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Long-term debt (Details) - USD ($)
$ in Thousands
12 Months Ended
May. 05, 2014
May. 02, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
[1]
Long-term debt          
Long-term debt     $ 1,506,546 $ 1,492,945  
Aggregate principal payments          
2015     0    
2016     200,000    
2017     0    
2018     50,000    
2019     0    
Proceeds from issuance of long-term debt     125,000 286,000 [1] $ 457,000
Hawaiian Electric Company, Inc. and Subsidiaries          
Aggregate principal payments          
2015     0    
2016     0    
2017     0    
2018     50,000    
2019     0    
Proceeds from issuance of long-term debt     0 236,000 [1] $ 457,000
Special purpose revenue bonds issued on behalf of electric utility subsidiaries          
Long-term debt          
Long-term debt     1,206,546 1,217,945  
HEI term loan LIBOR plus .90% due 2016          
Long-term debt          
Long-term debt     $ 125,000 0  
HEI term loan LIBOR plus .90% due 2016 | LIBOR          
Long-term debt          
Line of credit facility basis point spread (as a percent)     0.90%    
HEI medium-term note 6.51%, due 2014          
Long-term debt          
Long-term debt     $ 0 $ 100,000  
Debt instrument, stated interest rate (as a percent)     6.51% 6.51%  
HEI medium-term note 6.51%, due 2014 | Medium-term note          
Long-term debt          
Debt instrument, stated interest rate (as a percent) 6.51%        
Aggregate principal payments          
Refinancing of unsecured debt payable $ 100,000        
HEI senior note 4.41%, due 2016          
Long-term debt          
Long-term debt     $ 75,000 $ 75,000  
Debt instrument, stated interest rate (as a percent)     4.41% 4.41%  
HEI senior note 5.67%, due 2021          
Long-term debt          
Long-term debt     $ 50,000 $ 50,000  
Debt instrument, stated interest rate (as a percent)     5.67% 5.67%  
HEI senior note 3.99%, due 2023          
Long-term debt          
Long-term debt     $ 50,000 $ 50,000  
Debt instrument, stated interest rate (as a percent)     3.99% 3.99%  
Loans payable | Eurodollar term loan          
Aggregate principal payments          
Proceeds from issuance of long-term debt   $ 125,000      
Term Of Loan   2 years      
Loans payable | Eurodollar term loan | Minimum          
Aggregate principal payments          
Debt Instrument, Interest Rate, Effective Percentage   1.12%      
Loans payable | Eurodollar term loan | Maximum          
Aggregate principal payments          
Debt Instrument, Interest Rate, Effective Percentage   1.14%      
[1] As restated - See Note 1, “Summary of significant accounting policies - Revision and restatements of previously issued financial statements.”