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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balances, beginning of period $ 5,786 $ 3,548 $ 1,828 $ 2,306
Unrealized losses (163) (156) (52) (108)
Purchases 0 (7) 6,488 4,242
Settlements (1,605) (1,001) (4,246) (4,056)
Balances, end of period 4,018 2,384 4,018 2,384
CLECO POWER        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balances, beginning of period 5,786 3,548 1,828 2,306
Unrealized losses (163) (156) (52) (108)
Purchases 0 (7) 6,488 4,242
Settlements (1,605) (1,001) (4,246) (4,056)
Balances, end of period $ 4,018 $ 2,384 $ 4,018 $ 2,384