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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Beginning balance $ 2,306 $ 2,276 $ 4,918
Unrealized gains (losses) 204 (425) (495)
Purchases 4,240 8,089 7,270
Settlements (4,922) (7,634) (9,417)
Ending balance 1,828 2,306 2,276
CLECO POWER      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Beginning balance 2,306 2,276 4,918
Unrealized gains (losses) 204 (425) (495)
Purchases 4,240 8,089 7,270
Settlements (4,922) (7,634) (9,417)
Ending balance $ 1,828 $ 2,306 $ 2,276