Summary of Significant Accounting Policies - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jun. 01, 2024
Accounting Policies [Line Items]
Receivable, threshold period past due	21 days
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 3,012	$ 1,147
Current period provision	2,048	5,506
Charge-offs	(4,815)	(4,939)
Recovery	1,092	1,298
Ending balance	1,337	3,012
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,638	1,638
Current period provision	0	0
Charge-offs	0	0
Recovery	0	0
Ending balance	1,638	1,638
Receivable, Allowance For Credit Loss [Roll Forward]
Beginning balance	4,650	2,785
Current period provision	2,048	5,506
Charge-offs	(4,815)	(4,939)
Recovery	1,092	1,298
Ending balance	2,975	4,650
Discontinued Operations, Held-for-sale | Cleco Cajun
Receivable, Allowance For Credit Loss [Roll Forward]
Consideration receivable			$ 113,000
Cleco Power
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,012	1,147
Current period provision	2,048	5,506
Charge-offs	(4,815)	(4,939)
Recovery	1,092	1,298
Ending balance	$ 1,337	$ 3,012