Summary of Significant Accounting Policies - Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Restricted Cash and Cash Equivalents [Abstract]
Current	$ 15,918	$ 15,818
Restricted cash - noncurrent	116,493	113,573
Total restricted cash and cash equivalents	132,411	129,391
Cleco Securitization I operating expenses and storm recovery bond issuance costs and debt service
Restricted Cash and Cash Equivalents [Abstract]
Current	15,918	15,818
Cleco Securitization II operating expenses
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent	1	0
Diversified Lands’ mitigation escrow
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent	24	24
Cleco Power’s future storm restoration costs
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent	116,468	113,549
CLECO POWER
Restricted Cash and Cash Equivalents [Abstract]
Current	15,918	15,818
Restricted cash - noncurrent	116,469	113,549
Total restricted cash and cash equivalents	132,387	129,367
CLECO POWER | Cleco Securitization I operating expenses and storm recovery bond issuance costs and debt service
Restricted Cash and Cash Equivalents [Abstract]
Current	15,918	15,818
CLECO POWER | Cleco Securitization II operating expenses
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent	1	0
CLECO POWER | Cleco Power’s future storm restoration costs
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent	$ 116,468	$ 113,549