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Fair Value Accounting Instruments - Net Changes in Net Fair Value of FTR Assets and Liabilities Classified as Level 3 (Details) - FTRs - FTRs - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Beginning balance $ 2,276 $ 4,918 $ 3,216
Unrealized (losses) gains (425) (495) 2,828
Purchases 8,089 7,270 9,871
Settlements (7,634) (9,417) (10,997)
Ending balance 2,306 2,276 4,918
CLECO POWER      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Beginning balance 2,276 4,918 3,216
Unrealized (losses) gains (425) (495) 2,828
Purchases 8,089 7,270 9,871
Settlements (7,634) (9,417) (10,997)
Ending balance $ 2,306 $ 2,276 $ 4,918