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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balances, beginning of period $ 450 $ 446 $ 1,828 $ 2,306
Unrealized gains (losses) 55 (154) 55 (154)
Purchases 6,487 4,282 6,489 4,249
Settlements (1,206) (1,026) (2,586) (2,853)
Balances, end of period 5,786 3,548 5,786 3,548
CLECO POWER        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balances, beginning of period 450 446 1,828 2,306
Unrealized gains (losses) 55 (154) 55 (154)
Purchases 6,487 4,282 6,489 4,249
Settlements (1,206) (1,026) (2,586) (2,853)
Balances, end of period $ 5,786 $ 3,548 $ 5,786 $ 3,548