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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
Mar. 31, 2024
Mar. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balances, beginning of period $ 2,306 $ 2,276
Unrealized (losses) gains (418) (24)
Purchases (33) (64)
Settlements (1,409) (1,555)
Balances, end of period 446 633
CLECO POWER    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balances, beginning of period 2,306 2,276
Unrealized (losses) gains (418) (24)
Purchases (33) (64)
Settlements (1,409) (1,555)
Balances, end of period $ 446 $ 633