Fair Value Accounting Instruments - Money Market Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 21,562	$ 113,207
Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	15,263	40,240
Current restricted cash and cash equivalents
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	15,918	15,818
Current restricted cash and cash equivalents | Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	15,918	15,818
Non-current restricted cash and cash equivalents
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	116,492	113,571
Non-current restricted cash and cash equivalents | Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	$ 116,467	$ 113,548