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Fair Value Accounting Instruments - Schedule of Net Changes in Net Fair Value of FTR Assets and Liabilities Classified as Level 3 (Details) - Level 3 - FTRs - FTRs - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balances, beginning of period $ 6,459 $ 10,138 $ 2,276 $ 4,918
Unrealized (losses) gains 114 (1,363) (186) 189
Purchases 12 168 8,035 7,037
Settlements (2,442) (4,205) (5,982) (7,406)
Balances, end of period 4,143 4,738 4,143 4,738
CLECO POWER        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balances, beginning of period 6,459 10,138 2,276 4,918
Unrealized (losses) gains 114 (1,363) (186) 189
Purchases 12 168 8,035 7,037
Settlements (2,442) (4,205) (5,982) (7,406)
Balances, end of period $ 4,143 $ 4,738 $ 4,143 $ 4,738