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Long-term debt (Details) - USD ($)
12 Months Ended
Mar. 23, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 15, 2016
Mar. 24, 2016
Mar. 21, 2016
Long-term debt              
Less unamortized debt issuance costs   $ (241,000) $ (334,000)        
Long-term debt   1,619,019,000 1,578,368,000        
Aggregate principal payments              
2017   125,000,000          
2018   125,000,000          
2019   0          
2020   96,000,000          
2021   50,000,000          
Proceeds from issuance of long-term debt   115,000,000 80,000,000 $ 125,000,000      
Hawaiian Electric Company, Inc. and Subsidiaries              
Long-term debt              
Total long-term debt   1,326,546,000 1,286,546,000        
Aggregate principal payments              
Proceeds from issuance of long-term debt   40,000,000 80,000,000 $ 0      
Electric utility              
Aggregate principal payments              
2017   0          
2018   50,000,000          
2019   0          
2020   96,000,000          
2021   0          
Special purpose revenue bonds issued on behalf of electric utility subsidiaries              
Long-term debt              
Total long-term debt   1,319,260,000 1,278,702,000        
Term loan | HEI Term loan LIBOR .75%, due 2017              
Long-term debt              
Total long-term debt   $ 125,000,000 $ 125,000,000        
Term loan | HEI Term loan LIBOR .75%, due 2017 | LIBOR              
Aggregate principal payments              
Line of credit facility basis point spread (as a percent)   0.75% 0.75%        
Term loan | HEI term loan LIBOR .75%, due 2018              
Long-term debt              
Total long-term debt   $ 75,000,000 $ 0        
Term loan | HEI term loan LIBOR .75%, due 2018 | LIBOR              
Aggregate principal payments              
Line of credit facility basis point spread (as a percent)   0.75% 0.75%        
Senior notes | HEI senior note 4.41%, paid 2016              
Long-term debt              
Total long-term debt   $ 0 $ 75,000,000        
Aggregate principal payments              
Debt instrument, stated interest rate (as a percent)   4.41% 4.41%        
Senior notes | HEI senior note 5.67%, due 2021              
Long-term debt              
Total long-term debt   $ 50,000,000 $ 50,000,000        
Aggregate principal payments              
Debt instrument, stated interest rate (as a percent)   5.67% 5.67%        
Senior notes | HEI senior note 3.99%, due 2023              
Long-term debt              
Total long-term debt   $ 50,000,000 $ 50,000,000        
Aggregate principal payments              
Debt instrument, stated interest rate (as a percent)   3.99% 3.99%        
Senior notes | Senior Notes, 4.41%              
Aggregate principal payments              
Debt instrument, stated interest rate (as a percent)           4.41%  
Line of credit facility | Bank of American Term Loan              
Aggregate principal payments              
Debt instrument, face amount $ 75,000,000         $ 75,000,000 $ 75,000,000
Line of credit facility | Eurodollar Term Loan              
Aggregate principal payments              
Initial interest rate (as a percent) 1.18%            
Subsequent interest rate (as a percent) 1.25%            
Unsecured Debt | Hawaiian Electric, 5.23%, Series 2015A, due 2045              
Aggregate principal payments              
Debt instrument, face amount         $ 40,000,000    
Unsecured Debt | Hawaii Electric Light, 5.23%, Series 2015A, due 2045              
Aggregate principal payments              
Debt instrument, stated interest rate (as a percent)         4.54%