Regulatory liabilities	220,619	142,724
Deferred Energy [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory Assets included in Current Assets	5,005
Regulatory Liabilities included in Current Liabilities		23,112
North Anna Nuclear Decommissioning Trust Unrealized Gain (Net of Losses) [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities	98,567	84,321
North Anna Asset Retirement Obligation Deferral [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities	72,226	58,231
Unamortized Gains On Reacquired Debt [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities	113	172
Interest Rate Hedge [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory assets	1,604	1,754
Deferred Net Unrealized Losses On Derivative Instruments [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory assets		3,627
Deferred Net Unrealized Gains On Derivative Instruments [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities	49,713
Unamortized Losses On Reacquired Debt [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory assets	2,518	4,382
Deferred Asset Retirement Costs [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory assets	230	246
NOVEC Contract Termination Fee [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory assets	17,128	19,575
Voluntary Prepayment To NRECA Retirement Security Plan [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Regulatory assets	$ 773	$ 1,547