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Electric Customer Credits (Details) - USD ($)
$ in Thousands
9 Months Ended 53 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Oct. 31, 2014
Electric Customer Credits [Line Items]          
Provision for rate refund     $ 5,444 $ 2,264  
Cleco Power [Member]          
Electric Customer Credits [Line Items]          
Provision for rate refund     5,444 $ 2,264  
Cleco Power [Member] | FERC [Member] | Transmission ROE [Member]          
Electric Customer Credits [Line Items]          
Provision for rate refund     2,400    
Cleco Power [Member] | LPSC [Member] | 2010 FRP [Member]          
Electric Customer Credits [Line Items]          
Target ROE allowed by FRP (in hundredths)   10.70%      
Percentage of retail earnings within range to be returned to customers (in hundredths)   60.00%      
ROE for customer credit, low range (in hundredths)   11.30%      
ROE for customer credit, high range (in hundredths)   12.30%      
Cleco Power [Member] | LPSC [Member] | FRP extension [Member]          
Electric Customer Credits [Line Items]          
Target ROE allowed by FRP (in hundredths) 10.00%        
Percentage of retail earnings within range to be returned to customers (in hundredths) 60.00%        
ROE for customer credit, low range (in hundredths) 10.90%        
ROE for customer credit, high range (in hundredths) 11.75%        
Cleco Power [Member] | LPSC [Member] | 2014 FRP Monitoring Report [Member]          
Electric Customer Credits [Line Items]          
Provision for rate refund     1,600   $ 1,600
Cleco Power [Member] | LPSC [Member] | Energy Efficiency Programs [Member]          
Electric Customer Credits [Line Items]          
Provision for rate refund     1,100    
Cleco Power [Member] | LPSC [Member] | 2015 FRP Monitoring report [Member]          
Electric Customer Credits [Line Items]          
Provision for rate refund     $ 300    
Maximum [Member] | Cleco Power [Member] | LPSC [Member] | 2010 FRP [Member]          
Electric Customer Credits [Line Items]          
Target ROE allowed by FRP (in hundredths)   11.30%      
Maximum [Member] | Cleco Power [Member] | LPSC [Member] | FRP extension [Member]          
Electric Customer Credits [Line Items]          
Target ROE allowed by FRP (in hundredths) 10.90%