Fair Value Accounting Instruments - Fair Value of Financial Assets and Liabilities Measured On A Recurring Basis (Details) - Measured On A Recurring Basis - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Asset Description
Short-term investments	$ 153,972	$ 242,596
Total assets	165,266	250,725
Liability Description
Total liabilities	256	15,786
CLECO POWER
Asset Description
Short-term investments	147,648	169,606
Total assets	158,942	172,693
Liability Description
Total liabilities	256	15,112
FTRs
Asset Description
Derivative assets	2,084	3,087
Liability Description
Derivative liabilities	256	781
FTRs | CLECO POWER
Asset Description
Derivative assets	2,084	3,087
Liability Description
Derivative liabilities	256	781
Natural gas derivatives
Asset Description
Derivative assets	9,210	5,042
Liability Description
Derivative liabilities	0	15,005
Natural gas derivatives | CLECO POWER
Asset Description
Derivative assets	9,210	0
Liability Description
Derivative liabilities	0	14,331
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)
Asset Description
Short-term investments	153,972	242,596
Total assets	153,972	242,596
Liability Description
Total liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | CLECO POWER
Asset Description
Short-term investments	147,648	169,606
Total assets	147,648	169,606
Liability Description
Total liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | FTRs
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | FTRs | CLECO POWER
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | Natural gas derivatives
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | Natural gas derivatives | CLECO POWER
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Asset Description
Short-term investments	0	0
Total assets	9,210	5,042
Liability Description
Total liabilities	0	15,005
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER
Asset Description
Short-term investments	0	0
Total assets	9,210	0
Liability Description
Total liabilities	0	14,331
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | FTRs
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | FTRs | CLECO POWER
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Natural gas derivatives
Asset Description
Derivative assets	9,210	5,042
Liability Description
Derivative liabilities	0	15,005
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Natural gas derivatives | CLECO POWER
Asset Description
Derivative assets	9,210	0
Liability Description
Derivative liabilities	0	14,331
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Asset Description
Short-term investments	0	0
Total assets	2,084	3,087
Liability Description
Total liabilities	256	781
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER
Asset Description
Short-term investments	0	0
Total assets	2,084	3,087
Liability Description
Total liabilities	256	781
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs
Asset Description
Derivative assets	2,084	3,087
Liability Description
Derivative liabilities	256	781
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs | CLECO POWER
Asset Description
Derivative assets	2,084	3,087
Liability Description
Derivative liabilities	256	781
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Natural gas derivatives
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Natural gas derivatives | CLECO POWER
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	$ 0	$ 0